4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2010, 2012, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
37 #define DEBUG_SUBSYSTEM S_RPC
38 #include <obd_support.h>
39 #include <obd_class.h>
40 #include <lustre_net.h>
41 #include <lu_object.h>
42 #include <linux/lnet/types.h>
43 #include "ptlrpc_internal.h"
45 /* The following are visible and mutable through /sys/module/ptlrpc */
46 int test_req_buffer_pressure
= 0;
47 module_param(test_req_buffer_pressure
, int, 0444);
48 MODULE_PARM_DESC(test_req_buffer_pressure
, "set non-zero to put pressure on request buffer pools");
49 module_param(at_min
, int, 0644);
50 MODULE_PARM_DESC(at_min
, "Adaptive timeout minimum (sec)");
51 module_param(at_max
, int, 0644);
52 MODULE_PARM_DESC(at_max
, "Adaptive timeout maximum (sec)");
53 module_param(at_history
, int, 0644);
54 MODULE_PARM_DESC(at_history
,
55 "Adaptive timeouts remember the slowest event that took place within this period (sec)");
56 module_param(at_early_margin
, int, 0644);
57 MODULE_PARM_DESC(at_early_margin
, "How soon before an RPC deadline to send an early reply");
58 module_param(at_extra
, int, 0644);
59 MODULE_PARM_DESC(at_extra
, "How much extra time to give with each early reply");
63 static int ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part
*svcpt
);
64 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request
*req
);
65 static void ptlrpc_at_remove_timed(struct ptlrpc_request
*req
);
67 /** Holds a list of all PTLRPC services */
68 LIST_HEAD(ptlrpc_all_services
);
69 /** Used to protect the \e ptlrpc_all_services list */
70 struct mutex ptlrpc_all_services_mutex
;
72 struct ptlrpc_request_buffer_desc
*
73 ptlrpc_alloc_rqbd(struct ptlrpc_service_part
*svcpt
)
75 struct ptlrpc_service
*svc
= svcpt
->scp_service
;
76 struct ptlrpc_request_buffer_desc
*rqbd
;
78 OBD_CPT_ALLOC_PTR(rqbd
, svc
->srv_cptable
, svcpt
->scp_cpt
);
82 rqbd
->rqbd_svcpt
= svcpt
;
83 rqbd
->rqbd_refcount
= 0;
84 rqbd
->rqbd_cbid
.cbid_fn
= request_in_callback
;
85 rqbd
->rqbd_cbid
.cbid_arg
= rqbd
;
86 INIT_LIST_HEAD(&rqbd
->rqbd_reqs
);
87 OBD_CPT_ALLOC_LARGE(rqbd
->rqbd_buffer
, svc
->srv_cptable
,
88 svcpt
->scp_cpt
, svc
->srv_buf_size
);
89 if (rqbd
->rqbd_buffer
== NULL
) {
94 spin_lock(&svcpt
->scp_lock
);
95 list_add(&rqbd
->rqbd_list
, &svcpt
->scp_rqbd_idle
);
96 svcpt
->scp_nrqbds_total
++;
97 spin_unlock(&svcpt
->scp_lock
);
103 ptlrpc_free_rqbd(struct ptlrpc_request_buffer_desc
*rqbd
)
105 struct ptlrpc_service_part
*svcpt
= rqbd
->rqbd_svcpt
;
107 LASSERT(rqbd
->rqbd_refcount
== 0);
108 LASSERT(list_empty(&rqbd
->rqbd_reqs
));
110 spin_lock(&svcpt
->scp_lock
);
111 list_del(&rqbd
->rqbd_list
);
112 svcpt
->scp_nrqbds_total
--;
113 spin_unlock(&svcpt
->scp_lock
);
115 OBD_FREE_LARGE(rqbd
->rqbd_buffer
, svcpt
->scp_service
->srv_buf_size
);
120 ptlrpc_grow_req_bufs(struct ptlrpc_service_part
*svcpt
, int post
)
122 struct ptlrpc_service
*svc
= svcpt
->scp_service
;
123 struct ptlrpc_request_buffer_desc
*rqbd
;
127 if (svcpt
->scp_rqbd_allocating
)
130 spin_lock(&svcpt
->scp_lock
);
131 /* check again with lock */
132 if (svcpt
->scp_rqbd_allocating
) {
133 /* NB: we might allow more than one thread in the future */
134 LASSERT(svcpt
->scp_rqbd_allocating
== 1);
135 spin_unlock(&svcpt
->scp_lock
);
139 svcpt
->scp_rqbd_allocating
++;
140 spin_unlock(&svcpt
->scp_lock
);
143 for (i
= 0; i
< svc
->srv_nbuf_per_group
; i
++) {
144 /* NB: another thread might have recycled enough rqbds, we
145 * need to make sure it wouldn't over-allocate, see LU-1212. */
146 if (svcpt
->scp_nrqbds_posted
>= svc
->srv_nbuf_per_group
)
149 rqbd
= ptlrpc_alloc_rqbd(svcpt
);
152 CERROR("%s: Can't allocate request buffer\n",
159 spin_lock(&svcpt
->scp_lock
);
161 LASSERT(svcpt
->scp_rqbd_allocating
== 1);
162 svcpt
->scp_rqbd_allocating
--;
164 spin_unlock(&svcpt
->scp_lock
);
167 "%s: allocate %d new %d-byte reqbufs (%d/%d left), rc = %d\n",
168 svc
->srv_name
, i
, svc
->srv_buf_size
, svcpt
->scp_nrqbds_posted
,
169 svcpt
->scp_nrqbds_total
, rc
);
173 rc
= ptlrpc_server_post_idle_rqbds(svcpt
);
179 * Part of Rep-Ack logic.
180 * Puts a lock and its mode into reply state assotiated to request reply.
183 ptlrpc_save_lock(struct ptlrpc_request
*req
,
184 struct lustre_handle
*lock
, int mode
, int no_ack
)
186 struct ptlrpc_reply_state
*rs
= req
->rq_reply_state
;
190 LASSERT(rs
->rs_nlocks
< RS_MAX_LOCKS
);
192 if (req
->rq_export
->exp_disconnected
) {
193 ldlm_lock_decref(lock
, mode
);
195 idx
= rs
->rs_nlocks
++;
196 rs
->rs_locks
[idx
] = *lock
;
197 rs
->rs_modes
[idx
] = mode
;
198 rs
->rs_difficult
= 1;
199 rs
->rs_no_ack
= !!no_ack
;
202 EXPORT_SYMBOL(ptlrpc_save_lock
);
205 struct ptlrpc_hr_partition
;
207 struct ptlrpc_hr_thread
{
208 int hrt_id
; /* thread ID */
210 wait_queue_head_t hrt_waitq
;
211 struct list_head hrt_queue
; /* RS queue */
212 struct ptlrpc_hr_partition
*hrt_partition
;
215 struct ptlrpc_hr_partition
{
216 /* # of started threads */
217 atomic_t hrp_nstarted
;
218 /* # of stopped threads */
219 atomic_t hrp_nstopped
;
220 /* cpu partition id */
222 /* round-robin rotor for choosing thread */
224 /* total number of threads on this partition */
227 struct ptlrpc_hr_thread
*hrp_thrs
;
230 #define HRT_RUNNING 0
231 #define HRT_STOPPING 1
233 struct ptlrpc_hr_service
{
234 /* CPU partition table, it's just cfs_cpt_table for now */
235 struct cfs_cpt_table
*hr_cpt_table
;
236 /** controller sleep waitq */
237 wait_queue_head_t hr_waitq
;
238 unsigned int hr_stopping
;
239 /** roundrobin rotor for non-affinity service */
240 unsigned int hr_rotor
;
242 struct ptlrpc_hr_partition
**hr_partitions
;
246 struct list_head rsb_replies
;
247 unsigned int rsb_n_replies
;
248 struct ptlrpc_service_part
*rsb_svcpt
;
251 /** reply handling service. */
252 static struct ptlrpc_hr_service ptlrpc_hr
;
255 * maximum mumber of replies scheduled in one batch
257 #define MAX_SCHEDULED 256
260 * Initialize a reply batch.
264 static void rs_batch_init(struct rs_batch
*b
)
266 memset(b
, 0, sizeof(*b
));
267 INIT_LIST_HEAD(&b
->rsb_replies
);
271 * Choose an hr thread to dispatch requests to.
273 static struct ptlrpc_hr_thread
*
274 ptlrpc_hr_select(struct ptlrpc_service_part
*svcpt
)
276 struct ptlrpc_hr_partition
*hrp
;
279 if (svcpt
->scp_cpt
>= 0 &&
280 svcpt
->scp_service
->srv_cptable
== ptlrpc_hr
.hr_cpt_table
) {
281 /* directly match partition */
282 hrp
= ptlrpc_hr
.hr_partitions
[svcpt
->scp_cpt
];
285 rotor
= ptlrpc_hr
.hr_rotor
++;
286 rotor
%= cfs_cpt_number(ptlrpc_hr
.hr_cpt_table
);
288 hrp
= ptlrpc_hr
.hr_partitions
[rotor
];
291 rotor
= hrp
->hrp_rotor
++;
292 return &hrp
->hrp_thrs
[rotor
% hrp
->hrp_nthrs
];
296 * Dispatch all replies accumulated in the batch to one from
297 * dedicated reply handling threads.
301 static void rs_batch_dispatch(struct rs_batch
*b
)
303 if (b
->rsb_n_replies
!= 0) {
304 struct ptlrpc_hr_thread
*hrt
;
306 hrt
= ptlrpc_hr_select(b
->rsb_svcpt
);
308 spin_lock(&hrt
->hrt_lock
);
309 list_splice_init(&b
->rsb_replies
, &hrt
->hrt_queue
);
310 spin_unlock(&hrt
->hrt_lock
);
312 wake_up(&hrt
->hrt_waitq
);
313 b
->rsb_n_replies
= 0;
318 * Add a reply to a batch.
319 * Add one reply object to a batch, schedule batched replies if overload.
324 static void rs_batch_add(struct rs_batch
*b
, struct ptlrpc_reply_state
*rs
)
326 struct ptlrpc_service_part
*svcpt
= rs
->rs_svcpt
;
328 if (svcpt
!= b
->rsb_svcpt
|| b
->rsb_n_replies
>= MAX_SCHEDULED
) {
329 if (b
->rsb_svcpt
!= NULL
) {
330 rs_batch_dispatch(b
);
331 spin_unlock(&b
->rsb_svcpt
->scp_rep_lock
);
333 spin_lock(&svcpt
->scp_rep_lock
);
334 b
->rsb_svcpt
= svcpt
;
336 spin_lock(&rs
->rs_lock
);
337 rs
->rs_scheduled_ever
= 1;
338 if (rs
->rs_scheduled
== 0) {
339 list_move(&rs
->rs_list
, &b
->rsb_replies
);
340 rs
->rs_scheduled
= 1;
343 rs
->rs_committed
= 1;
344 spin_unlock(&rs
->rs_lock
);
348 * Reply batch finalization.
349 * Dispatch remaining replies from the batch
350 * and release remaining spinlock.
354 static void rs_batch_fini(struct rs_batch
*b
)
356 if (b
->rsb_svcpt
!= NULL
) {
357 rs_batch_dispatch(b
);
358 spin_unlock(&b
->rsb_svcpt
->scp_rep_lock
);
362 #define DECLARE_RS_BATCH(b) struct rs_batch b
366 * Put reply state into a queue for processing because we received
367 * ACK from the client
369 void ptlrpc_dispatch_difficult_reply(struct ptlrpc_reply_state
*rs
)
371 struct ptlrpc_hr_thread
*hrt
;
373 LASSERT(list_empty(&rs
->rs_list
));
375 hrt
= ptlrpc_hr_select(rs
->rs_svcpt
);
377 spin_lock(&hrt
->hrt_lock
);
378 list_add_tail(&rs
->rs_list
, &hrt
->hrt_queue
);
379 spin_unlock(&hrt
->hrt_lock
);
381 wake_up(&hrt
->hrt_waitq
);
385 ptlrpc_schedule_difficult_reply(struct ptlrpc_reply_state
*rs
)
387 LASSERT(spin_is_locked(&rs
->rs_svcpt
->scp_rep_lock
));
388 LASSERT(spin_is_locked(&rs
->rs_lock
));
389 LASSERT(rs
->rs_difficult
);
390 rs
->rs_scheduled_ever
= 1; /* flag any notification attempt */
392 if (rs
->rs_scheduled
) { /* being set up or already notified */
396 rs
->rs_scheduled
= 1;
397 list_del_init(&rs
->rs_list
);
398 ptlrpc_dispatch_difficult_reply(rs
);
400 EXPORT_SYMBOL(ptlrpc_schedule_difficult_reply
);
402 void ptlrpc_commit_replies(struct obd_export
*exp
)
404 struct ptlrpc_reply_state
*rs
, *nxt
;
405 DECLARE_RS_BATCH(batch
);
407 rs_batch_init(&batch
);
408 /* Find any replies that have been committed and get their service
409 * to attend to complete them. */
411 /* CAVEAT EMPTOR: spinlock ordering!!! */
412 spin_lock(&exp
->exp_uncommitted_replies_lock
);
413 list_for_each_entry_safe(rs
, nxt
, &exp
->exp_uncommitted_replies
,
415 LASSERT(rs
->rs_difficult
);
416 /* VBR: per-export last_committed */
417 LASSERT(rs
->rs_export
);
418 if (rs
->rs_transno
<= exp
->exp_last_committed
) {
419 list_del_init(&rs
->rs_obd_list
);
420 rs_batch_add(&batch
, rs
);
423 spin_unlock(&exp
->exp_uncommitted_replies_lock
);
424 rs_batch_fini(&batch
);
426 EXPORT_SYMBOL(ptlrpc_commit_replies
);
429 ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part
*svcpt
)
431 struct ptlrpc_request_buffer_desc
*rqbd
;
436 spin_lock(&svcpt
->scp_lock
);
438 if (list_empty(&svcpt
->scp_rqbd_idle
)) {
439 spin_unlock(&svcpt
->scp_lock
);
443 rqbd
= list_entry(svcpt
->scp_rqbd_idle
.next
,
444 struct ptlrpc_request_buffer_desc
,
446 list_del(&rqbd
->rqbd_list
);
448 /* assume we will post successfully */
449 svcpt
->scp_nrqbds_posted
++;
450 list_add(&rqbd
->rqbd_list
, &svcpt
->scp_rqbd_posted
);
452 spin_unlock(&svcpt
->scp_lock
);
454 rc
= ptlrpc_register_rqbd(rqbd
);
461 spin_lock(&svcpt
->scp_lock
);
463 svcpt
->scp_nrqbds_posted
--;
464 list_del(&rqbd
->rqbd_list
);
465 list_add_tail(&rqbd
->rqbd_list
, &svcpt
->scp_rqbd_idle
);
467 /* Don't complain if no request buffers are posted right now; LNET
468 * won't drop requests because we set the portal lazy! */
470 spin_unlock(&svcpt
->scp_lock
);
475 static void ptlrpc_at_timer(unsigned long castmeharder
)
477 struct ptlrpc_service_part
*svcpt
;
479 svcpt
= (struct ptlrpc_service_part
*)castmeharder
;
481 svcpt
->scp_at_check
= 1;
482 svcpt
->scp_at_checktime
= cfs_time_current();
483 wake_up(&svcpt
->scp_waitq
);
487 ptlrpc_server_nthreads_check(struct ptlrpc_service
*svc
,
488 struct ptlrpc_service_conf
*conf
)
490 struct ptlrpc_service_thr_conf
*tc
= &conf
->psc_thr
;
497 * Common code for estimating & validating threads number.
498 * CPT affinity service could have percpt thread-pool instead
499 * of a global thread-pool, which means user might not always
500 * get the threads number they give it in conf::tc_nthrs_user
501 * even they did set. It's because we need to validate threads
502 * number for each CPT to guarantee each pool will have enough
503 * threads to keep the service healthy.
505 init
= PTLRPC_NTHRS_INIT
+ (svc
->srv_ops
.so_hpreq_handler
!= NULL
);
506 init
= max_t(int, init
, tc
->tc_nthrs_init
);
508 /* NB: please see comments in lustre_lnet.h for definition
509 * details of these members */
510 LASSERT(tc
->tc_nthrs_max
!= 0);
512 if (tc
->tc_nthrs_user
!= 0) {
513 /* In case there is a reason to test a service with many
514 * threads, we give a less strict check here, it can
515 * be up to 8 * nthrs_max */
516 total
= min(tc
->tc_nthrs_max
* 8, tc
->tc_nthrs_user
);
517 nthrs
= total
/ svc
->srv_ncpts
;
518 init
= max(init
, nthrs
);
522 total
= tc
->tc_nthrs_max
;
523 if (tc
->tc_nthrs_base
== 0) {
524 /* don't care about base threads number per partition,
525 * this is most for non-affinity service */
526 nthrs
= total
/ svc
->srv_ncpts
;
530 nthrs
= tc
->tc_nthrs_base
;
531 if (svc
->srv_ncpts
== 1) {
534 /* NB: Increase the base number if it's single partition
535 * and total number of cores/HTs is larger or equal to 4.
536 * result will always < 2 * nthrs_base */
537 weight
= cfs_cpt_weight(svc
->srv_cptable
, CFS_CPT_ANY
);
538 for (i
= 1; (weight
>> (i
+ 1)) != 0 && /* >= 4 cores/HTs */
539 (tc
->tc_nthrs_base
>> i
) != 0; i
++)
540 nthrs
+= tc
->tc_nthrs_base
>> i
;
543 if (tc
->tc_thr_factor
!= 0) {
544 int factor
= tc
->tc_thr_factor
;
549 * User wants to increase number of threads with for
550 * each CPU core/HT, most likely the factor is larger then
551 * one thread/core because service threads are supposed to
552 * be blocked by lock or wait for IO.
555 * Amdahl's law says that adding processors wouldn't give
556 * a linear increasing of parallelism, so it's nonsense to
557 * have too many threads no matter how many cores/HTs
560 cpumask_copy(&mask
, topology_thread_cpumask(0));
561 if (cpus_weight(mask
) > 1) { /* weight is # of HTs */
562 /* depress thread factor for hyper-thread */
563 factor
= factor
- (factor
>> 1) + (factor
>> 3);
566 weight
= cfs_cpt_weight(svc
->srv_cptable
, 0);
569 for (; factor
> 0 && weight
> 0; factor
--, weight
-= fade
)
570 nthrs
+= min(weight
, fade
) * factor
;
573 if (nthrs
* svc
->srv_ncpts
> tc
->tc_nthrs_max
) {
574 nthrs
= max(tc
->tc_nthrs_base
,
575 tc
->tc_nthrs_max
/ svc
->srv_ncpts
);
578 nthrs
= max(nthrs
, tc
->tc_nthrs_init
);
579 svc
->srv_nthrs_cpt_limit
= nthrs
;
580 svc
->srv_nthrs_cpt_init
= init
;
582 if (nthrs
* svc
->srv_ncpts
> tc
->tc_nthrs_max
) {
583 CDEBUG(D_OTHER
, "%s: This service may have more threads (%d) "
584 "than the given soft limit (%d)\n",
585 svc
->srv_name
, nthrs
* svc
->srv_ncpts
,
591 * Initialize percpt data for a service
594 ptlrpc_service_part_init(struct ptlrpc_service
*svc
,
595 struct ptlrpc_service_part
*svcpt
, int cpt
)
597 struct ptlrpc_at_array
*array
;
602 svcpt
->scp_cpt
= cpt
;
603 INIT_LIST_HEAD(&svcpt
->scp_threads
);
605 /* rqbd and incoming request queue */
606 spin_lock_init(&svcpt
->scp_lock
);
607 INIT_LIST_HEAD(&svcpt
->scp_rqbd_idle
);
608 INIT_LIST_HEAD(&svcpt
->scp_rqbd_posted
);
609 INIT_LIST_HEAD(&svcpt
->scp_req_incoming
);
610 init_waitqueue_head(&svcpt
->scp_waitq
);
611 /* history request & rqbd list */
612 INIT_LIST_HEAD(&svcpt
->scp_hist_reqs
);
613 INIT_LIST_HEAD(&svcpt
->scp_hist_rqbds
);
615 /* acitve requests and hp requests */
616 spin_lock_init(&svcpt
->scp_req_lock
);
619 spin_lock_init(&svcpt
->scp_rep_lock
);
620 INIT_LIST_HEAD(&svcpt
->scp_rep_active
);
621 INIT_LIST_HEAD(&svcpt
->scp_rep_idle
);
622 init_waitqueue_head(&svcpt
->scp_rep_waitq
);
623 atomic_set(&svcpt
->scp_nreps_difficult
, 0);
625 /* adaptive timeout */
626 spin_lock_init(&svcpt
->scp_at_lock
);
627 array
= &svcpt
->scp_at_array
;
629 size
= at_est2timeout(at_max
);
630 array
->paa_size
= size
;
631 array
->paa_count
= 0;
632 array
->paa_deadline
= -1;
634 /* allocate memory for scp_at_array (ptlrpc_at_array) */
635 OBD_CPT_ALLOC(array
->paa_reqs_array
,
636 svc
->srv_cptable
, cpt
, sizeof(struct list_head
) * size
);
637 if (array
->paa_reqs_array
== NULL
)
640 for (index
= 0; index
< size
; index
++)
641 INIT_LIST_HEAD(&array
->paa_reqs_array
[index
]);
643 OBD_CPT_ALLOC(array
->paa_reqs_count
,
644 svc
->srv_cptable
, cpt
, sizeof(__u32
) * size
);
645 if (array
->paa_reqs_count
== NULL
)
648 cfs_timer_init(&svcpt
->scp_at_timer
, ptlrpc_at_timer
, svcpt
);
649 /* At SOW, service time should be quick; 10s seems generous. If client
650 * timeout is less than this, we'll be sending an early reply. */
651 at_init(&svcpt
->scp_at_estimate
, 10, 0);
653 /* assign this before call ptlrpc_grow_req_bufs */
654 svcpt
->scp_service
= svc
;
655 /* Now allocate the request buffers, but don't post them now */
656 rc
= ptlrpc_grow_req_bufs(svcpt
, 0);
657 /* We shouldn't be under memory pressure at startup, so
658 * fail if we can't allocate all our buffers at this time. */
665 if (array
->paa_reqs_count
!= NULL
) {
666 OBD_FREE(array
->paa_reqs_count
, sizeof(__u32
) * size
);
667 array
->paa_reqs_count
= NULL
;
670 if (array
->paa_reqs_array
!= NULL
) {
671 OBD_FREE(array
->paa_reqs_array
,
672 sizeof(struct list_head
) * array
->paa_size
);
673 array
->paa_reqs_array
= NULL
;
680 * Initialize service on a given portal.
681 * This includes starting serving threads , allocating and posting rqbds and
684 struct ptlrpc_service
*
685 ptlrpc_register_service(struct ptlrpc_service_conf
*conf
,
686 struct proc_dir_entry
*proc_entry
)
688 struct ptlrpc_service_cpt_conf
*cconf
= &conf
->psc_cpt
;
689 struct ptlrpc_service
*service
;
690 struct ptlrpc_service_part
*svcpt
;
691 struct cfs_cpt_table
*cptable
;
698 LASSERT(conf
->psc_buf
.bc_nbufs
> 0);
699 LASSERT(conf
->psc_buf
.bc_buf_size
>=
700 conf
->psc_buf
.bc_req_max_size
+ SPTLRPC_MAX_PAYLOAD
);
701 LASSERT(conf
->psc_thr
.tc_ctx_tags
!= 0);
703 cptable
= cconf
->cc_cptable
;
705 cptable
= cfs_cpt_table
;
707 if (!conf
->psc_thr
.tc_cpu_affinity
) {
710 ncpts
= cfs_cpt_number(cptable
);
711 if (cconf
->cc_pattern
!= NULL
) {
712 struct cfs_expr_list
*el
;
714 rc
= cfs_expr_list_parse(cconf
->cc_pattern
,
715 strlen(cconf
->cc_pattern
),
718 CERROR("%s: invalid CPT pattern string: %s",
719 conf
->psc_name
, cconf
->cc_pattern
);
720 return ERR_PTR(-EINVAL
);
723 rc
= cfs_expr_list_values(el
, ncpts
, &cpts
);
724 cfs_expr_list_free(el
);
726 CERROR("%s: failed to parse CPT array %s: %d\n",
727 conf
->psc_name
, cconf
->cc_pattern
, rc
);
729 OBD_FREE(cpts
, sizeof(*cpts
) * ncpts
);
730 return ERR_PTR(rc
< 0 ? rc
: -EINVAL
);
736 OBD_ALLOC(service
, offsetof(struct ptlrpc_service
, srv_parts
[ncpts
]));
737 if (service
== NULL
) {
739 OBD_FREE(cpts
, sizeof(*cpts
) * ncpts
);
740 return ERR_PTR(-ENOMEM
);
743 service
->srv_cptable
= cptable
;
744 service
->srv_cpts
= cpts
;
745 service
->srv_ncpts
= ncpts
;
747 service
->srv_cpt_bits
= 0; /* it's zero already, easy to read... */
748 while ((1 << service
->srv_cpt_bits
) < cfs_cpt_number(cptable
))
749 service
->srv_cpt_bits
++;
752 spin_lock_init(&service
->srv_lock
);
753 service
->srv_name
= conf
->psc_name
;
754 service
->srv_watchdog_factor
= conf
->psc_watchdog_factor
;
755 INIT_LIST_HEAD(&service
->srv_list
); /* for safty of cleanup */
757 /* buffer configuration */
758 service
->srv_nbuf_per_group
= test_req_buffer_pressure
?
759 1 : conf
->psc_buf
.bc_nbufs
;
760 service
->srv_max_req_size
= conf
->psc_buf
.bc_req_max_size
+
762 service
->srv_buf_size
= conf
->psc_buf
.bc_buf_size
;
763 service
->srv_rep_portal
= conf
->psc_buf
.bc_rep_portal
;
764 service
->srv_req_portal
= conf
->psc_buf
.bc_req_portal
;
766 /* Increase max reply size to next power of two */
767 service
->srv_max_reply_size
= 1;
768 while (service
->srv_max_reply_size
<
769 conf
->psc_buf
.bc_rep_max_size
+ SPTLRPC_MAX_PAYLOAD
)
770 service
->srv_max_reply_size
<<= 1;
772 service
->srv_thread_name
= conf
->psc_thr
.tc_thr_name
;
773 service
->srv_ctx_tags
= conf
->psc_thr
.tc_ctx_tags
;
774 service
->srv_hpreq_ratio
= PTLRPC_SVC_HP_RATIO
;
775 service
->srv_ops
= conf
->psc_ops
;
777 for (i
= 0; i
< ncpts
; i
++) {
778 if (!conf
->psc_thr
.tc_cpu_affinity
)
781 cpt
= cpts
!= NULL
? cpts
[i
] : i
;
783 OBD_CPT_ALLOC(svcpt
, cptable
, cpt
, sizeof(*svcpt
));
785 GOTO(failed
, rc
= -ENOMEM
);
787 service
->srv_parts
[i
] = svcpt
;
788 rc
= ptlrpc_service_part_init(service
, svcpt
, cpt
);
793 ptlrpc_server_nthreads_check(service
, conf
);
795 rc
= LNetSetLazyPortal(service
->srv_req_portal
);
798 mutex_lock(&ptlrpc_all_services_mutex
);
799 list_add(&service
->srv_list
, &ptlrpc_all_services
);
800 mutex_unlock(&ptlrpc_all_services_mutex
);
802 if (proc_entry
!= NULL
)
803 ptlrpc_lprocfs_register_service(proc_entry
, service
);
805 rc
= ptlrpc_service_nrs_setup(service
);
809 CDEBUG(D_NET
, "%s: Started, listening on portal %d\n",
810 service
->srv_name
, service
->srv_req_portal
);
812 rc
= ptlrpc_start_threads(service
);
814 CERROR("Failed to start threads for service %s: %d\n",
815 service
->srv_name
, rc
);
821 ptlrpc_unregister_service(service
);
824 EXPORT_SYMBOL(ptlrpc_register_service
);
827 * to actually free the request, must be called without holding svc_lock.
828 * note it's caller's responsibility to unlink req->rq_list.
830 static void ptlrpc_server_free_request(struct ptlrpc_request
*req
)
832 LASSERT(atomic_read(&req
->rq_refcount
) == 0);
833 LASSERT(list_empty(&req
->rq_timed_list
));
835 /* DEBUG_REQ() assumes the reply state of a request with a valid
836 * ref will not be destroyed until that reference is dropped. */
837 ptlrpc_req_drop_rs(req
);
839 sptlrpc_svc_ctx_decref(req
);
841 if (req
!= &req
->rq_rqbd
->rqbd_req
) {
842 /* NB request buffers use an embedded
843 * req if the incoming req unlinked the
844 * MD; this isn't one of them! */
845 OBD_FREE(req
, sizeof(*req
));
850 * drop a reference count of the request. if it reaches 0, we either
851 * put it into history list, or free it immediately.
853 void ptlrpc_server_drop_request(struct ptlrpc_request
*req
)
855 struct ptlrpc_request_buffer_desc
*rqbd
= req
->rq_rqbd
;
856 struct ptlrpc_service_part
*svcpt
= rqbd
->rqbd_svcpt
;
857 struct ptlrpc_service
*svc
= svcpt
->scp_service
;
859 struct list_head
*tmp
;
860 struct list_head
*nxt
;
862 if (!atomic_dec_and_test(&req
->rq_refcount
))
865 if (req
->rq_at_linked
) {
866 spin_lock(&svcpt
->scp_at_lock
);
867 /* recheck with lock, in case it's unlinked by
868 * ptlrpc_at_check_timed() */
869 if (likely(req
->rq_at_linked
))
870 ptlrpc_at_remove_timed(req
);
871 spin_unlock(&svcpt
->scp_at_lock
);
874 LASSERT(list_empty(&req
->rq_timed_list
));
876 /* finalize request */
877 if (req
->rq_export
) {
878 class_export_put(req
->rq_export
);
879 req
->rq_export
= NULL
;
882 spin_lock(&svcpt
->scp_lock
);
884 list_add(&req
->rq_list
, &rqbd
->rqbd_reqs
);
886 refcount
= --(rqbd
->rqbd_refcount
);
888 /* request buffer is now idle: add to history */
889 list_del(&rqbd
->rqbd_list
);
891 list_add_tail(&rqbd
->rqbd_list
, &svcpt
->scp_hist_rqbds
);
892 svcpt
->scp_hist_nrqbds
++;
894 /* cull some history?
895 * I expect only about 1 or 2 rqbds need to be recycled here */
896 while (svcpt
->scp_hist_nrqbds
> svc
->srv_hist_nrqbds_cpt_max
) {
897 rqbd
= list_entry(svcpt
->scp_hist_rqbds
.next
,
898 struct ptlrpc_request_buffer_desc
,
901 list_del(&rqbd
->rqbd_list
);
902 svcpt
->scp_hist_nrqbds
--;
904 /* remove rqbd's reqs from svc's req history while
905 * I've got the service lock */
906 list_for_each(tmp
, &rqbd
->rqbd_reqs
) {
907 req
= list_entry(tmp
, struct ptlrpc_request
,
909 /* Track the highest culled req seq */
910 if (req
->rq_history_seq
>
911 svcpt
->scp_hist_seq_culled
) {
912 svcpt
->scp_hist_seq_culled
=
915 list_del(&req
->rq_history_list
);
918 spin_unlock(&svcpt
->scp_lock
);
920 list_for_each_safe(tmp
, nxt
, &rqbd
->rqbd_reqs
) {
921 req
= list_entry(rqbd
->rqbd_reqs
.next
,
922 struct ptlrpc_request
,
924 list_del(&req
->rq_list
);
925 ptlrpc_server_free_request(req
);
928 spin_lock(&svcpt
->scp_lock
);
930 * now all reqs including the embedded req has been
931 * disposed, schedule request buffer for re-use.
933 LASSERT(atomic_read(&rqbd
->rqbd_req
.rq_refcount
) ==
935 list_add_tail(&rqbd
->rqbd_list
,
936 &svcpt
->scp_rqbd_idle
);
939 spin_unlock(&svcpt
->scp_lock
);
940 } else if (req
->rq_reply_state
&& req
->rq_reply_state
->rs_prealloc
) {
941 /* If we are low on memory, we are not interested in history */
942 list_del(&req
->rq_list
);
943 list_del_init(&req
->rq_history_list
);
945 /* Track the highest culled req seq */
946 if (req
->rq_history_seq
> svcpt
->scp_hist_seq_culled
)
947 svcpt
->scp_hist_seq_culled
= req
->rq_history_seq
;
949 spin_unlock(&svcpt
->scp_lock
);
951 ptlrpc_server_free_request(req
);
953 spin_unlock(&svcpt
->scp_lock
);
957 /** Change request export and move hp request from old export to new */
958 void ptlrpc_request_change_export(struct ptlrpc_request
*req
,
959 struct obd_export
*export
)
961 if (req
->rq_export
!= NULL
) {
962 if (!list_empty(&req
->rq_exp_list
)) {
963 /* remove rq_exp_list from last export */
964 spin_lock_bh(&req
->rq_export
->exp_rpc_lock
);
965 list_del_init(&req
->rq_exp_list
);
966 spin_unlock_bh(&req
->rq_export
->exp_rpc_lock
);
968 /* export has one reference already, so it`s safe to
969 * add req to export queue here and get another
970 * reference for request later */
971 spin_lock_bh(&export
->exp_rpc_lock
);
972 list_add(&req
->rq_exp_list
, &export
->exp_hp_rpcs
);
973 spin_unlock_bh(&export
->exp_rpc_lock
);
975 class_export_rpc_dec(req
->rq_export
);
976 class_export_put(req
->rq_export
);
979 /* request takes one export refcount */
980 req
->rq_export
= class_export_get(export
);
981 class_export_rpc_inc(export
);
987 * to finish a request: stop sending more early replies, and release
990 static void ptlrpc_server_finish_request(struct ptlrpc_service_part
*svcpt
,
991 struct ptlrpc_request
*req
)
993 ptlrpc_server_hpreq_fini(req
);
995 ptlrpc_server_drop_request(req
);
999 * to finish a active request: stop sending more early replies, and release
1000 * the request. should be called after we finished handling the request.
1002 static void ptlrpc_server_finish_active_request(
1003 struct ptlrpc_service_part
*svcpt
,
1004 struct ptlrpc_request
*req
)
1006 spin_lock(&svcpt
->scp_req_lock
);
1007 ptlrpc_nrs_req_stop_nolock(req
);
1008 svcpt
->scp_nreqs_active
--;
1010 svcpt
->scp_nhreqs_active
--;
1011 spin_unlock(&svcpt
->scp_req_lock
);
1013 ptlrpc_nrs_req_finalize(req
);
1015 if (req
->rq_export
!= NULL
)
1016 class_export_rpc_dec(req
->rq_export
);
1018 ptlrpc_server_finish_request(svcpt
, req
);
1022 * This function makes sure dead exports are evicted in a timely manner.
1023 * This function is only called when some export receives a message (i.e.,
1024 * the network is up.)
1026 static void ptlrpc_update_export_timer(struct obd_export
*exp
, long extra_delay
)
1028 struct obd_export
*oldest_exp
;
1029 time_t oldest_time
, new_time
;
1033 /* Compensate for slow machines, etc, by faking our request time
1034 into the future. Although this can break the strict time-ordering
1035 of the list, we can be really lazy here - we don't have to evict
1036 at the exact right moment. Eventually, all silent exports
1037 will make it to the top of the list. */
1039 /* Do not pay attention on 1sec or smaller renewals. */
1040 new_time
= cfs_time_current_sec() + extra_delay
;
1041 if (exp
->exp_last_request_time
+ 1 /*second */ >= new_time
)
1044 exp
->exp_last_request_time
= new_time
;
1045 CDEBUG(D_HA
, "updating export %s at "CFS_TIME_T
" exp %p\n",
1046 exp
->exp_client_uuid
.uuid
,
1047 exp
->exp_last_request_time
, exp
);
1049 /* exports may get disconnected from the chain even though the
1050 export has references, so we must keep the spin lock while
1051 manipulating the lists */
1052 spin_lock(&exp
->exp_obd
->obd_dev_lock
);
1054 if (list_empty(&exp
->exp_obd_chain_timed
)) {
1055 /* this one is not timed */
1056 spin_unlock(&exp
->exp_obd
->obd_dev_lock
);
1060 list_move_tail(&exp
->exp_obd_chain_timed
,
1061 &exp
->exp_obd
->obd_exports_timed
);
1063 oldest_exp
= list_entry(exp
->exp_obd
->obd_exports_timed
.next
,
1064 struct obd_export
, exp_obd_chain_timed
);
1065 oldest_time
= oldest_exp
->exp_last_request_time
;
1066 spin_unlock(&exp
->exp_obd
->obd_dev_lock
);
1068 if (exp
->exp_obd
->obd_recovering
) {
1069 /* be nice to everyone during recovery */
1073 /* Note - racing to start/reset the obd_eviction timer is safe */
1074 if (exp
->exp_obd
->obd_eviction_timer
== 0) {
1075 /* Check if the oldest entry is expired. */
1076 if (cfs_time_current_sec() > (oldest_time
+ PING_EVICT_TIMEOUT
+
1078 /* We need a second timer, in case the net was down and
1079 * it just came back. Since the pinger may skip every
1080 * other PING_INTERVAL (see note in ptlrpc_pinger_main),
1081 * we better wait for 3. */
1082 exp
->exp_obd
->obd_eviction_timer
=
1083 cfs_time_current_sec() + 3 * PING_INTERVAL
;
1084 CDEBUG(D_HA
, "%s: Think about evicting %s from "CFS_TIME_T
"\n",
1085 exp
->exp_obd
->obd_name
,
1086 obd_export_nid2str(oldest_exp
), oldest_time
);
1089 if (cfs_time_current_sec() >
1090 (exp
->exp_obd
->obd_eviction_timer
+ extra_delay
)) {
1091 /* The evictor won't evict anyone who we've heard from
1092 * recently, so we don't have to check before we start
1094 if (!ping_evictor_wake(exp
))
1095 exp
->exp_obd
->obd_eviction_timer
= 0;
1101 * Sanity check request \a req.
1102 * Return 0 if all is ok, error code otherwise.
1104 static int ptlrpc_check_req(struct ptlrpc_request
*req
)
1108 if (unlikely(lustre_msg_get_conn_cnt(req
->rq_reqmsg
) <
1109 req
->rq_export
->exp_conn_cnt
)) {
1110 DEBUG_REQ(D_RPCTRACE
, req
,
1111 "DROPPING req from old connection %d < %d",
1112 lustre_msg_get_conn_cnt(req
->rq_reqmsg
),
1113 req
->rq_export
->exp_conn_cnt
);
1116 if (unlikely(req
->rq_export
->exp_obd
&&
1117 req
->rq_export
->exp_obd
->obd_fail
)) {
1119 * Failing over, don't handle any more reqs, send
1120 * error response instead.
1122 CDEBUG(D_RPCTRACE
, "Dropping req %p for failed obd %s\n",
1123 req
, req
->rq_export
->exp_obd
->obd_name
);
1125 } else if (lustre_msg_get_flags(req
->rq_reqmsg
) &
1126 (MSG_REPLAY
| MSG_REQ_REPLAY_DONE
) &&
1127 !(req
->rq_export
->exp_obd
->obd_recovering
)) {
1128 DEBUG_REQ(D_ERROR
, req
,
1129 "Invalid replay without recovery");
1130 class_fail_export(req
->rq_export
);
1132 } else if (lustre_msg_get_transno(req
->rq_reqmsg
) != 0 &&
1133 !(req
->rq_export
->exp_obd
->obd_recovering
)) {
1134 DEBUG_REQ(D_ERROR
, req
, "Invalid req with transno "
1135 LPU64
" without recovery",
1136 lustre_msg_get_transno(req
->rq_reqmsg
));
1137 class_fail_export(req
->rq_export
);
1141 if (unlikely(rc
< 0)) {
1142 req
->rq_status
= rc
;
1148 static void ptlrpc_at_set_timer(struct ptlrpc_service_part
*svcpt
)
1150 struct ptlrpc_at_array
*array
= &svcpt
->scp_at_array
;
1153 if (array
->paa_count
== 0) {
1154 cfs_timer_disarm(&svcpt
->scp_at_timer
);
1158 /* Set timer for closest deadline */
1159 next
= (__s32
)(array
->paa_deadline
- cfs_time_current_sec() -
1162 ptlrpc_at_timer((unsigned long)svcpt
);
1164 cfs_timer_arm(&svcpt
->scp_at_timer
, cfs_time_shift(next
));
1165 CDEBUG(D_INFO
, "armed %s at %+ds\n",
1166 svcpt
->scp_service
->srv_name
, next
);
1170 /* Add rpc to early reply check list */
1171 static int ptlrpc_at_add_timed(struct ptlrpc_request
*req
)
1173 struct ptlrpc_service_part
*svcpt
= req
->rq_rqbd
->rqbd_svcpt
;
1174 struct ptlrpc_at_array
*array
= &svcpt
->scp_at_array
;
1175 struct ptlrpc_request
*rq
= NULL
;
1181 if (req
->rq_no_reply
)
1184 if ((lustre_msghdr_get_flags(req
->rq_reqmsg
) & MSGHDR_AT_SUPPORT
) == 0)
1187 spin_lock(&svcpt
->scp_at_lock
);
1188 LASSERT(list_empty(&req
->rq_timed_list
));
1190 index
= (unsigned long)req
->rq_deadline
% array
->paa_size
;
1191 if (array
->paa_reqs_count
[index
] > 0) {
1192 /* latest rpcs will have the latest deadlines in the list,
1193 * so search backward. */
1194 list_for_each_entry_reverse(rq
,
1195 &array
->paa_reqs_array
[index
],
1197 if (req
->rq_deadline
>= rq
->rq_deadline
) {
1198 list_add(&req
->rq_timed_list
,
1199 &rq
->rq_timed_list
);
1205 /* Add the request at the head of the list */
1206 if (list_empty(&req
->rq_timed_list
))
1207 list_add(&req
->rq_timed_list
,
1208 &array
->paa_reqs_array
[index
]);
1210 spin_lock(&req
->rq_lock
);
1211 req
->rq_at_linked
= 1;
1212 spin_unlock(&req
->rq_lock
);
1213 req
->rq_at_index
= index
;
1214 array
->paa_reqs_count
[index
]++;
1216 if (array
->paa_count
== 1 || array
->paa_deadline
> req
->rq_deadline
) {
1217 array
->paa_deadline
= req
->rq_deadline
;
1218 ptlrpc_at_set_timer(svcpt
);
1220 spin_unlock(&svcpt
->scp_at_lock
);
1226 ptlrpc_at_remove_timed(struct ptlrpc_request
*req
)
1228 struct ptlrpc_at_array
*array
;
1230 array
= &req
->rq_rqbd
->rqbd_svcpt
->scp_at_array
;
1232 /* NB: must call with hold svcpt::scp_at_lock */
1233 LASSERT(!list_empty(&req
->rq_timed_list
));
1234 list_del_init(&req
->rq_timed_list
);
1236 spin_lock(&req
->rq_lock
);
1237 req
->rq_at_linked
= 0;
1238 spin_unlock(&req
->rq_lock
);
1240 array
->paa_reqs_count
[req
->rq_at_index
]--;
1244 static int ptlrpc_at_send_early_reply(struct ptlrpc_request
*req
)
1246 struct ptlrpc_service_part
*svcpt
= req
->rq_rqbd
->rqbd_svcpt
;
1247 struct ptlrpc_request
*reqcopy
;
1248 struct lustre_msg
*reqmsg
;
1249 cfs_duration_t olddl
= req
->rq_deadline
- cfs_time_current_sec();
1253 /* deadline is when the client expects us to reply, margin is the
1254 difference between clients' and servers' expectations */
1255 DEBUG_REQ(D_ADAPTTO
, req
,
1256 "%ssending early reply (deadline %+lds, margin %+lds) for "
1257 "%d+%d", AT_OFF
? "AT off - not " : "",
1258 olddl
, olddl
- at_get(&svcpt
->scp_at_estimate
),
1259 at_get(&svcpt
->scp_at_estimate
), at_extra
);
1265 DEBUG_REQ(D_WARNING
, req
, "Already past deadline (%+lds), "
1266 "not sending early reply. Consider increasing "
1267 "at_early_margin (%d)?", olddl
, at_early_margin
);
1269 /* Return an error so we're not re-added to the timed list. */
1273 if (!(lustre_msghdr_get_flags(req
->rq_reqmsg
) & MSGHDR_AT_SUPPORT
)) {
1274 DEBUG_REQ(D_INFO
, req
, "Wanted to ask client for more time, "
1275 "but no AT support");
1279 if (req
->rq_export
&&
1280 lustre_msg_get_flags(req
->rq_reqmsg
) &
1281 (MSG_REPLAY
| MSG_REQ_REPLAY_DONE
| MSG_LOCK_REPLAY_DONE
)) {
1282 /* During recovery, we don't want to send too many early
1283 * replies, but on the other hand we want to make sure the
1284 * client has enough time to resend if the rpc is lost. So
1285 * during the recovery period send at least 4 early replies,
1286 * spacing them every at_extra if we can. at_estimate should
1287 * always equal this fixed value during recovery. */
1288 at_measured(&svcpt
->scp_at_estimate
, min(at_extra
,
1289 req
->rq_export
->exp_obd
->obd_recovery_timeout
/ 4));
1291 /* Fake our processing time into the future to ask the clients
1292 * for some extra amount of time */
1293 at_measured(&svcpt
->scp_at_estimate
, at_extra
+
1294 cfs_time_current_sec() -
1295 req
->rq_arrival_time
.tv_sec
);
1297 /* Check to see if we've actually increased the deadline -
1298 * we may be past adaptive_max */
1299 if (req
->rq_deadline
>= req
->rq_arrival_time
.tv_sec
+
1300 at_get(&svcpt
->scp_at_estimate
)) {
1301 DEBUG_REQ(D_WARNING
, req
, "Couldn't add any time "
1302 "(%ld/%ld), not sending early reply\n",
1303 olddl
, req
->rq_arrival_time
.tv_sec
+
1304 at_get(&svcpt
->scp_at_estimate
) -
1305 cfs_time_current_sec());
1309 newdl
= cfs_time_current_sec() + at_get(&svcpt
->scp_at_estimate
);
1311 OBD_ALLOC(reqcopy
, sizeof(*reqcopy
));
1312 if (reqcopy
== NULL
)
1314 OBD_ALLOC_LARGE(reqmsg
, req
->rq_reqlen
);
1316 OBD_FREE(reqcopy
, sizeof(*reqcopy
));
1321 reqcopy
->rq_reply_state
= NULL
;
1322 reqcopy
->rq_rep_swab_mask
= 0;
1323 reqcopy
->rq_pack_bulk
= 0;
1324 reqcopy
->rq_pack_udesc
= 0;
1325 reqcopy
->rq_packed_final
= 0;
1326 sptlrpc_svc_ctx_addref(reqcopy
);
1327 /* We only need the reqmsg for the magic */
1328 reqcopy
->rq_reqmsg
= reqmsg
;
1329 memcpy(reqmsg
, req
->rq_reqmsg
, req
->rq_reqlen
);
1331 LASSERT(atomic_read(&req
->rq_refcount
));
1332 /** if it is last refcount then early reply isn't needed */
1333 if (atomic_read(&req
->rq_refcount
) == 1) {
1334 DEBUG_REQ(D_ADAPTTO
, reqcopy
, "Normal reply already sent out, "
1335 "abort sending early reply\n");
1336 GOTO(out
, rc
= -EINVAL
);
1339 /* Connection ref */
1340 reqcopy
->rq_export
= class_conn2export(
1341 lustre_msg_get_handle(reqcopy
->rq_reqmsg
));
1342 if (reqcopy
->rq_export
== NULL
)
1343 GOTO(out
, rc
= -ENODEV
);
1346 class_export_rpc_inc(reqcopy
->rq_export
);
1347 if (reqcopy
->rq_export
->exp_obd
&&
1348 reqcopy
->rq_export
->exp_obd
->obd_fail
)
1349 GOTO(out_put
, rc
= -ENODEV
);
1351 rc
= lustre_pack_reply_flags(reqcopy
, 1, NULL
, NULL
, LPRFL_EARLY_REPLY
);
1355 rc
= ptlrpc_send_reply(reqcopy
, PTLRPC_REPLY_EARLY
);
1358 /* Adjust our own deadline to what we told the client */
1359 req
->rq_deadline
= newdl
;
1360 req
->rq_early_count
++; /* number sent, server side */
1362 DEBUG_REQ(D_ERROR
, req
, "Early reply send failed %d", rc
);
1365 /* Free the (early) reply state from lustre_pack_reply.
1366 (ptlrpc_send_reply takes it's own rs ref, so this is safe here) */
1367 ptlrpc_req_drop_rs(reqcopy
);
1370 class_export_rpc_dec(reqcopy
->rq_export
);
1371 class_export_put(reqcopy
->rq_export
);
1373 sptlrpc_svc_ctx_decref(reqcopy
);
1374 OBD_FREE_LARGE(reqmsg
, req
->rq_reqlen
);
1375 OBD_FREE(reqcopy
, sizeof(*reqcopy
));
1379 /* Send early replies to everybody expiring within at_early_margin
1380 asking for at_extra time */
1381 static int ptlrpc_at_check_timed(struct ptlrpc_service_part
*svcpt
)
1383 struct ptlrpc_at_array
*array
= &svcpt
->scp_at_array
;
1384 struct ptlrpc_request
*rq
, *n
;
1385 struct list_head work_list
;
1388 time_t now
= cfs_time_current_sec();
1389 cfs_duration_t delay
;
1390 int first
, counter
= 0;
1392 spin_lock(&svcpt
->scp_at_lock
);
1393 if (svcpt
->scp_at_check
== 0) {
1394 spin_unlock(&svcpt
->scp_at_lock
);
1397 delay
= cfs_time_sub(cfs_time_current(), svcpt
->scp_at_checktime
);
1398 svcpt
->scp_at_check
= 0;
1400 if (array
->paa_count
== 0) {
1401 spin_unlock(&svcpt
->scp_at_lock
);
1405 /* The timer went off, but maybe the nearest rpc already completed. */
1406 first
= array
->paa_deadline
- now
;
1407 if (first
> at_early_margin
) {
1408 /* We've still got plenty of time. Reset the timer. */
1409 ptlrpc_at_set_timer(svcpt
);
1410 spin_unlock(&svcpt
->scp_at_lock
);
1414 /* We're close to a timeout, and we don't know how much longer the
1415 server will take. Send early replies to everyone expiring soon. */
1416 INIT_LIST_HEAD(&work_list
);
1418 index
= (unsigned long)array
->paa_deadline
% array
->paa_size
;
1419 count
= array
->paa_count
;
1421 count
-= array
->paa_reqs_count
[index
];
1422 list_for_each_entry_safe(rq
, n
,
1423 &array
->paa_reqs_array
[index
],
1425 if (rq
->rq_deadline
> now
+ at_early_margin
) {
1426 /* update the earliest deadline */
1427 if (deadline
== -1 ||
1428 rq
->rq_deadline
< deadline
)
1429 deadline
= rq
->rq_deadline
;
1433 ptlrpc_at_remove_timed(rq
);
1435 * ptlrpc_server_drop_request() may drop
1436 * refcount to 0 already. Let's check this and
1437 * don't add entry to work_list
1439 if (likely(atomic_inc_not_zero(&rq
->rq_refcount
)))
1440 list_add(&rq
->rq_timed_list
, &work_list
);
1444 if (++index
>= array
->paa_size
)
1447 array
->paa_deadline
= deadline
;
1448 /* we have a new earliest deadline, restart the timer */
1449 ptlrpc_at_set_timer(svcpt
);
1451 spin_unlock(&svcpt
->scp_at_lock
);
1453 CDEBUG(D_ADAPTTO
, "timeout in %+ds, asking for %d secs on %d early "
1454 "replies\n", first
, at_extra
, counter
);
1456 /* We're already past request deadlines before we even get a
1457 chance to send early replies */
1458 LCONSOLE_WARN("%s: This server is not able to keep up with "
1459 "request traffic (cpu-bound).\n",
1460 svcpt
->scp_service
->srv_name
);
1461 CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, "
1462 "delay="CFS_DURATION_T
"(jiff)\n",
1463 counter
, svcpt
->scp_nreqs_incoming
,
1464 svcpt
->scp_nreqs_active
,
1465 at_get(&svcpt
->scp_at_estimate
), delay
);
1468 /* we took additional refcount so entries can't be deleted from list, no
1469 * locking is needed */
1470 while (!list_empty(&work_list
)) {
1471 rq
= list_entry(work_list
.next
, struct ptlrpc_request
,
1473 list_del_init(&rq
->rq_timed_list
);
1475 if (ptlrpc_at_send_early_reply(rq
) == 0)
1476 ptlrpc_at_add_timed(rq
);
1478 ptlrpc_server_drop_request(rq
);
1481 return 1; /* return "did_something" for liblustre */
1485 * Put the request to the export list if the request may become
1486 * a high priority one.
1488 static int ptlrpc_server_hpreq_init(struct ptlrpc_service_part
*svcpt
,
1489 struct ptlrpc_request
*req
)
1493 if (svcpt
->scp_service
->srv_ops
.so_hpreq_handler
) {
1494 rc
= svcpt
->scp_service
->srv_ops
.so_hpreq_handler(req
);
1499 if (req
->rq_export
&& req
->rq_ops
) {
1500 /* Perform request specific check. We should do this check
1501 * before the request is added into exp_hp_rpcs list otherwise
1502 * it may hit swab race at LU-1044. */
1503 if (req
->rq_ops
->hpreq_check
) {
1504 rc
= req
->rq_ops
->hpreq_check(req
);
1506 * XXX: Out of all current
1507 * ptlrpc_hpreq_ops::hpreq_check(), only
1508 * ldlm_cancel_hpreq_check() can return an error code;
1509 * other functions assert in similar places, which seems
1510 * odd. What also does not seem right is that handlers
1511 * for those RPCs do not assert on the same checks, but
1512 * rather handle the error cases. e.g. see
1513 * ost_rw_hpreq_check(), and ost_brw_read(),
1518 LASSERT(rc
== 0 || rc
== 1);
1521 spin_lock_bh(&req
->rq_export
->exp_rpc_lock
);
1522 list_add(&req
->rq_exp_list
,
1523 &req
->rq_export
->exp_hp_rpcs
);
1524 spin_unlock_bh(&req
->rq_export
->exp_rpc_lock
);
1527 ptlrpc_nrs_req_initialize(svcpt
, req
, rc
);
1532 /** Remove the request from the export list. */
1533 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request
*req
)
1535 if (req
->rq_export
&& req
->rq_ops
) {
1536 /* refresh lock timeout again so that client has more
1537 * room to send lock cancel RPC. */
1538 if (req
->rq_ops
->hpreq_fini
)
1539 req
->rq_ops
->hpreq_fini(req
);
1541 spin_lock_bh(&req
->rq_export
->exp_rpc_lock
);
1542 list_del_init(&req
->rq_exp_list
);
1543 spin_unlock_bh(&req
->rq_export
->exp_rpc_lock
);
1547 static int ptlrpc_hpreq_check(struct ptlrpc_request
*req
)
1552 static struct ptlrpc_hpreq_ops ptlrpc_hpreq_common
= {
1553 .hpreq_check
= ptlrpc_hpreq_check
,
1556 /* Hi-Priority RPC check by RPC operation code. */
1557 int ptlrpc_hpreq_handler(struct ptlrpc_request
*req
)
1559 int opc
= lustre_msg_get_opc(req
->rq_reqmsg
);
1561 /* Check for export to let only reconnects for not yet evicted
1562 * export to become a HP rpc. */
1563 if ((req
->rq_export
!= NULL
) &&
1564 (opc
== OBD_PING
|| opc
== MDS_CONNECT
|| opc
== OST_CONNECT
))
1565 req
->rq_ops
= &ptlrpc_hpreq_common
;
1569 EXPORT_SYMBOL(ptlrpc_hpreq_handler
);
1571 static int ptlrpc_server_request_add(struct ptlrpc_service_part
*svcpt
,
1572 struct ptlrpc_request
*req
)
1576 rc
= ptlrpc_server_hpreq_init(svcpt
, req
);
1580 ptlrpc_nrs_req_add(svcpt
, req
, !!rc
);
1586 * Allow to handle high priority request
1587 * User can call it w/o any lock but need to hold
1588 * ptlrpc_service_part::scp_req_lock to get reliable result
1590 static bool ptlrpc_server_allow_high(struct ptlrpc_service_part
*svcpt
,
1593 int running
= svcpt
->scp_nthrs_running
;
1595 if (!nrs_svcpt_has_hp(svcpt
))
1601 if (unlikely(svcpt
->scp_service
->srv_req_portal
== MDS_REQUEST_PORTAL
&&
1602 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND
))) {
1603 /* leave just 1 thread for normal RPCs */
1604 running
= PTLRPC_NTHRS_INIT
;
1605 if (svcpt
->scp_service
->srv_ops
.so_hpreq_handler
!= NULL
)
1609 if (svcpt
->scp_nreqs_active
>= running
- 1)
1612 if (svcpt
->scp_nhreqs_active
== 0)
1615 return !ptlrpc_nrs_req_pending_nolock(svcpt
, false) ||
1616 svcpt
->scp_hreq_count
< svcpt
->scp_service
->srv_hpreq_ratio
;
1619 static bool ptlrpc_server_high_pending(struct ptlrpc_service_part
*svcpt
,
1622 return ptlrpc_server_allow_high(svcpt
, force
) &&
1623 ptlrpc_nrs_req_pending_nolock(svcpt
, true);
1627 * Only allow normal priority requests on a service that has a high-priority
1628 * queue if forced (i.e. cleanup), if there are other high priority requests
1629 * already being processed (i.e. those threads can service more high-priority
1630 * requests), or if there are enough idle threads that a later thread can do
1631 * a high priority request.
1632 * User can call it w/o any lock but need to hold
1633 * ptlrpc_service_part::scp_req_lock to get reliable result
1635 static bool ptlrpc_server_allow_normal(struct ptlrpc_service_part
*svcpt
,
1638 int running
= svcpt
->scp_nthrs_running
;
1639 if (unlikely(svcpt
->scp_service
->srv_req_portal
== MDS_REQUEST_PORTAL
&&
1640 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND
))) {
1641 /* leave just 1 thread for normal RPCs */
1642 running
= PTLRPC_NTHRS_INIT
;
1643 if (svcpt
->scp_service
->srv_ops
.so_hpreq_handler
!= NULL
)
1648 svcpt
->scp_nreqs_active
< running
- 2)
1651 if (svcpt
->scp_nreqs_active
>= running
- 1)
1654 return svcpt
->scp_nhreqs_active
> 0 || !nrs_svcpt_has_hp(svcpt
);
1657 static bool ptlrpc_server_normal_pending(struct ptlrpc_service_part
*svcpt
,
1660 return ptlrpc_server_allow_normal(svcpt
, force
) &&
1661 ptlrpc_nrs_req_pending_nolock(svcpt
, false);
1665 * Returns true if there are requests available in incoming
1666 * request queue for processing and it is allowed to fetch them.
1667 * User can call it w/o any lock but need to hold ptlrpc_service::scp_req_lock
1668 * to get reliable result
1669 * \see ptlrpc_server_allow_normal
1670 * \see ptlrpc_server_allow high
1673 ptlrpc_server_request_pending(struct ptlrpc_service_part
*svcpt
, bool force
)
1675 return ptlrpc_server_high_pending(svcpt
, force
) ||
1676 ptlrpc_server_normal_pending(svcpt
, force
);
1680 * Fetch a request for processing from queue of unprocessed requests.
1681 * Favors high-priority requests.
1682 * Returns a pointer to fetched request.
1684 static struct ptlrpc_request
*
1685 ptlrpc_server_request_get(struct ptlrpc_service_part
*svcpt
, bool force
)
1687 struct ptlrpc_request
*req
= NULL
;
1689 spin_lock(&svcpt
->scp_req_lock
);
1691 if (ptlrpc_server_high_pending(svcpt
, force
)) {
1692 req
= ptlrpc_nrs_req_get_nolock(svcpt
, true, force
);
1694 svcpt
->scp_hreq_count
++;
1699 if (ptlrpc_server_normal_pending(svcpt
, force
)) {
1700 req
= ptlrpc_nrs_req_get_nolock(svcpt
, false, force
);
1702 svcpt
->scp_hreq_count
= 0;
1707 spin_unlock(&svcpt
->scp_req_lock
);
1711 svcpt
->scp_nreqs_active
++;
1713 svcpt
->scp_nhreqs_active
++;
1715 spin_unlock(&svcpt
->scp_req_lock
);
1717 if (likely(req
->rq_export
))
1718 class_export_rpc_inc(req
->rq_export
);
1724 * Handle freshly incoming reqs, add to timed early reply list,
1725 * pass on to regular request queue.
1726 * All incoming requests pass through here before getting into
1727 * ptlrpc_server_handle_req later on.
1730 ptlrpc_server_handle_req_in(struct ptlrpc_service_part
*svcpt
,
1731 struct ptlrpc_thread
*thread
)
1733 struct ptlrpc_service
*svc
= svcpt
->scp_service
;
1734 struct ptlrpc_request
*req
;
1738 spin_lock(&svcpt
->scp_lock
);
1739 if (list_empty(&svcpt
->scp_req_incoming
)) {
1740 spin_unlock(&svcpt
->scp_lock
);
1744 req
= list_entry(svcpt
->scp_req_incoming
.next
,
1745 struct ptlrpc_request
, rq_list
);
1746 list_del_init(&req
->rq_list
);
1747 svcpt
->scp_nreqs_incoming
--;
1748 /* Consider this still a "queued" request as far as stats are
1750 spin_unlock(&svcpt
->scp_lock
);
1752 /* go through security check/transform */
1753 rc
= sptlrpc_svc_unwrap_request(req
);
1757 case SECSVC_COMPLETE
:
1758 target_send_reply(req
, 0, OBD_FAIL_MDS_ALL_REPLY_NET
);
1767 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
1768 * redo it wouldn't be harmful.
1770 if (SPTLRPC_FLVR_POLICY(req
->rq_flvr
.sf_rpc
) != SPTLRPC_POLICY_NULL
) {
1771 rc
= ptlrpc_unpack_req_msg(req
, req
->rq_reqlen
);
1773 CERROR("error unpacking request: ptl %d from %s "
1774 "x"LPU64
"\n", svc
->srv_req_portal
,
1775 libcfs_id2str(req
->rq_peer
), req
->rq_xid
);
1780 rc
= lustre_unpack_req_ptlrpc_body(req
, MSG_PTLRPC_BODY_OFF
);
1782 CERROR("error unpacking ptlrpc body: ptl %d from %s x"
1783 LPU64
"\n", svc
->srv_req_portal
,
1784 libcfs_id2str(req
->rq_peer
), req
->rq_xid
);
1788 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC
) &&
1789 lustre_msg_get_opc(req
->rq_reqmsg
) == cfs_fail_val
) {
1790 CERROR("drop incoming rpc opc %u, x"LPU64
"\n",
1791 cfs_fail_val
, req
->rq_xid
);
1796 if (lustre_msg_get_type(req
->rq_reqmsg
) != PTL_RPC_MSG_REQUEST
) {
1797 CERROR("wrong packet type received (type=%u) from %s\n",
1798 lustre_msg_get_type(req
->rq_reqmsg
),
1799 libcfs_id2str(req
->rq_peer
));
1803 switch (lustre_msg_get_opc(req
->rq_reqmsg
)) {
1806 req
->rq_bulk_write
= 1;
1810 case MGS_CONFIG_READ
:
1811 req
->rq_bulk_read
= 1;
1815 CDEBUG(D_RPCTRACE
, "got req x"LPU64
"\n", req
->rq_xid
);
1817 req
->rq_export
= class_conn2export(
1818 lustre_msg_get_handle(req
->rq_reqmsg
));
1819 if (req
->rq_export
) {
1820 rc
= ptlrpc_check_req(req
);
1822 rc
= sptlrpc_target_export_check(req
->rq_export
, req
);
1824 DEBUG_REQ(D_ERROR
, req
, "DROPPING req with "
1825 "illegal security flavor,");
1830 ptlrpc_update_export_timer(req
->rq_export
, 0);
1833 /* req_in handling should/must be fast */
1834 if (cfs_time_current_sec() - req
->rq_arrival_time
.tv_sec
> 5)
1835 DEBUG_REQ(D_WARNING
, req
, "Slow req_in handling "CFS_DURATION_T
"s",
1836 cfs_time_sub(cfs_time_current_sec(),
1837 req
->rq_arrival_time
.tv_sec
));
1839 /* Set rpc server deadline and add it to the timed list */
1840 deadline
= (lustre_msghdr_get_flags(req
->rq_reqmsg
) &
1841 MSGHDR_AT_SUPPORT
) ?
1842 /* The max time the client expects us to take */
1843 lustre_msg_get_timeout(req
->rq_reqmsg
) : obd_timeout
;
1844 req
->rq_deadline
= req
->rq_arrival_time
.tv_sec
+ deadline
;
1845 if (unlikely(deadline
== 0)) {
1846 DEBUG_REQ(D_ERROR
, req
, "Dropping request with 0 timeout");
1850 req
->rq_svc_thread
= thread
;
1852 ptlrpc_at_add_timed(req
);
1854 /* Move it over to the request processing queue */
1855 rc
= ptlrpc_server_request_add(svcpt
, req
);
1859 wake_up(&svcpt
->scp_waitq
);
1863 ptlrpc_server_finish_request(svcpt
, req
);
1869 * Main incoming request handling logic.
1870 * Calls handler function from service to do actual processing.
1873 ptlrpc_server_handle_request(struct ptlrpc_service_part
*svcpt
,
1874 struct ptlrpc_thread
*thread
)
1876 struct ptlrpc_service
*svc
= svcpt
->scp_service
;
1877 struct ptlrpc_request
*request
;
1878 struct timeval work_start
;
1879 struct timeval work_end
;
1884 request
= ptlrpc_server_request_get(svcpt
, false);
1885 if (request
== NULL
)
1888 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT
))
1889 fail_opc
= OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT
;
1890 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT
))
1891 fail_opc
= OBD_FAIL_PTLRPC_HPREQ_TIMEOUT
;
1893 if (unlikely(fail_opc
)) {
1894 if (request
->rq_export
&& request
->rq_ops
)
1895 OBD_FAIL_TIMEOUT(fail_opc
, 4);
1898 ptlrpc_rqphase_move(request
, RQ_PHASE_INTERPRET
);
1900 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG
))
1901 libcfs_debug_dumplog();
1903 do_gettimeofday(&work_start
);
1904 timediff
= cfs_timeval_sub(&work_start
, &request
->rq_arrival_time
,NULL
);
1905 if (likely(svc
->srv_stats
!= NULL
)) {
1906 lprocfs_counter_add(svc
->srv_stats
, PTLRPC_REQWAIT_CNTR
,
1908 lprocfs_counter_add(svc
->srv_stats
, PTLRPC_REQQDEPTH_CNTR
,
1909 svcpt
->scp_nreqs_incoming
);
1910 lprocfs_counter_add(svc
->srv_stats
, PTLRPC_REQACTIVE_CNTR
,
1911 svcpt
->scp_nreqs_active
);
1912 lprocfs_counter_add(svc
->srv_stats
, PTLRPC_TIMEOUT
,
1913 at_get(&svcpt
->scp_at_estimate
));
1916 rc
= lu_context_init(&request
->rq_session
, LCT_SESSION
| LCT_NOREF
);
1918 CERROR("Failure to initialize session: %d\n", rc
);
1921 request
->rq_session
.lc_thread
= thread
;
1922 request
->rq_session
.lc_cookie
= 0x5;
1923 lu_context_enter(&request
->rq_session
);
1925 CDEBUG(D_NET
, "got req "LPU64
"\n", request
->rq_xid
);
1927 request
->rq_svc_thread
= thread
;
1929 request
->rq_svc_thread
->t_env
->le_ses
= &request
->rq_session
;
1931 if (likely(request
->rq_export
)) {
1932 if (unlikely(ptlrpc_check_req(request
)))
1934 ptlrpc_update_export_timer(request
->rq_export
, timediff
>> 19);
1937 /* Discard requests queued for longer than the deadline.
1938 The deadline is increased if we send an early reply. */
1939 if (cfs_time_current_sec() > request
->rq_deadline
) {
1940 DEBUG_REQ(D_ERROR
, request
, "Dropping timed-out request from %s"
1941 ": deadline "CFS_DURATION_T
":"CFS_DURATION_T
"s ago\n",
1942 libcfs_id2str(request
->rq_peer
),
1943 cfs_time_sub(request
->rq_deadline
,
1944 request
->rq_arrival_time
.tv_sec
),
1945 cfs_time_sub(cfs_time_current_sec(),
1946 request
->rq_deadline
));
1950 CDEBUG(D_RPCTRACE
, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc "
1951 "%s:%s+%d:%d:x"LPU64
":%s:%d\n", current_comm(),
1952 (request
->rq_export
?
1953 (char *)request
->rq_export
->exp_client_uuid
.uuid
: "0"),
1954 (request
->rq_export
?
1955 atomic_read(&request
->rq_export
->exp_refcount
) : -99),
1956 lustre_msg_get_status(request
->rq_reqmsg
), request
->rq_xid
,
1957 libcfs_id2str(request
->rq_peer
),
1958 lustre_msg_get_opc(request
->rq_reqmsg
));
1960 if (lustre_msg_get_opc(request
->rq_reqmsg
) != OBD_PING
)
1961 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ
, cfs_fail_val
);
1963 rc
= svc
->srv_ops
.so_req_handler(request
);
1965 ptlrpc_rqphase_move(request
, RQ_PHASE_COMPLETE
);
1968 lu_context_exit(&request
->rq_session
);
1969 lu_context_fini(&request
->rq_session
);
1971 if (unlikely(cfs_time_current_sec() > request
->rq_deadline
)) {
1972 DEBUG_REQ(D_WARNING
, request
,
1973 "Request took longer than estimated ("
1974 CFS_DURATION_T
":"CFS_DURATION_T
1975 "s); client may timeout.",
1976 cfs_time_sub(request
->rq_deadline
,
1977 request
->rq_arrival_time
.tv_sec
),
1978 cfs_time_sub(cfs_time_current_sec(),
1979 request
->rq_deadline
));
1982 do_gettimeofday(&work_end
);
1983 timediff
= cfs_timeval_sub(&work_end
, &work_start
, NULL
);
1984 CDEBUG(D_RPCTRACE
, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc "
1985 "%s:%s+%d:%d:x"LPU64
":%s:%d Request procesed in "
1986 "%ldus (%ldus total) trans "LPU64
" rc %d/%d\n",
1988 (request
->rq_export
?
1989 (char *)request
->rq_export
->exp_client_uuid
.uuid
: "0"),
1990 (request
->rq_export
?
1991 atomic_read(&request
->rq_export
->exp_refcount
) : -99),
1992 lustre_msg_get_status(request
->rq_reqmsg
),
1994 libcfs_id2str(request
->rq_peer
),
1995 lustre_msg_get_opc(request
->rq_reqmsg
),
1997 cfs_timeval_sub(&work_end
, &request
->rq_arrival_time
, NULL
),
1998 (request
->rq_repmsg
?
1999 lustre_msg_get_transno(request
->rq_repmsg
) :
2000 request
->rq_transno
),
2002 (request
->rq_repmsg
?
2003 lustre_msg_get_status(request
->rq_repmsg
) : -999));
2004 if (likely(svc
->srv_stats
!= NULL
&& request
->rq_reqmsg
!= NULL
)) {
2005 __u32 op
= lustre_msg_get_opc(request
->rq_reqmsg
);
2006 int opc
= opcode_offset(op
);
2007 if (opc
> 0 && !(op
== LDLM_ENQUEUE
|| op
== MDS_REINT
)) {
2008 LASSERT(opc
< LUSTRE_MAX_OPCODES
);
2009 lprocfs_counter_add(svc
->srv_stats
,
2010 opc
+ EXTRA_MAX_OPCODES
,
2014 if (unlikely(request
->rq_early_count
)) {
2015 DEBUG_REQ(D_ADAPTTO
, request
,
2016 "sent %d early replies before finishing in "
2018 request
->rq_early_count
,
2019 cfs_time_sub(work_end
.tv_sec
,
2020 request
->rq_arrival_time
.tv_sec
));
2024 ptlrpc_server_finish_active_request(svcpt
, request
);
2030 * An internal function to process a single reply state object.
2033 ptlrpc_handle_rs(struct ptlrpc_reply_state
*rs
)
2035 struct ptlrpc_service_part
*svcpt
= rs
->rs_svcpt
;
2036 struct ptlrpc_service
*svc
= svcpt
->scp_service
;
2037 struct obd_export
*exp
;
2041 exp
= rs
->rs_export
;
2043 LASSERT(rs
->rs_difficult
);
2044 LASSERT(rs
->rs_scheduled
);
2045 LASSERT(list_empty(&rs
->rs_list
));
2047 spin_lock(&exp
->exp_lock
);
2048 /* Noop if removed already */
2049 list_del_init(&rs
->rs_exp_list
);
2050 spin_unlock(&exp
->exp_lock
);
2052 /* The disk commit callback holds exp_uncommitted_replies_lock while it
2053 * iterates over newly committed replies, removing them from
2054 * exp_uncommitted_replies. It then drops this lock and schedules the
2055 * replies it found for handling here.
2057 * We can avoid contention for exp_uncommitted_replies_lock between the
2058 * HRT threads and further commit callbacks by checking rs_committed
2059 * which is set in the commit callback while it holds both
2060 * rs_lock and exp_uncommitted_reples.
2062 * If we see rs_committed clear, the commit callback _may_ not have
2063 * handled this reply yet and we race with it to grab
2064 * exp_uncommitted_replies_lock before removing the reply from
2065 * exp_uncommitted_replies. Note that if we lose the race and the
2066 * reply has already been removed, list_del_init() is a noop.
2068 * If we see rs_committed set, we know the commit callback is handling,
2069 * or has handled this reply since store reordering might allow us to
2070 * see rs_committed set out of sequence. But since this is done
2071 * holding rs_lock, we can be sure it has all completed once we hold
2072 * rs_lock, which we do right next.
2074 if (!rs
->rs_committed
) {
2075 spin_lock(&exp
->exp_uncommitted_replies_lock
);
2076 list_del_init(&rs
->rs_obd_list
);
2077 spin_unlock(&exp
->exp_uncommitted_replies_lock
);
2080 spin_lock(&rs
->rs_lock
);
2082 been_handled
= rs
->rs_handled
;
2085 nlocks
= rs
->rs_nlocks
; /* atomic "steal", but */
2086 rs
->rs_nlocks
= 0; /* locks still on rs_locks! */
2088 if (nlocks
== 0 && !been_handled
) {
2089 /* If we see this, we should already have seen the warning
2090 * in mds_steal_ack_locks() */
2091 CDEBUG(D_HA
, "All locks stolen from rs %p x"LPD64
".t"LPD64
2094 rs
->rs_xid
, rs
->rs_transno
, rs
->rs_opc
,
2095 libcfs_nid2str(exp
->exp_connection
->c_peer
.nid
));
2098 if ((!been_handled
&& rs
->rs_on_net
) || nlocks
> 0) {
2099 spin_unlock(&rs
->rs_lock
);
2101 if (!been_handled
&& rs
->rs_on_net
) {
2102 LNetMDUnlink(rs
->rs_md_h
);
2103 /* Ignore return code; we're racing with completion */
2106 while (nlocks
-- > 0)
2107 ldlm_lock_decref(&rs
->rs_locks
[nlocks
],
2108 rs
->rs_modes
[nlocks
]);
2110 spin_lock(&rs
->rs_lock
);
2113 rs
->rs_scheduled
= 0;
2115 if (!rs
->rs_on_net
) {
2117 spin_unlock(&rs
->rs_lock
);
2119 class_export_put(exp
);
2120 rs
->rs_export
= NULL
;
2121 ptlrpc_rs_decref(rs
);
2122 if (atomic_dec_and_test(&svcpt
->scp_nreps_difficult
) &&
2123 svc
->srv_is_stopping
)
2124 wake_up_all(&svcpt
->scp_waitq
);
2128 /* still on the net; callback will schedule */
2129 spin_unlock(&rs
->rs_lock
);
2135 ptlrpc_check_rqbd_pool(struct ptlrpc_service_part
*svcpt
)
2137 int avail
= svcpt
->scp_nrqbds_posted
;
2138 int low_water
= test_req_buffer_pressure
? 0 :
2139 svcpt
->scp_service
->srv_nbuf_per_group
/ 2;
2141 /* NB I'm not locking; just looking. */
2143 /* CAVEAT EMPTOR: We might be allocating buffers here because we've
2144 * allowed the request history to grow out of control. We could put a
2145 * sanity check on that here and cull some history if we need the
2148 if (avail
<= low_water
)
2149 ptlrpc_grow_req_bufs(svcpt
, 1);
2151 if (svcpt
->scp_service
->srv_stats
) {
2152 lprocfs_counter_add(svcpt
->scp_service
->srv_stats
,
2153 PTLRPC_REQBUF_AVAIL_CNTR
, avail
);
2158 ptlrpc_retry_rqbds(void *arg
)
2160 struct ptlrpc_service_part
*svcpt
= (struct ptlrpc_service_part
*)arg
;
2162 svcpt
->scp_rqbd_timeout
= 0;
2167 ptlrpc_threads_enough(struct ptlrpc_service_part
*svcpt
)
2169 return svcpt
->scp_nreqs_active
<
2170 svcpt
->scp_nthrs_running
- 1 -
2171 (svcpt
->scp_service
->srv_ops
.so_hpreq_handler
!= NULL
);
2175 * allowed to create more threads
2176 * user can call it w/o any lock but need to hold
2177 * ptlrpc_service_part::scp_lock to get reliable result
2180 ptlrpc_threads_increasable(struct ptlrpc_service_part
*svcpt
)
2182 return svcpt
->scp_nthrs_running
+
2183 svcpt
->scp_nthrs_starting
<
2184 svcpt
->scp_service
->srv_nthrs_cpt_limit
;
2188 * too many requests and allowed to create more threads
2191 ptlrpc_threads_need_create(struct ptlrpc_service_part
*svcpt
)
2193 return !ptlrpc_threads_enough(svcpt
) &&
2194 ptlrpc_threads_increasable(svcpt
);
2198 ptlrpc_thread_stopping(struct ptlrpc_thread
*thread
)
2200 return thread_is_stopping(thread
) ||
2201 thread
->t_svcpt
->scp_service
->srv_is_stopping
;
2205 ptlrpc_rqbd_pending(struct ptlrpc_service_part
*svcpt
)
2207 return !list_empty(&svcpt
->scp_rqbd_idle
) &&
2208 svcpt
->scp_rqbd_timeout
== 0;
2212 ptlrpc_at_check(struct ptlrpc_service_part
*svcpt
)
2214 return svcpt
->scp_at_check
;
2218 * requests wait on preprocessing
2219 * user can call it w/o any lock but need to hold
2220 * ptlrpc_service_part::scp_lock to get reliable result
2223 ptlrpc_server_request_incoming(struct ptlrpc_service_part
*svcpt
)
2225 return !list_empty(&svcpt
->scp_req_incoming
);
2228 static __attribute__((__noinline__
)) int
2229 ptlrpc_wait_event(struct ptlrpc_service_part
*svcpt
,
2230 struct ptlrpc_thread
*thread
)
2232 /* Don't exit while there are replies to be handled */
2233 struct l_wait_info lwi
= LWI_TIMEOUT(svcpt
->scp_rqbd_timeout
,
2234 ptlrpc_retry_rqbds
, svcpt
);
2236 /* XXX: Add this back when libcfs watchdog is merged upstream
2237 lc_watchdog_disable(thread->t_watchdog);
2242 l_wait_event_exclusive_head(svcpt
->scp_waitq
,
2243 ptlrpc_thread_stopping(thread
) ||
2244 ptlrpc_server_request_incoming(svcpt
) ||
2245 ptlrpc_server_request_pending(svcpt
, false) ||
2246 ptlrpc_rqbd_pending(svcpt
) ||
2247 ptlrpc_at_check(svcpt
), &lwi
);
2249 if (ptlrpc_thread_stopping(thread
))
2253 lc_watchdog_touch(thread->t_watchdog,
2254 ptlrpc_server_get_timeout(svcpt));
2260 * Main thread body for service threads.
2261 * Waits in a loop waiting for new requests to process to appear.
2262 * Every time an incoming requests is added to its queue, a waitq
2263 * is woken up and one of the threads will handle it.
2265 static int ptlrpc_main(void *arg
)
2267 struct ptlrpc_thread
*thread
= (struct ptlrpc_thread
*)arg
;
2268 struct ptlrpc_service_part
*svcpt
= thread
->t_svcpt
;
2269 struct ptlrpc_service
*svc
= svcpt
->scp_service
;
2270 struct ptlrpc_reply_state
*rs
;
2271 #ifdef WITH_GROUP_INFO
2272 struct group_info
*ginfo
= NULL
;
2275 int counter
= 0, rc
= 0;
2277 thread
->t_pid
= current_pid();
2278 unshare_fs_struct();
2280 /* NB: we will call cfs_cpt_bind() for all threads, because we
2281 * might want to run lustre server only on a subset of system CPUs,
2282 * in that case ->scp_cpt is CFS_CPT_ANY */
2283 rc
= cfs_cpt_bind(svc
->srv_cptable
, svcpt
->scp_cpt
);
2285 CWARN("%s: failed to bind %s on CPT %d\n",
2286 svc
->srv_name
, thread
->t_name
, svcpt
->scp_cpt
);
2289 #ifdef WITH_GROUP_INFO
2290 ginfo
= groups_alloc(0);
2296 set_current_groups(ginfo
);
2297 put_group_info(ginfo
);
2300 if (svc
->srv_ops
.so_thr_init
!= NULL
) {
2301 rc
= svc
->srv_ops
.so_thr_init(thread
);
2312 rc
= lu_context_init(&env
->le_ctx
,
2313 svc
->srv_ctx_tags
|LCT_REMEMBER
|LCT_NOREF
);
2317 thread
->t_env
= env
;
2318 env
->le_ctx
.lc_thread
= thread
;
2319 env
->le_ctx
.lc_cookie
= 0x6;
2321 while (!list_empty(&svcpt
->scp_rqbd_idle
)) {
2322 rc
= ptlrpc_server_post_idle_rqbds(svcpt
);
2326 CERROR("Failed to post rqbd for %s on CPT %d: %d\n",
2327 svc
->srv_name
, svcpt
->scp_cpt
, rc
);
2331 /* Alloc reply state structure for this one */
2332 OBD_ALLOC_LARGE(rs
, svc
->srv_max_reply_size
);
2338 spin_lock(&svcpt
->scp_lock
);
2340 LASSERT(thread_is_starting(thread
));
2341 thread_clear_flags(thread
, SVC_STARTING
);
2343 LASSERT(svcpt
->scp_nthrs_starting
== 1);
2344 svcpt
->scp_nthrs_starting
--;
2346 /* SVC_STOPPING may already be set here if someone else is trying
2347 * to stop the service while this new thread has been dynamically
2348 * forked. We still set SVC_RUNNING to let our creator know that
2349 * we are now running, however we will exit as soon as possible */
2350 thread_add_flags(thread
, SVC_RUNNING
);
2351 svcpt
->scp_nthrs_running
++;
2352 spin_unlock(&svcpt
->scp_lock
);
2354 /* wake up our creator in case he's still waiting. */
2355 wake_up(&thread
->t_ctl_waitq
);
2358 thread->t_watchdog = lc_watchdog_add(ptlrpc_server_get_timeout(svcpt),
2362 spin_lock(&svcpt
->scp_rep_lock
);
2363 list_add(&rs
->rs_list
, &svcpt
->scp_rep_idle
);
2364 wake_up(&svcpt
->scp_rep_waitq
);
2365 spin_unlock(&svcpt
->scp_rep_lock
);
2367 CDEBUG(D_NET
, "service thread %d (#%d) started\n", thread
->t_id
,
2368 svcpt
->scp_nthrs_running
);
2370 /* XXX maintain a list of all managed devices: insert here */
2371 while (!ptlrpc_thread_stopping(thread
)) {
2372 if (ptlrpc_wait_event(svcpt
, thread
))
2375 ptlrpc_check_rqbd_pool(svcpt
);
2377 if (ptlrpc_threads_need_create(svcpt
)) {
2378 /* Ignore return code - we tried... */
2379 ptlrpc_start_thread(svcpt
, 0);
2382 /* Process all incoming reqs before handling any */
2383 if (ptlrpc_server_request_incoming(svcpt
)) {
2384 lu_context_enter(&env
->le_ctx
);
2386 ptlrpc_server_handle_req_in(svcpt
, thread
);
2387 lu_context_exit(&env
->le_ctx
);
2389 /* but limit ourselves in case of flood */
2390 if (counter
++ < 100)
2395 if (ptlrpc_at_check(svcpt
))
2396 ptlrpc_at_check_timed(svcpt
);
2398 if (ptlrpc_server_request_pending(svcpt
, false)) {
2399 lu_context_enter(&env
->le_ctx
);
2400 ptlrpc_server_handle_request(svcpt
, thread
);
2401 lu_context_exit(&env
->le_ctx
);
2404 if (ptlrpc_rqbd_pending(svcpt
) &&
2405 ptlrpc_server_post_idle_rqbds(svcpt
) < 0) {
2406 /* I just failed to repost request buffers.
2407 * Wait for a timeout (unless something else
2408 * happens) before I try again */
2409 svcpt
->scp_rqbd_timeout
= cfs_time_seconds(1) / 10;
2410 CDEBUG(D_RPCTRACE
, "Posted buffers: %d\n",
2411 svcpt
->scp_nrqbds_posted
);
2416 lc_watchdog_delete(thread->t_watchdog);
2417 thread->t_watchdog = NULL;
2422 * deconstruct service specific state created by ptlrpc_start_thread()
2424 if (svc
->srv_ops
.so_thr_done
!= NULL
)
2425 svc
->srv_ops
.so_thr_done(thread
);
2428 lu_context_fini(&env
->le_ctx
);
2432 CDEBUG(D_RPCTRACE
, "service thread [ %p : %u ] %d exiting: rc %d\n",
2433 thread
, thread
->t_pid
, thread
->t_id
, rc
);
2435 spin_lock(&svcpt
->scp_lock
);
2436 if (thread_test_and_clear_flags(thread
, SVC_STARTING
))
2437 svcpt
->scp_nthrs_starting
--;
2439 if (thread_test_and_clear_flags(thread
, SVC_RUNNING
)) {
2440 /* must know immediately */
2441 svcpt
->scp_nthrs_running
--;
2445 thread_add_flags(thread
, SVC_STOPPED
);
2447 wake_up(&thread
->t_ctl_waitq
);
2448 spin_unlock(&svcpt
->scp_lock
);
2453 static int hrt_dont_sleep(struct ptlrpc_hr_thread
*hrt
,
2454 struct list_head
*replies
)
2458 spin_lock(&hrt
->hrt_lock
);
2460 list_splice_init(&hrt
->hrt_queue
, replies
);
2461 result
= ptlrpc_hr
.hr_stopping
|| !list_empty(replies
);
2463 spin_unlock(&hrt
->hrt_lock
);
2468 * Main body of "handle reply" function.
2469 * It processes acked reply states
2471 static int ptlrpc_hr_main(void *arg
)
2473 struct ptlrpc_hr_thread
*hrt
= (struct ptlrpc_hr_thread
*)arg
;
2474 struct ptlrpc_hr_partition
*hrp
= hrt
->hrt_partition
;
2475 LIST_HEAD (replies
);
2476 char threadname
[20];
2479 snprintf(threadname
, sizeof(threadname
), "ptlrpc_hr%02d_%03d",
2480 hrp
->hrp_cpt
, hrt
->hrt_id
);
2481 unshare_fs_struct();
2483 rc
= cfs_cpt_bind(ptlrpc_hr
.hr_cpt_table
, hrp
->hrp_cpt
);
2485 CWARN("Failed to bind %s on CPT %d of CPT table %p: rc = %d\n",
2486 threadname
, hrp
->hrp_cpt
, ptlrpc_hr
.hr_cpt_table
, rc
);
2489 atomic_inc(&hrp
->hrp_nstarted
);
2490 wake_up(&ptlrpc_hr
.hr_waitq
);
2492 while (!ptlrpc_hr
.hr_stopping
) {
2493 l_wait_condition(hrt
->hrt_waitq
, hrt_dont_sleep(hrt
, &replies
));
2495 while (!list_empty(&replies
)) {
2496 struct ptlrpc_reply_state
*rs
;
2498 rs
= list_entry(replies
.prev
,
2499 struct ptlrpc_reply_state
,
2501 list_del_init(&rs
->rs_list
);
2502 ptlrpc_handle_rs(rs
);
2506 atomic_inc(&hrp
->hrp_nstopped
);
2507 wake_up(&ptlrpc_hr
.hr_waitq
);
2512 static void ptlrpc_stop_hr_threads(void)
2514 struct ptlrpc_hr_partition
*hrp
;
2518 ptlrpc_hr
.hr_stopping
= 1;
2520 cfs_percpt_for_each(hrp
, i
, ptlrpc_hr
.hr_partitions
) {
2521 if (hrp
->hrp_thrs
== NULL
)
2522 continue; /* uninitialized */
2523 for (j
= 0; j
< hrp
->hrp_nthrs
; j
++)
2524 wake_up_all(&hrp
->hrp_thrs
[j
].hrt_waitq
);
2527 cfs_percpt_for_each(hrp
, i
, ptlrpc_hr
.hr_partitions
) {
2528 if (hrp
->hrp_thrs
== NULL
)
2529 continue; /* uninitialized */
2530 wait_event(ptlrpc_hr
.hr_waitq
,
2531 atomic_read(&hrp
->hrp_nstopped
) ==
2532 atomic_read(&hrp
->hrp_nstarted
));
2536 static int ptlrpc_start_hr_threads(void)
2538 struct ptlrpc_hr_partition
*hrp
;
2542 cfs_percpt_for_each(hrp
, i
, ptlrpc_hr
.hr_partitions
) {
2545 for (j
= 0; j
< hrp
->hrp_nthrs
; j
++) {
2546 struct ptlrpc_hr_thread
*hrt
= &hrp
->hrp_thrs
[j
];
2547 rc
= PTR_ERR(kthread_run(ptlrpc_hr_main
,
2549 "ptlrpc_hr%02d_%03d",
2552 if (IS_ERR_VALUE(rc
))
2555 wait_event(ptlrpc_hr
.hr_waitq
,
2556 atomic_read(&hrp
->hrp_nstarted
) == j
);
2557 if (!IS_ERR_VALUE(rc
))
2560 CERROR("Reply handling thread %d:%d Failed on starting: "
2561 "rc = %d\n", i
, j
, rc
);
2562 ptlrpc_stop_hr_threads();
2568 static void ptlrpc_svcpt_stop_threads(struct ptlrpc_service_part
*svcpt
)
2570 struct l_wait_info lwi
= { 0 };
2571 struct ptlrpc_thread
*thread
;
2574 CDEBUG(D_INFO
, "Stopping threads for service %s\n",
2575 svcpt
->scp_service
->srv_name
);
2577 spin_lock(&svcpt
->scp_lock
);
2578 /* let the thread know that we would like it to stop asap */
2579 list_for_each_entry(thread
, &svcpt
->scp_threads
, t_link
) {
2580 CDEBUG(D_INFO
, "Stopping thread %s #%u\n",
2581 svcpt
->scp_service
->srv_thread_name
, thread
->t_id
);
2582 thread_add_flags(thread
, SVC_STOPPING
);
2585 wake_up_all(&svcpt
->scp_waitq
);
2587 while (!list_empty(&svcpt
->scp_threads
)) {
2588 thread
= list_entry(svcpt
->scp_threads
.next
,
2589 struct ptlrpc_thread
, t_link
);
2590 if (thread_is_stopped(thread
)) {
2591 list_del(&thread
->t_link
);
2592 list_add(&thread
->t_link
, &zombie
);
2595 spin_unlock(&svcpt
->scp_lock
);
2597 CDEBUG(D_INFO
, "waiting for stopping-thread %s #%u\n",
2598 svcpt
->scp_service
->srv_thread_name
, thread
->t_id
);
2599 l_wait_event(thread
->t_ctl_waitq
,
2600 thread_is_stopped(thread
), &lwi
);
2602 spin_lock(&svcpt
->scp_lock
);
2605 spin_unlock(&svcpt
->scp_lock
);
2607 while (!list_empty(&zombie
)) {
2608 thread
= list_entry(zombie
.next
,
2609 struct ptlrpc_thread
, t_link
);
2610 list_del(&thread
->t_link
);
2611 OBD_FREE_PTR(thread
);
2616 * Stops all threads of a particular service \a svc
2618 void ptlrpc_stop_all_threads(struct ptlrpc_service
*svc
)
2620 struct ptlrpc_service_part
*svcpt
;
2623 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
2624 if (svcpt
->scp_service
!= NULL
)
2625 ptlrpc_svcpt_stop_threads(svcpt
);
2628 EXPORT_SYMBOL(ptlrpc_stop_all_threads
);
2630 int ptlrpc_start_threads(struct ptlrpc_service
*svc
)
2636 /* We require 2 threads min, see note in ptlrpc_server_handle_request */
2637 LASSERT(svc
->srv_nthrs_cpt_init
>= PTLRPC_NTHRS_INIT
);
2639 for (i
= 0; i
< svc
->srv_ncpts
; i
++) {
2640 for (j
= 0; j
< svc
->srv_nthrs_cpt_init
; j
++) {
2641 rc
= ptlrpc_start_thread(svc
->srv_parts
[i
], 1);
2647 /* We have enough threads, don't start more. b=15759 */
2654 CERROR("cannot start %s thread #%d_%d: rc %d\n",
2655 svc
->srv_thread_name
, i
, j
, rc
);
2656 ptlrpc_stop_all_threads(svc
);
2659 EXPORT_SYMBOL(ptlrpc_start_threads
);
2661 int ptlrpc_start_thread(struct ptlrpc_service_part
*svcpt
, int wait
)
2663 struct l_wait_info lwi
= { 0 };
2664 struct ptlrpc_thread
*thread
;
2665 struct ptlrpc_service
*svc
;
2668 LASSERT(svcpt
!= NULL
);
2670 svc
= svcpt
->scp_service
;
2672 CDEBUG(D_RPCTRACE
, "%s[%d] started %d min %d max %d\n",
2673 svc
->srv_name
, svcpt
->scp_cpt
, svcpt
->scp_nthrs_running
,
2674 svc
->srv_nthrs_cpt_init
, svc
->srv_nthrs_cpt_limit
);
2677 if (unlikely(svc
->srv_is_stopping
))
2680 if (!ptlrpc_threads_increasable(svcpt
) ||
2681 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS
) &&
2682 svcpt
->scp_nthrs_running
== svc
->srv_nthrs_cpt_init
- 1))
2685 OBD_CPT_ALLOC_PTR(thread
, svc
->srv_cptable
, svcpt
->scp_cpt
);
2688 init_waitqueue_head(&thread
->t_ctl_waitq
);
2690 spin_lock(&svcpt
->scp_lock
);
2691 if (!ptlrpc_threads_increasable(svcpt
)) {
2692 spin_unlock(&svcpt
->scp_lock
);
2693 OBD_FREE_PTR(thread
);
2697 if (svcpt
->scp_nthrs_starting
!= 0) {
2698 /* serialize starting because some modules (obdfilter)
2699 * might require unique and contiguous t_id */
2700 LASSERT(svcpt
->scp_nthrs_starting
== 1);
2701 spin_unlock(&svcpt
->scp_lock
);
2702 OBD_FREE_PTR(thread
);
2704 CDEBUG(D_INFO
, "Waiting for creating thread %s #%d\n",
2705 svc
->srv_thread_name
, svcpt
->scp_thr_nextid
);
2710 CDEBUG(D_INFO
, "Creating thread %s #%d race, retry later\n",
2711 svc
->srv_thread_name
, svcpt
->scp_thr_nextid
);
2715 svcpt
->scp_nthrs_starting
++;
2716 thread
->t_id
= svcpt
->scp_thr_nextid
++;
2717 thread_add_flags(thread
, SVC_STARTING
);
2718 thread
->t_svcpt
= svcpt
;
2720 list_add(&thread
->t_link
, &svcpt
->scp_threads
);
2721 spin_unlock(&svcpt
->scp_lock
);
2723 if (svcpt
->scp_cpt
>= 0) {
2724 snprintf(thread
->t_name
, sizeof(thread
->t_name
), "%s%02d_%03d",
2725 svc
->srv_thread_name
, svcpt
->scp_cpt
, thread
->t_id
);
2727 snprintf(thread
->t_name
, sizeof(thread
->t_name
), "%s_%04d",
2728 svc
->srv_thread_name
, thread
->t_id
);
2731 CDEBUG(D_RPCTRACE
, "starting thread '%s'\n", thread
->t_name
);
2732 rc
= PTR_ERR(kthread_run(ptlrpc_main
, thread
, "%s", thread
->t_name
));
2733 if (IS_ERR_VALUE(rc
)) {
2734 CERROR("cannot start thread '%s': rc %d\n",
2735 thread
->t_name
, rc
);
2736 spin_lock(&svcpt
->scp_lock
);
2737 --svcpt
->scp_nthrs_starting
;
2738 if (thread_is_stopping(thread
)) {
2739 /* this ptlrpc_thread is being hanled
2740 * by ptlrpc_svcpt_stop_threads now
2742 thread_add_flags(thread
, SVC_STOPPED
);
2743 wake_up(&thread
->t_ctl_waitq
);
2744 spin_unlock(&svcpt
->scp_lock
);
2746 list_del(&thread
->t_link
);
2747 spin_unlock(&svcpt
->scp_lock
);
2748 OBD_FREE_PTR(thread
);
2756 l_wait_event(thread
->t_ctl_waitq
,
2757 thread_is_running(thread
) || thread_is_stopped(thread
),
2760 rc
= thread_is_stopped(thread
) ? thread
->t_id
: 0;
2764 int ptlrpc_hr_init(void)
2767 struct ptlrpc_hr_partition
*hrp
;
2768 struct ptlrpc_hr_thread
*hrt
;
2774 memset(&ptlrpc_hr
, 0, sizeof(ptlrpc_hr
));
2775 ptlrpc_hr
.hr_cpt_table
= cfs_cpt_table
;
2777 ptlrpc_hr
.hr_partitions
= cfs_percpt_alloc(ptlrpc_hr
.hr_cpt_table
,
2779 if (ptlrpc_hr
.hr_partitions
== NULL
)
2782 init_waitqueue_head(&ptlrpc_hr
.hr_waitq
);
2784 cpumask_copy(&mask
, topology_thread_cpumask(0));
2785 weight
= cpus_weight(mask
);
2787 cfs_percpt_for_each(hrp
, i
, ptlrpc_hr
.hr_partitions
) {
2790 atomic_set(&hrp
->hrp_nstarted
, 0);
2791 atomic_set(&hrp
->hrp_nstopped
, 0);
2793 hrp
->hrp_nthrs
= cfs_cpt_weight(ptlrpc_hr
.hr_cpt_table
, i
);
2794 hrp
->hrp_nthrs
/= weight
;
2796 LASSERT(hrp
->hrp_nthrs
> 0);
2797 OBD_CPT_ALLOC(hrp
->hrp_thrs
, ptlrpc_hr
.hr_cpt_table
, i
,
2798 hrp
->hrp_nthrs
* sizeof(*hrt
));
2799 if (hrp
->hrp_thrs
== NULL
)
2800 GOTO(out
, rc
= -ENOMEM
);
2802 for (j
= 0; j
< hrp
->hrp_nthrs
; j
++) {
2803 hrt
= &hrp
->hrp_thrs
[j
];
2806 hrt
->hrt_partition
= hrp
;
2807 init_waitqueue_head(&hrt
->hrt_waitq
);
2808 spin_lock_init(&hrt
->hrt_lock
);
2809 INIT_LIST_HEAD(&hrt
->hrt_queue
);
2813 rc
= ptlrpc_start_hr_threads();
2820 void ptlrpc_hr_fini(void)
2822 struct ptlrpc_hr_partition
*hrp
;
2825 if (ptlrpc_hr
.hr_partitions
== NULL
)
2828 ptlrpc_stop_hr_threads();
2830 cfs_percpt_for_each(hrp
, i
, ptlrpc_hr
.hr_partitions
) {
2831 if (hrp
->hrp_thrs
!= NULL
) {
2832 OBD_FREE(hrp
->hrp_thrs
,
2833 hrp
->hrp_nthrs
* sizeof(hrp
->hrp_thrs
[0]));
2837 cfs_percpt_free(ptlrpc_hr
.hr_partitions
);
2838 ptlrpc_hr
.hr_partitions
= NULL
;
2843 * Wait until all already scheduled replies are processed.
2845 static void ptlrpc_wait_replies(struct ptlrpc_service_part
*svcpt
)
2849 struct l_wait_info lwi
= LWI_TIMEOUT(cfs_time_seconds(10),
2852 rc
= l_wait_event(svcpt
->scp_waitq
,
2853 atomic_read(&svcpt
->scp_nreps_difficult
) == 0, &lwi
);
2856 CWARN("Unexpectedly long timeout %s %p\n",
2857 svcpt
->scp_service
->srv_name
, svcpt
->scp_service
);
2862 ptlrpc_service_del_atimer(struct ptlrpc_service
*svc
)
2864 struct ptlrpc_service_part
*svcpt
;
2867 /* early disarm AT timer... */
2868 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
2869 if (svcpt
->scp_service
!= NULL
)
2870 cfs_timer_disarm(&svcpt
->scp_at_timer
);
2875 ptlrpc_service_unlink_rqbd(struct ptlrpc_service
*svc
)
2877 struct ptlrpc_service_part
*svcpt
;
2878 struct ptlrpc_request_buffer_desc
*rqbd
;
2879 struct l_wait_info lwi
;
2883 /* All history will be culled when the next request buffer is
2884 * freed in ptlrpc_service_purge_all() */
2885 svc
->srv_hist_nrqbds_cpt_max
= 0;
2887 rc
= LNetClearLazyPortal(svc
->srv_req_portal
);
2890 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
2891 if (svcpt
->scp_service
== NULL
)
2894 /* Unlink all the request buffers. This forces a 'final'
2895 * event with its 'unlink' flag set for each posted rqbd */
2896 list_for_each_entry(rqbd
, &svcpt
->scp_rqbd_posted
,
2898 rc
= LNetMDUnlink(rqbd
->rqbd_md_h
);
2899 LASSERT(rc
== 0 || rc
== -ENOENT
);
2903 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
2904 if (svcpt
->scp_service
== NULL
)
2907 /* Wait for the network to release any buffers
2908 * it's currently filling */
2909 spin_lock(&svcpt
->scp_lock
);
2910 while (svcpt
->scp_nrqbds_posted
!= 0) {
2911 spin_unlock(&svcpt
->scp_lock
);
2912 /* Network access will complete in finite time but
2913 * the HUGE timeout lets us CWARN for visibility
2914 * of sluggish NALs */
2915 lwi
= LWI_TIMEOUT_INTERVAL(
2916 cfs_time_seconds(LONG_UNLINK
),
2917 cfs_time_seconds(1), NULL
, NULL
);
2918 rc
= l_wait_event(svcpt
->scp_waitq
,
2919 svcpt
->scp_nrqbds_posted
== 0, &lwi
);
2920 if (rc
== -ETIMEDOUT
) {
2921 CWARN("Service %s waiting for "
2922 "request buffers\n",
2923 svcpt
->scp_service
->srv_name
);
2925 spin_lock(&svcpt
->scp_lock
);
2927 spin_unlock(&svcpt
->scp_lock
);
2932 ptlrpc_service_purge_all(struct ptlrpc_service
*svc
)
2934 struct ptlrpc_service_part
*svcpt
;
2935 struct ptlrpc_request_buffer_desc
*rqbd
;
2936 struct ptlrpc_request
*req
;
2937 struct ptlrpc_reply_state
*rs
;
2940 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
2941 if (svcpt
->scp_service
== NULL
)
2944 spin_lock(&svcpt
->scp_rep_lock
);
2945 while (!list_empty(&svcpt
->scp_rep_active
)) {
2946 rs
= list_entry(svcpt
->scp_rep_active
.next
,
2947 struct ptlrpc_reply_state
, rs_list
);
2948 spin_lock(&rs
->rs_lock
);
2949 ptlrpc_schedule_difficult_reply(rs
);
2950 spin_unlock(&rs
->rs_lock
);
2952 spin_unlock(&svcpt
->scp_rep_lock
);
2954 /* purge the request queue. NB No new replies (rqbds
2955 * all unlinked) and no service threads, so I'm the only
2956 * thread noodling the request queue now */
2957 while (!list_empty(&svcpt
->scp_req_incoming
)) {
2958 req
= list_entry(svcpt
->scp_req_incoming
.next
,
2959 struct ptlrpc_request
, rq_list
);
2961 list_del(&req
->rq_list
);
2962 svcpt
->scp_nreqs_incoming
--;
2963 ptlrpc_server_finish_request(svcpt
, req
);
2966 while (ptlrpc_server_request_pending(svcpt
, true)) {
2967 req
= ptlrpc_server_request_get(svcpt
, true);
2968 ptlrpc_server_finish_active_request(svcpt
, req
);
2971 LASSERT(list_empty(&svcpt
->scp_rqbd_posted
));
2972 LASSERT(svcpt
->scp_nreqs_incoming
== 0);
2973 LASSERT(svcpt
->scp_nreqs_active
== 0);
2974 /* history should have been culled by
2975 * ptlrpc_server_finish_request */
2976 LASSERT(svcpt
->scp_hist_nrqbds
== 0);
2978 /* Now free all the request buffers since nothing
2979 * references them any more... */
2981 while (!list_empty(&svcpt
->scp_rqbd_idle
)) {
2982 rqbd
= list_entry(svcpt
->scp_rqbd_idle
.next
,
2983 struct ptlrpc_request_buffer_desc
,
2985 ptlrpc_free_rqbd(rqbd
);
2987 ptlrpc_wait_replies(svcpt
);
2989 while (!list_empty(&svcpt
->scp_rep_idle
)) {
2990 rs
= list_entry(svcpt
->scp_rep_idle
.next
,
2991 struct ptlrpc_reply_state
,
2993 list_del(&rs
->rs_list
);
2994 OBD_FREE_LARGE(rs
, svc
->srv_max_reply_size
);
3000 ptlrpc_service_free(struct ptlrpc_service
*svc
)
3002 struct ptlrpc_service_part
*svcpt
;
3003 struct ptlrpc_at_array
*array
;
3006 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
3007 if (svcpt
->scp_service
== NULL
)
3010 /* In case somebody rearmed this in the meantime */
3011 cfs_timer_disarm(&svcpt
->scp_at_timer
);
3012 array
= &svcpt
->scp_at_array
;
3014 if (array
->paa_reqs_array
!= NULL
) {
3015 OBD_FREE(array
->paa_reqs_array
,
3016 sizeof(struct list_head
) * array
->paa_size
);
3017 array
->paa_reqs_array
= NULL
;
3020 if (array
->paa_reqs_count
!= NULL
) {
3021 OBD_FREE(array
->paa_reqs_count
,
3022 sizeof(__u32
) * array
->paa_size
);
3023 array
->paa_reqs_count
= NULL
;
3027 ptlrpc_service_for_each_part(svcpt
, i
, svc
)
3028 OBD_FREE_PTR(svcpt
);
3030 if (svc
->srv_cpts
!= NULL
)
3031 cfs_expr_list_values_free(svc
->srv_cpts
, svc
->srv_ncpts
);
3033 OBD_FREE(svc
, offsetof(struct ptlrpc_service
,
3034 srv_parts
[svc
->srv_ncpts
]));
3037 int ptlrpc_unregister_service(struct ptlrpc_service
*service
)
3039 CDEBUG(D_NET
, "%s: tearing down\n", service
->srv_name
);
3041 service
->srv_is_stopping
= 1;
3043 mutex_lock(&ptlrpc_all_services_mutex
);
3044 list_del_init(&service
->srv_list
);
3045 mutex_unlock(&ptlrpc_all_services_mutex
);
3047 ptlrpc_service_del_atimer(service
);
3048 ptlrpc_stop_all_threads(service
);
3050 ptlrpc_service_unlink_rqbd(service
);
3051 ptlrpc_service_purge_all(service
);
3052 ptlrpc_service_nrs_cleanup(service
);
3054 ptlrpc_lprocfs_unregister_service(service
);
3056 ptlrpc_service_free(service
);
3060 EXPORT_SYMBOL(ptlrpc_unregister_service
);
3063 * Returns 0 if the service is healthy.
3065 * Right now, it just checks to make sure that requests aren't languishing
3066 * in the queue. We'll use this health check to govern whether a node needs
3067 * to be shot, so it's intentionally non-aggressive. */
3068 int ptlrpc_svcpt_health_check(struct ptlrpc_service_part
*svcpt
)
3070 struct ptlrpc_request
*request
= NULL
;
3071 struct timeval right_now
;
3074 do_gettimeofday(&right_now
);
3076 spin_lock(&svcpt
->scp_req_lock
);
3077 /* How long has the next entry been waiting? */
3078 if (ptlrpc_server_high_pending(svcpt
, true))
3079 request
= ptlrpc_nrs_req_peek_nolock(svcpt
, true);
3080 else if (ptlrpc_server_normal_pending(svcpt
, true))
3081 request
= ptlrpc_nrs_req_peek_nolock(svcpt
, false);
3083 if (request
== NULL
) {
3084 spin_unlock(&svcpt
->scp_req_lock
);
3088 timediff
= cfs_timeval_sub(&right_now
, &request
->rq_arrival_time
, NULL
);
3089 spin_unlock(&svcpt
->scp_req_lock
);
3091 if ((timediff
/ ONE_MILLION
) >
3092 (AT_OFF
? obd_timeout
* 3 / 2 : at_max
)) {
3093 CERROR("%s: unhealthy - request has been waiting %lds\n",
3094 svcpt
->scp_service
->srv_name
, timediff
/ ONE_MILLION
);
3102 ptlrpc_service_health_check(struct ptlrpc_service
*svc
)
3104 struct ptlrpc_service_part
*svcpt
;
3110 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
3111 int rc
= ptlrpc_svcpt_health_check(svcpt
);
3118 EXPORT_SYMBOL(ptlrpc_service_health_check
);