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 CFS_MODULE_PARM(test_req_buffer_pressure
, "i", int, 0444,
48 "set non-zero to put pressure on request buffer pools");
49 CFS_MODULE_PARM(at_min
, "i", int, 0644,
50 "Adaptive timeout minimum (sec)");
51 CFS_MODULE_PARM(at_max
, "i", int, 0644,
52 "Adaptive timeout maximum (sec)");
53 CFS_MODULE_PARM(at_history
, "i", int, 0644,
54 "Adaptive timeouts remember the slowest event that took place "
55 "within this period (sec)");
56 CFS_MODULE_PARM(at_early_margin
, "i", int, 0644,
57 "How soon before an RPC deadline to send an early reply");
58 CFS_MODULE_PARM(at_extra
, "i", int, 0644,
59 "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 proc_dir_entry_t
*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
)) {
1118 /* Failing over, don't handle any more reqs, send
1119 error response instead. */
1120 CDEBUG(D_RPCTRACE
, "Dropping req %p for failed obd %s\n",
1121 req
, req
->rq_export
->exp_obd
->obd_name
);
1123 } else if (lustre_msg_get_flags(req
->rq_reqmsg
) &
1124 (MSG_REPLAY
| MSG_REQ_REPLAY_DONE
) &&
1125 !(req
->rq_export
->exp_obd
->obd_recovering
)) {
1126 DEBUG_REQ(D_ERROR
, req
,
1127 "Invalid replay without recovery");
1128 class_fail_export(req
->rq_export
);
1130 } else if (lustre_msg_get_transno(req
->rq_reqmsg
) != 0 &&
1131 !(req
->rq_export
->exp_obd
->obd_recovering
)) {
1132 DEBUG_REQ(D_ERROR
, req
, "Invalid req with transno "
1133 LPU64
" without recovery",
1134 lustre_msg_get_transno(req
->rq_reqmsg
));
1135 class_fail_export(req
->rq_export
);
1139 if (unlikely(rc
< 0)) {
1140 req
->rq_status
= rc
;
1146 static void ptlrpc_at_set_timer(struct ptlrpc_service_part
*svcpt
)
1148 struct ptlrpc_at_array
*array
= &svcpt
->scp_at_array
;
1151 if (array
->paa_count
== 0) {
1152 cfs_timer_disarm(&svcpt
->scp_at_timer
);
1156 /* Set timer for closest deadline */
1157 next
= (__s32
)(array
->paa_deadline
- cfs_time_current_sec() -
1160 ptlrpc_at_timer((unsigned long)svcpt
);
1162 cfs_timer_arm(&svcpt
->scp_at_timer
, cfs_time_shift(next
));
1163 CDEBUG(D_INFO
, "armed %s at %+ds\n",
1164 svcpt
->scp_service
->srv_name
, next
);
1168 /* Add rpc to early reply check list */
1169 static int ptlrpc_at_add_timed(struct ptlrpc_request
*req
)
1171 struct ptlrpc_service_part
*svcpt
= req
->rq_rqbd
->rqbd_svcpt
;
1172 struct ptlrpc_at_array
*array
= &svcpt
->scp_at_array
;
1173 struct ptlrpc_request
*rq
= NULL
;
1179 if (req
->rq_no_reply
)
1182 if ((lustre_msghdr_get_flags(req
->rq_reqmsg
) & MSGHDR_AT_SUPPORT
) == 0)
1185 spin_lock(&svcpt
->scp_at_lock
);
1186 LASSERT(list_empty(&req
->rq_timed_list
));
1188 index
= (unsigned long)req
->rq_deadline
% array
->paa_size
;
1189 if (array
->paa_reqs_count
[index
] > 0) {
1190 /* latest rpcs will have the latest deadlines in the list,
1191 * so search backward. */
1192 list_for_each_entry_reverse(rq
,
1193 &array
->paa_reqs_array
[index
],
1195 if (req
->rq_deadline
>= rq
->rq_deadline
) {
1196 list_add(&req
->rq_timed_list
,
1197 &rq
->rq_timed_list
);
1203 /* Add the request at the head of the list */
1204 if (list_empty(&req
->rq_timed_list
))
1205 list_add(&req
->rq_timed_list
,
1206 &array
->paa_reqs_array
[index
]);
1208 spin_lock(&req
->rq_lock
);
1209 req
->rq_at_linked
= 1;
1210 spin_unlock(&req
->rq_lock
);
1211 req
->rq_at_index
= index
;
1212 array
->paa_reqs_count
[index
]++;
1214 if (array
->paa_count
== 1 || array
->paa_deadline
> req
->rq_deadline
) {
1215 array
->paa_deadline
= req
->rq_deadline
;
1216 ptlrpc_at_set_timer(svcpt
);
1218 spin_unlock(&svcpt
->scp_at_lock
);
1224 ptlrpc_at_remove_timed(struct ptlrpc_request
*req
)
1226 struct ptlrpc_at_array
*array
;
1228 array
= &req
->rq_rqbd
->rqbd_svcpt
->scp_at_array
;
1230 /* NB: must call with hold svcpt::scp_at_lock */
1231 LASSERT(!list_empty(&req
->rq_timed_list
));
1232 list_del_init(&req
->rq_timed_list
);
1234 spin_lock(&req
->rq_lock
);
1235 req
->rq_at_linked
= 0;
1236 spin_unlock(&req
->rq_lock
);
1238 array
->paa_reqs_count
[req
->rq_at_index
]--;
1242 static int ptlrpc_at_send_early_reply(struct ptlrpc_request
*req
)
1244 struct ptlrpc_service_part
*svcpt
= req
->rq_rqbd
->rqbd_svcpt
;
1245 struct ptlrpc_request
*reqcopy
;
1246 struct lustre_msg
*reqmsg
;
1247 cfs_duration_t olddl
= req
->rq_deadline
- cfs_time_current_sec();
1251 /* deadline is when the client expects us to reply, margin is the
1252 difference between clients' and servers' expectations */
1253 DEBUG_REQ(D_ADAPTTO
, req
,
1254 "%ssending early reply (deadline %+lds, margin %+lds) for "
1255 "%d+%d", AT_OFF
? "AT off - not " : "",
1256 olddl
, olddl
- at_get(&svcpt
->scp_at_estimate
),
1257 at_get(&svcpt
->scp_at_estimate
), at_extra
);
1263 DEBUG_REQ(D_WARNING
, req
, "Already past deadline (%+lds), "
1264 "not sending early reply. Consider increasing "
1265 "at_early_margin (%d)?", olddl
, at_early_margin
);
1267 /* Return an error so we're not re-added to the timed list. */
1271 if ((lustre_msghdr_get_flags(req
->rq_reqmsg
) & MSGHDR_AT_SUPPORT
) == 0){
1272 DEBUG_REQ(D_INFO
, req
, "Wanted to ask client for more time, "
1273 "but no AT support");
1277 if (req
->rq_export
&&
1278 lustre_msg_get_flags(req
->rq_reqmsg
) &
1279 (MSG_REPLAY
| MSG_REQ_REPLAY_DONE
| MSG_LOCK_REPLAY_DONE
)) {
1280 /* During recovery, we don't want to send too many early
1281 * replies, but on the other hand we want to make sure the
1282 * client has enough time to resend if the rpc is lost. So
1283 * during the recovery period send at least 4 early replies,
1284 * spacing them every at_extra if we can. at_estimate should
1285 * always equal this fixed value during recovery. */
1286 at_measured(&svcpt
->scp_at_estimate
, min(at_extra
,
1287 req
->rq_export
->exp_obd
->obd_recovery_timeout
/ 4));
1289 /* Fake our processing time into the future to ask the clients
1290 * for some extra amount of time */
1291 at_measured(&svcpt
->scp_at_estimate
, at_extra
+
1292 cfs_time_current_sec() -
1293 req
->rq_arrival_time
.tv_sec
);
1295 /* Check to see if we've actually increased the deadline -
1296 * we may be past adaptive_max */
1297 if (req
->rq_deadline
>= req
->rq_arrival_time
.tv_sec
+
1298 at_get(&svcpt
->scp_at_estimate
)) {
1299 DEBUG_REQ(D_WARNING
, req
, "Couldn't add any time "
1300 "(%ld/%ld), not sending early reply\n",
1301 olddl
, req
->rq_arrival_time
.tv_sec
+
1302 at_get(&svcpt
->scp_at_estimate
) -
1303 cfs_time_current_sec());
1307 newdl
= cfs_time_current_sec() + at_get(&svcpt
->scp_at_estimate
);
1309 OBD_ALLOC(reqcopy
, sizeof *reqcopy
);
1310 if (reqcopy
== NULL
)
1312 OBD_ALLOC_LARGE(reqmsg
, req
->rq_reqlen
);
1314 OBD_FREE(reqcopy
, sizeof *reqcopy
);
1319 reqcopy
->rq_reply_state
= NULL
;
1320 reqcopy
->rq_rep_swab_mask
= 0;
1321 reqcopy
->rq_pack_bulk
= 0;
1322 reqcopy
->rq_pack_udesc
= 0;
1323 reqcopy
->rq_packed_final
= 0;
1324 sptlrpc_svc_ctx_addref(reqcopy
);
1325 /* We only need the reqmsg for the magic */
1326 reqcopy
->rq_reqmsg
= reqmsg
;
1327 memcpy(reqmsg
, req
->rq_reqmsg
, req
->rq_reqlen
);
1329 LASSERT(atomic_read(&req
->rq_refcount
));
1330 /** if it is last refcount then early reply isn't needed */
1331 if (atomic_read(&req
->rq_refcount
) == 1) {
1332 DEBUG_REQ(D_ADAPTTO
, reqcopy
, "Normal reply already sent out, "
1333 "abort sending early reply\n");
1334 GOTO(out
, rc
= -EINVAL
);
1337 /* Connection ref */
1338 reqcopy
->rq_export
= class_conn2export(
1339 lustre_msg_get_handle(reqcopy
->rq_reqmsg
));
1340 if (reqcopy
->rq_export
== NULL
)
1341 GOTO(out
, rc
= -ENODEV
);
1344 class_export_rpc_inc(reqcopy
->rq_export
);
1345 if (reqcopy
->rq_export
->exp_obd
&&
1346 reqcopy
->rq_export
->exp_obd
->obd_fail
)
1347 GOTO(out_put
, rc
= -ENODEV
);
1349 rc
= lustre_pack_reply_flags(reqcopy
, 1, NULL
, NULL
, LPRFL_EARLY_REPLY
);
1353 rc
= ptlrpc_send_reply(reqcopy
, PTLRPC_REPLY_EARLY
);
1356 /* Adjust our own deadline to what we told the client */
1357 req
->rq_deadline
= newdl
;
1358 req
->rq_early_count
++; /* number sent, server side */
1360 DEBUG_REQ(D_ERROR
, req
, "Early reply send failed %d", rc
);
1363 /* Free the (early) reply state from lustre_pack_reply.
1364 (ptlrpc_send_reply takes it's own rs ref, so this is safe here) */
1365 ptlrpc_req_drop_rs(reqcopy
);
1368 class_export_rpc_dec(reqcopy
->rq_export
);
1369 class_export_put(reqcopy
->rq_export
);
1371 sptlrpc_svc_ctx_decref(reqcopy
);
1372 OBD_FREE_LARGE(reqmsg
, req
->rq_reqlen
);
1373 OBD_FREE(reqcopy
, sizeof *reqcopy
);
1377 /* Send early replies to everybody expiring within at_early_margin
1378 asking for at_extra time */
1379 static int ptlrpc_at_check_timed(struct ptlrpc_service_part
*svcpt
)
1381 struct ptlrpc_at_array
*array
= &svcpt
->scp_at_array
;
1382 struct ptlrpc_request
*rq
, *n
;
1383 struct list_head work_list
;
1386 time_t now
= cfs_time_current_sec();
1387 cfs_duration_t delay
;
1388 int first
, counter
= 0;
1390 spin_lock(&svcpt
->scp_at_lock
);
1391 if (svcpt
->scp_at_check
== 0) {
1392 spin_unlock(&svcpt
->scp_at_lock
);
1395 delay
= cfs_time_sub(cfs_time_current(), svcpt
->scp_at_checktime
);
1396 svcpt
->scp_at_check
= 0;
1398 if (array
->paa_count
== 0) {
1399 spin_unlock(&svcpt
->scp_at_lock
);
1403 /* The timer went off, but maybe the nearest rpc already completed. */
1404 first
= array
->paa_deadline
- now
;
1405 if (first
> at_early_margin
) {
1406 /* We've still got plenty of time. Reset the timer. */
1407 ptlrpc_at_set_timer(svcpt
);
1408 spin_unlock(&svcpt
->scp_at_lock
);
1412 /* We're close to a timeout, and we don't know how much longer the
1413 server will take. Send early replies to everyone expiring soon. */
1414 INIT_LIST_HEAD(&work_list
);
1416 index
= (unsigned long)array
->paa_deadline
% array
->paa_size
;
1417 count
= array
->paa_count
;
1419 count
-= array
->paa_reqs_count
[index
];
1420 list_for_each_entry_safe(rq
, n
,
1421 &array
->paa_reqs_array
[index
],
1423 if (rq
->rq_deadline
> now
+ at_early_margin
) {
1424 /* update the earliest deadline */
1425 if (deadline
== -1 ||
1426 rq
->rq_deadline
< deadline
)
1427 deadline
= rq
->rq_deadline
;
1431 ptlrpc_at_remove_timed(rq
);
1433 * ptlrpc_server_drop_request() may drop
1434 * refcount to 0 already. Let's check this and
1435 * don't add entry to work_list
1437 if (likely(atomic_inc_not_zero(&rq
->rq_refcount
)))
1438 list_add(&rq
->rq_timed_list
, &work_list
);
1442 if (++index
>= array
->paa_size
)
1445 array
->paa_deadline
= deadline
;
1446 /* we have a new earliest deadline, restart the timer */
1447 ptlrpc_at_set_timer(svcpt
);
1449 spin_unlock(&svcpt
->scp_at_lock
);
1451 CDEBUG(D_ADAPTTO
, "timeout in %+ds, asking for %d secs on %d early "
1452 "replies\n", first
, at_extra
, counter
);
1454 /* We're already past request deadlines before we even get a
1455 chance to send early replies */
1456 LCONSOLE_WARN("%s: This server is not able to keep up with "
1457 "request traffic (cpu-bound).\n",
1458 svcpt
->scp_service
->srv_name
);
1459 CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, "
1460 "delay="CFS_DURATION_T
"(jiff)\n",
1461 counter
, svcpt
->scp_nreqs_incoming
,
1462 svcpt
->scp_nreqs_active
,
1463 at_get(&svcpt
->scp_at_estimate
), delay
);
1466 /* we took additional refcount so entries can't be deleted from list, no
1467 * locking is needed */
1468 while (!list_empty(&work_list
)) {
1469 rq
= list_entry(work_list
.next
, struct ptlrpc_request
,
1471 list_del_init(&rq
->rq_timed_list
);
1473 if (ptlrpc_at_send_early_reply(rq
) == 0)
1474 ptlrpc_at_add_timed(rq
);
1476 ptlrpc_server_drop_request(rq
);
1479 return 1; /* return "did_something" for liblustre */
1483 * Put the request to the export list if the request may become
1484 * a high priority one.
1486 static int ptlrpc_server_hpreq_init(struct ptlrpc_service_part
*svcpt
,
1487 struct ptlrpc_request
*req
)
1491 if (svcpt
->scp_service
->srv_ops
.so_hpreq_handler
) {
1492 rc
= svcpt
->scp_service
->srv_ops
.so_hpreq_handler(req
);
1497 if (req
->rq_export
&& req
->rq_ops
) {
1498 /* Perform request specific check. We should do this check
1499 * before the request is added into exp_hp_rpcs list otherwise
1500 * it may hit swab race at LU-1044. */
1501 if (req
->rq_ops
->hpreq_check
) {
1502 rc
= req
->rq_ops
->hpreq_check(req
);
1504 * XXX: Out of all current
1505 * ptlrpc_hpreq_ops::hpreq_check(), only
1506 * ldlm_cancel_hpreq_check() can return an error code;
1507 * other functions assert in similar places, which seems
1508 * odd. What also does not seem right is that handlers
1509 * for those RPCs do not assert on the same checks, but
1510 * rather handle the error cases. e.g. see
1511 * ost_rw_hpreq_check(), and ost_brw_read(),
1516 LASSERT(rc
== 0 || rc
== 1);
1519 spin_lock_bh(&req
->rq_export
->exp_rpc_lock
);
1520 list_add(&req
->rq_exp_list
,
1521 &req
->rq_export
->exp_hp_rpcs
);
1522 spin_unlock_bh(&req
->rq_export
->exp_rpc_lock
);
1525 ptlrpc_nrs_req_initialize(svcpt
, req
, rc
);
1530 /** Remove the request from the export list. */
1531 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request
*req
)
1533 if (req
->rq_export
&& req
->rq_ops
) {
1534 /* refresh lock timeout again so that client has more
1535 * room to send lock cancel RPC. */
1536 if (req
->rq_ops
->hpreq_fini
)
1537 req
->rq_ops
->hpreq_fini(req
);
1539 spin_lock_bh(&req
->rq_export
->exp_rpc_lock
);
1540 list_del_init(&req
->rq_exp_list
);
1541 spin_unlock_bh(&req
->rq_export
->exp_rpc_lock
);
1545 static int ptlrpc_hpreq_check(struct ptlrpc_request
*req
)
1550 static struct ptlrpc_hpreq_ops ptlrpc_hpreq_common
= {
1551 .hpreq_check
= ptlrpc_hpreq_check
,
1554 /* Hi-Priority RPC check by RPC operation code. */
1555 int ptlrpc_hpreq_handler(struct ptlrpc_request
*req
)
1557 int opc
= lustre_msg_get_opc(req
->rq_reqmsg
);
1559 /* Check for export to let only reconnects for not yet evicted
1560 * export to become a HP rpc. */
1561 if ((req
->rq_export
!= NULL
) &&
1562 (opc
== OBD_PING
|| opc
== MDS_CONNECT
|| opc
== OST_CONNECT
))
1563 req
->rq_ops
= &ptlrpc_hpreq_common
;
1567 EXPORT_SYMBOL(ptlrpc_hpreq_handler
);
1569 static int ptlrpc_server_request_add(struct ptlrpc_service_part
*svcpt
,
1570 struct ptlrpc_request
*req
)
1574 rc
= ptlrpc_server_hpreq_init(svcpt
, req
);
1578 ptlrpc_nrs_req_add(svcpt
, req
, !!rc
);
1584 * Allow to handle high priority request
1585 * User can call it w/o any lock but need to hold
1586 * ptlrpc_service_part::scp_req_lock to get reliable result
1588 static bool ptlrpc_server_allow_high(struct ptlrpc_service_part
*svcpt
,
1591 int running
= svcpt
->scp_nthrs_running
;
1593 if (!nrs_svcpt_has_hp(svcpt
))
1599 if (unlikely(svcpt
->scp_service
->srv_req_portal
== MDS_REQUEST_PORTAL
&&
1600 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND
))) {
1601 /* leave just 1 thread for normal RPCs */
1602 running
= PTLRPC_NTHRS_INIT
;
1603 if (svcpt
->scp_service
->srv_ops
.so_hpreq_handler
!= NULL
)
1607 if (svcpt
->scp_nreqs_active
>= running
- 1)
1610 if (svcpt
->scp_nhreqs_active
== 0)
1613 return !ptlrpc_nrs_req_pending_nolock(svcpt
, false) ||
1614 svcpt
->scp_hreq_count
< svcpt
->scp_service
->srv_hpreq_ratio
;
1617 static bool ptlrpc_server_high_pending(struct ptlrpc_service_part
*svcpt
,
1620 return ptlrpc_server_allow_high(svcpt
, force
) &&
1621 ptlrpc_nrs_req_pending_nolock(svcpt
, true);
1625 * Only allow normal priority requests on a service that has a high-priority
1626 * queue if forced (i.e. cleanup), if there are other high priority requests
1627 * already being processed (i.e. those threads can service more high-priority
1628 * requests), or if there are enough idle threads that a later thread can do
1629 * a high priority request.
1630 * User can call it w/o any lock but need to hold
1631 * ptlrpc_service_part::scp_req_lock to get reliable result
1633 static bool ptlrpc_server_allow_normal(struct ptlrpc_service_part
*svcpt
,
1636 int running
= svcpt
->scp_nthrs_running
;
1637 if (unlikely(svcpt
->scp_service
->srv_req_portal
== MDS_REQUEST_PORTAL
&&
1638 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND
))) {
1639 /* leave just 1 thread for normal RPCs */
1640 running
= PTLRPC_NTHRS_INIT
;
1641 if (svcpt
->scp_service
->srv_ops
.so_hpreq_handler
!= NULL
)
1646 svcpt
->scp_nreqs_active
< running
- 2)
1649 if (svcpt
->scp_nreqs_active
>= running
- 1)
1652 return svcpt
->scp_nhreqs_active
> 0 || !nrs_svcpt_has_hp(svcpt
);
1655 static bool ptlrpc_server_normal_pending(struct ptlrpc_service_part
*svcpt
,
1658 return ptlrpc_server_allow_normal(svcpt
, force
) &&
1659 ptlrpc_nrs_req_pending_nolock(svcpt
, false);
1663 * Returns true if there are requests available in incoming
1664 * request queue for processing and it is allowed to fetch them.
1665 * User can call it w/o any lock but need to hold ptlrpc_service::scp_req_lock
1666 * to get reliable result
1667 * \see ptlrpc_server_allow_normal
1668 * \see ptlrpc_server_allow high
1671 ptlrpc_server_request_pending(struct ptlrpc_service_part
*svcpt
, bool force
)
1673 return ptlrpc_server_high_pending(svcpt
, force
) ||
1674 ptlrpc_server_normal_pending(svcpt
, force
);
1678 * Fetch a request for processing from queue of unprocessed requests.
1679 * Favors high-priority requests.
1680 * Returns a pointer to fetched request.
1682 static struct ptlrpc_request
*
1683 ptlrpc_server_request_get(struct ptlrpc_service_part
*svcpt
, bool force
)
1685 struct ptlrpc_request
*req
= NULL
;
1687 spin_lock(&svcpt
->scp_req_lock
);
1689 if (ptlrpc_server_high_pending(svcpt
, force
)) {
1690 req
= ptlrpc_nrs_req_get_nolock(svcpt
, true, force
);
1692 svcpt
->scp_hreq_count
++;
1697 if (ptlrpc_server_normal_pending(svcpt
, force
)) {
1698 req
= ptlrpc_nrs_req_get_nolock(svcpt
, false, force
);
1700 svcpt
->scp_hreq_count
= 0;
1705 spin_unlock(&svcpt
->scp_req_lock
);
1709 svcpt
->scp_nreqs_active
++;
1711 svcpt
->scp_nhreqs_active
++;
1713 spin_unlock(&svcpt
->scp_req_lock
);
1715 if (likely(req
->rq_export
))
1716 class_export_rpc_inc(req
->rq_export
);
1722 * Handle freshly incoming reqs, add to timed early reply list,
1723 * pass on to regular request queue.
1724 * All incoming requests pass through here before getting into
1725 * ptlrpc_server_handle_req later on.
1728 ptlrpc_server_handle_req_in(struct ptlrpc_service_part
*svcpt
,
1729 struct ptlrpc_thread
*thread
)
1731 struct ptlrpc_service
*svc
= svcpt
->scp_service
;
1732 struct ptlrpc_request
*req
;
1736 spin_lock(&svcpt
->scp_lock
);
1737 if (list_empty(&svcpt
->scp_req_incoming
)) {
1738 spin_unlock(&svcpt
->scp_lock
);
1742 req
= list_entry(svcpt
->scp_req_incoming
.next
,
1743 struct ptlrpc_request
, rq_list
);
1744 list_del_init(&req
->rq_list
);
1745 svcpt
->scp_nreqs_incoming
--;
1746 /* Consider this still a "queued" request as far as stats are
1748 spin_unlock(&svcpt
->scp_lock
);
1750 /* go through security check/transform */
1751 rc
= sptlrpc_svc_unwrap_request(req
);
1755 case SECSVC_COMPLETE
:
1756 target_send_reply(req
, 0, OBD_FAIL_MDS_ALL_REPLY_NET
);
1765 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
1766 * redo it wouldn't be harmful.
1768 if (SPTLRPC_FLVR_POLICY(req
->rq_flvr
.sf_rpc
) != SPTLRPC_POLICY_NULL
) {
1769 rc
= ptlrpc_unpack_req_msg(req
, req
->rq_reqlen
);
1771 CERROR("error unpacking request: ptl %d from %s "
1772 "x"LPU64
"\n", svc
->srv_req_portal
,
1773 libcfs_id2str(req
->rq_peer
), req
->rq_xid
);
1778 rc
= lustre_unpack_req_ptlrpc_body(req
, MSG_PTLRPC_BODY_OFF
);
1780 CERROR ("error unpacking ptlrpc body: ptl %d from %s x"
1781 LPU64
"\n", svc
->srv_req_portal
,
1782 libcfs_id2str(req
->rq_peer
), req
->rq_xid
);
1786 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC
) &&
1787 lustre_msg_get_opc(req
->rq_reqmsg
) == cfs_fail_val
) {
1788 CERROR("drop incoming rpc opc %u, x"LPU64
"\n",
1789 cfs_fail_val
, req
->rq_xid
);
1794 if (lustre_msg_get_type(req
->rq_reqmsg
) != PTL_RPC_MSG_REQUEST
) {
1795 CERROR("wrong packet type received (type=%u) from %s\n",
1796 lustre_msg_get_type(req
->rq_reqmsg
),
1797 libcfs_id2str(req
->rq_peer
));
1801 switch(lustre_msg_get_opc(req
->rq_reqmsg
)) {
1804 req
->rq_bulk_write
= 1;
1808 case MGS_CONFIG_READ
:
1809 req
->rq_bulk_read
= 1;
1813 CDEBUG(D_RPCTRACE
, "got req x"LPU64
"\n", req
->rq_xid
);
1815 req
->rq_export
= class_conn2export(
1816 lustre_msg_get_handle(req
->rq_reqmsg
));
1817 if (req
->rq_export
) {
1818 rc
= ptlrpc_check_req(req
);
1820 rc
= sptlrpc_target_export_check(req
->rq_export
, req
);
1822 DEBUG_REQ(D_ERROR
, req
, "DROPPING req with "
1823 "illegal security flavor,");
1828 ptlrpc_update_export_timer(req
->rq_export
, 0);
1831 /* req_in handling should/must be fast */
1832 if (cfs_time_current_sec() - req
->rq_arrival_time
.tv_sec
> 5)
1833 DEBUG_REQ(D_WARNING
, req
, "Slow req_in handling "CFS_DURATION_T
"s",
1834 cfs_time_sub(cfs_time_current_sec(),
1835 req
->rq_arrival_time
.tv_sec
));
1837 /* Set rpc server deadline and add it to the timed list */
1838 deadline
= (lustre_msghdr_get_flags(req
->rq_reqmsg
) &
1839 MSGHDR_AT_SUPPORT
) ?
1840 /* The max time the client expects us to take */
1841 lustre_msg_get_timeout(req
->rq_reqmsg
) : obd_timeout
;
1842 req
->rq_deadline
= req
->rq_arrival_time
.tv_sec
+ deadline
;
1843 if (unlikely(deadline
== 0)) {
1844 DEBUG_REQ(D_ERROR
, req
, "Dropping request with 0 timeout");
1848 req
->rq_svc_thread
= thread
;
1850 ptlrpc_at_add_timed(req
);
1852 /* Move it over to the request processing queue */
1853 rc
= ptlrpc_server_request_add(svcpt
, req
);
1857 wake_up(&svcpt
->scp_waitq
);
1861 ptlrpc_server_finish_request(svcpt
, req
);
1867 * Main incoming request handling logic.
1868 * Calls handler function from service to do actual processing.
1871 ptlrpc_server_handle_request(struct ptlrpc_service_part
*svcpt
,
1872 struct ptlrpc_thread
*thread
)
1874 struct ptlrpc_service
*svc
= svcpt
->scp_service
;
1875 struct ptlrpc_request
*request
;
1876 struct timeval work_start
;
1877 struct timeval work_end
;
1882 request
= ptlrpc_server_request_get(svcpt
, false);
1883 if (request
== NULL
)
1886 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT
))
1887 fail_opc
= OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT
;
1888 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT
))
1889 fail_opc
= OBD_FAIL_PTLRPC_HPREQ_TIMEOUT
;
1891 if (unlikely(fail_opc
)) {
1892 if (request
->rq_export
&& request
->rq_ops
)
1893 OBD_FAIL_TIMEOUT(fail_opc
, 4);
1896 ptlrpc_rqphase_move(request
, RQ_PHASE_INTERPRET
);
1898 if(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG
))
1899 libcfs_debug_dumplog();
1901 do_gettimeofday(&work_start
);
1902 timediff
= cfs_timeval_sub(&work_start
, &request
->rq_arrival_time
,NULL
);
1903 if (likely(svc
->srv_stats
!= NULL
)) {
1904 lprocfs_counter_add(svc
->srv_stats
, PTLRPC_REQWAIT_CNTR
,
1906 lprocfs_counter_add(svc
->srv_stats
, PTLRPC_REQQDEPTH_CNTR
,
1907 svcpt
->scp_nreqs_incoming
);
1908 lprocfs_counter_add(svc
->srv_stats
, PTLRPC_REQACTIVE_CNTR
,
1909 svcpt
->scp_nreqs_active
);
1910 lprocfs_counter_add(svc
->srv_stats
, PTLRPC_TIMEOUT
,
1911 at_get(&svcpt
->scp_at_estimate
));
1914 rc
= lu_context_init(&request
->rq_session
, LCT_SESSION
| LCT_NOREF
);
1916 CERROR("Failure to initialize session: %d\n", rc
);
1919 request
->rq_session
.lc_thread
= thread
;
1920 request
->rq_session
.lc_cookie
= 0x5;
1921 lu_context_enter(&request
->rq_session
);
1923 CDEBUG(D_NET
, "got req "LPU64
"\n", request
->rq_xid
);
1925 request
->rq_svc_thread
= thread
;
1927 request
->rq_svc_thread
->t_env
->le_ses
= &request
->rq_session
;
1929 if (likely(request
->rq_export
)) {
1930 if (unlikely(ptlrpc_check_req(request
)))
1932 ptlrpc_update_export_timer(request
->rq_export
, timediff
>> 19);
1935 /* Discard requests queued for longer than the deadline.
1936 The deadline is increased if we send an early reply. */
1937 if (cfs_time_current_sec() > request
->rq_deadline
) {
1938 DEBUG_REQ(D_ERROR
, request
, "Dropping timed-out request from %s"
1939 ": deadline "CFS_DURATION_T
":"CFS_DURATION_T
"s ago\n",
1940 libcfs_id2str(request
->rq_peer
),
1941 cfs_time_sub(request
->rq_deadline
,
1942 request
->rq_arrival_time
.tv_sec
),
1943 cfs_time_sub(cfs_time_current_sec(),
1944 request
->rq_deadline
));
1948 CDEBUG(D_RPCTRACE
, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc "
1949 "%s:%s+%d:%d:x"LPU64
":%s:%d\n", current_comm(),
1950 (request
->rq_export
?
1951 (char *)request
->rq_export
->exp_client_uuid
.uuid
: "0"),
1952 (request
->rq_export
?
1953 atomic_read(&request
->rq_export
->exp_refcount
) : -99),
1954 lustre_msg_get_status(request
->rq_reqmsg
), request
->rq_xid
,
1955 libcfs_id2str(request
->rq_peer
),
1956 lustre_msg_get_opc(request
->rq_reqmsg
));
1958 if (lustre_msg_get_opc(request
->rq_reqmsg
) != OBD_PING
)
1959 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ
, cfs_fail_val
);
1961 rc
= svc
->srv_ops
.so_req_handler(request
);
1963 ptlrpc_rqphase_move(request
, RQ_PHASE_COMPLETE
);
1966 lu_context_exit(&request
->rq_session
);
1967 lu_context_fini(&request
->rq_session
);
1969 if (unlikely(cfs_time_current_sec() > request
->rq_deadline
)) {
1970 DEBUG_REQ(D_WARNING
, request
, "Request took longer "
1971 "than estimated ("CFS_DURATION_T
":"CFS_DURATION_T
"s);"
1972 " client may timeout.",
1973 cfs_time_sub(request
->rq_deadline
,
1974 request
->rq_arrival_time
.tv_sec
),
1975 cfs_time_sub(cfs_time_current_sec(),
1976 request
->rq_deadline
));
1979 do_gettimeofday(&work_end
);
1980 timediff
= cfs_timeval_sub(&work_end
, &work_start
, NULL
);
1981 CDEBUG(D_RPCTRACE
, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc "
1982 "%s:%s+%d:%d:x"LPU64
":%s:%d Request procesed in "
1983 "%ldus (%ldus total) trans "LPU64
" rc %d/%d\n",
1985 (request
->rq_export
?
1986 (char *)request
->rq_export
->exp_client_uuid
.uuid
: "0"),
1987 (request
->rq_export
?
1988 atomic_read(&request
->rq_export
->exp_refcount
) : -99),
1989 lustre_msg_get_status(request
->rq_reqmsg
),
1991 libcfs_id2str(request
->rq_peer
),
1992 lustre_msg_get_opc(request
->rq_reqmsg
),
1994 cfs_timeval_sub(&work_end
, &request
->rq_arrival_time
, NULL
),
1995 (request
->rq_repmsg
?
1996 lustre_msg_get_transno(request
->rq_repmsg
) :
1997 request
->rq_transno
),
1999 (request
->rq_repmsg
?
2000 lustre_msg_get_status(request
->rq_repmsg
) : -999));
2001 if (likely(svc
->srv_stats
!= NULL
&& request
->rq_reqmsg
!= NULL
)) {
2002 __u32 op
= lustre_msg_get_opc(request
->rq_reqmsg
);
2003 int opc
= opcode_offset(op
);
2004 if (opc
> 0 && !(op
== LDLM_ENQUEUE
|| op
== MDS_REINT
)) {
2005 LASSERT(opc
< LUSTRE_MAX_OPCODES
);
2006 lprocfs_counter_add(svc
->srv_stats
,
2007 opc
+ EXTRA_MAX_OPCODES
,
2011 if (unlikely(request
->rq_early_count
)) {
2012 DEBUG_REQ(D_ADAPTTO
, request
,
2013 "sent %d early replies before finishing in "
2015 request
->rq_early_count
,
2016 cfs_time_sub(work_end
.tv_sec
,
2017 request
->rq_arrival_time
.tv_sec
));
2021 ptlrpc_server_finish_active_request(svcpt
, request
);
2027 * An internal function to process a single reply state object.
2030 ptlrpc_handle_rs(struct ptlrpc_reply_state
*rs
)
2032 struct ptlrpc_service_part
*svcpt
= rs
->rs_svcpt
;
2033 struct ptlrpc_service
*svc
= svcpt
->scp_service
;
2034 struct obd_export
*exp
;
2038 exp
= rs
->rs_export
;
2040 LASSERT (rs
->rs_difficult
);
2041 LASSERT (rs
->rs_scheduled
);
2042 LASSERT (list_empty(&rs
->rs_list
));
2044 spin_lock(&exp
->exp_lock
);
2045 /* Noop if removed already */
2046 list_del_init (&rs
->rs_exp_list
);
2047 spin_unlock(&exp
->exp_lock
);
2049 /* The disk commit callback holds exp_uncommitted_replies_lock while it
2050 * iterates over newly committed replies, removing them from
2051 * exp_uncommitted_replies. It then drops this lock and schedules the
2052 * replies it found for handling here.
2054 * We can avoid contention for exp_uncommitted_replies_lock between the
2055 * HRT threads and further commit callbacks by checking rs_committed
2056 * which is set in the commit callback while it holds both
2057 * rs_lock and exp_uncommitted_reples.
2059 * If we see rs_committed clear, the commit callback _may_ not have
2060 * handled this reply yet and we race with it to grab
2061 * exp_uncommitted_replies_lock before removing the reply from
2062 * exp_uncommitted_replies. Note that if we lose the race and the
2063 * reply has already been removed, list_del_init() is a noop.
2065 * If we see rs_committed set, we know the commit callback is handling,
2066 * or has handled this reply since store reordering might allow us to
2067 * see rs_committed set out of sequence. But since this is done
2068 * holding rs_lock, we can be sure it has all completed once we hold
2069 * rs_lock, which we do right next.
2071 if (!rs
->rs_committed
) {
2072 spin_lock(&exp
->exp_uncommitted_replies_lock
);
2073 list_del_init(&rs
->rs_obd_list
);
2074 spin_unlock(&exp
->exp_uncommitted_replies_lock
);
2077 spin_lock(&rs
->rs_lock
);
2079 been_handled
= rs
->rs_handled
;
2082 nlocks
= rs
->rs_nlocks
; /* atomic "steal", but */
2083 rs
->rs_nlocks
= 0; /* locks still on rs_locks! */
2085 if (nlocks
== 0 && !been_handled
) {
2086 /* If we see this, we should already have seen the warning
2087 * in mds_steal_ack_locks() */
2088 CDEBUG(D_HA
, "All locks stolen from rs %p x"LPD64
".t"LPD64
2091 rs
->rs_xid
, rs
->rs_transno
, rs
->rs_opc
,
2092 libcfs_nid2str(exp
->exp_connection
->c_peer
.nid
));
2095 if ((!been_handled
&& rs
->rs_on_net
) || nlocks
> 0) {
2096 spin_unlock(&rs
->rs_lock
);
2098 if (!been_handled
&& rs
->rs_on_net
) {
2099 LNetMDUnlink(rs
->rs_md_h
);
2100 /* Ignore return code; we're racing with completion */
2103 while (nlocks
-- > 0)
2104 ldlm_lock_decref(&rs
->rs_locks
[nlocks
],
2105 rs
->rs_modes
[nlocks
]);
2107 spin_lock(&rs
->rs_lock
);
2110 rs
->rs_scheduled
= 0;
2112 if (!rs
->rs_on_net
) {
2114 spin_unlock(&rs
->rs_lock
);
2116 class_export_put (exp
);
2117 rs
->rs_export
= NULL
;
2118 ptlrpc_rs_decref (rs
);
2119 if (atomic_dec_and_test(&svcpt
->scp_nreps_difficult
) &&
2120 svc
->srv_is_stopping
)
2121 wake_up_all(&svcpt
->scp_waitq
);
2125 /* still on the net; callback will schedule */
2126 spin_unlock(&rs
->rs_lock
);
2132 ptlrpc_check_rqbd_pool(struct ptlrpc_service_part
*svcpt
)
2134 int avail
= svcpt
->scp_nrqbds_posted
;
2135 int low_water
= test_req_buffer_pressure
? 0 :
2136 svcpt
->scp_service
->srv_nbuf_per_group
/ 2;
2138 /* NB I'm not locking; just looking. */
2140 /* CAVEAT EMPTOR: We might be allocating buffers here because we've
2141 * allowed the request history to grow out of control. We could put a
2142 * sanity check on that here and cull some history if we need the
2145 if (avail
<= low_water
)
2146 ptlrpc_grow_req_bufs(svcpt
, 1);
2148 if (svcpt
->scp_service
->srv_stats
) {
2149 lprocfs_counter_add(svcpt
->scp_service
->srv_stats
,
2150 PTLRPC_REQBUF_AVAIL_CNTR
, avail
);
2155 ptlrpc_retry_rqbds(void *arg
)
2157 struct ptlrpc_service_part
*svcpt
= (struct ptlrpc_service_part
*)arg
;
2159 svcpt
->scp_rqbd_timeout
= 0;
2164 ptlrpc_threads_enough(struct ptlrpc_service_part
*svcpt
)
2166 return svcpt
->scp_nreqs_active
<
2167 svcpt
->scp_nthrs_running
- 1 -
2168 (svcpt
->scp_service
->srv_ops
.so_hpreq_handler
!= NULL
);
2172 * allowed to create more threads
2173 * user can call it w/o any lock but need to hold
2174 * ptlrpc_service_part::scp_lock to get reliable result
2177 ptlrpc_threads_increasable(struct ptlrpc_service_part
*svcpt
)
2179 return svcpt
->scp_nthrs_running
+
2180 svcpt
->scp_nthrs_starting
<
2181 svcpt
->scp_service
->srv_nthrs_cpt_limit
;
2185 * too many requests and allowed to create more threads
2188 ptlrpc_threads_need_create(struct ptlrpc_service_part
*svcpt
)
2190 return !ptlrpc_threads_enough(svcpt
) &&
2191 ptlrpc_threads_increasable(svcpt
);
2195 ptlrpc_thread_stopping(struct ptlrpc_thread
*thread
)
2197 return thread_is_stopping(thread
) ||
2198 thread
->t_svcpt
->scp_service
->srv_is_stopping
;
2202 ptlrpc_rqbd_pending(struct ptlrpc_service_part
*svcpt
)
2204 return !list_empty(&svcpt
->scp_rqbd_idle
) &&
2205 svcpt
->scp_rqbd_timeout
== 0;
2209 ptlrpc_at_check(struct ptlrpc_service_part
*svcpt
)
2211 return svcpt
->scp_at_check
;
2215 * requests wait on preprocessing
2216 * user can call it w/o any lock but need to hold
2217 * ptlrpc_service_part::scp_lock to get reliable result
2220 ptlrpc_server_request_incoming(struct ptlrpc_service_part
*svcpt
)
2222 return !list_empty(&svcpt
->scp_req_incoming
);
2225 static __attribute__((__noinline__
)) int
2226 ptlrpc_wait_event(struct ptlrpc_service_part
*svcpt
,
2227 struct ptlrpc_thread
*thread
)
2229 /* Don't exit while there are replies to be handled */
2230 struct l_wait_info lwi
= LWI_TIMEOUT(svcpt
->scp_rqbd_timeout
,
2231 ptlrpc_retry_rqbds
, svcpt
);
2233 /* XXX: Add this back when libcfs watchdog is merged upstream
2234 lc_watchdog_disable(thread->t_watchdog);
2239 l_wait_event_exclusive_head(svcpt
->scp_waitq
,
2240 ptlrpc_thread_stopping(thread
) ||
2241 ptlrpc_server_request_incoming(svcpt
) ||
2242 ptlrpc_server_request_pending(svcpt
, false) ||
2243 ptlrpc_rqbd_pending(svcpt
) ||
2244 ptlrpc_at_check(svcpt
), &lwi
);
2246 if (ptlrpc_thread_stopping(thread
))
2250 lc_watchdog_touch(thread->t_watchdog,
2251 ptlrpc_server_get_timeout(svcpt));
2257 * Main thread body for service threads.
2258 * Waits in a loop waiting for new requests to process to appear.
2259 * Every time an incoming requests is added to its queue, a waitq
2260 * is woken up and one of the threads will handle it.
2262 static int ptlrpc_main(void *arg
)
2264 struct ptlrpc_thread
*thread
= (struct ptlrpc_thread
*)arg
;
2265 struct ptlrpc_service_part
*svcpt
= thread
->t_svcpt
;
2266 struct ptlrpc_service
*svc
= svcpt
->scp_service
;
2267 struct ptlrpc_reply_state
*rs
;
2268 #ifdef WITH_GROUP_INFO
2269 group_info_t
*ginfo
= NULL
;
2272 int counter
= 0, rc
= 0;
2274 thread
->t_pid
= current_pid();
2275 unshare_fs_struct();
2277 /* NB: we will call cfs_cpt_bind() for all threads, because we
2278 * might want to run lustre server only on a subset of system CPUs,
2279 * in that case ->scp_cpt is CFS_CPT_ANY */
2280 rc
= cfs_cpt_bind(svc
->srv_cptable
, svcpt
->scp_cpt
);
2282 CWARN("%s: failed to bind %s on CPT %d\n",
2283 svc
->srv_name
, thread
->t_name
, svcpt
->scp_cpt
);
2286 #ifdef WITH_GROUP_INFO
2287 ginfo
= groups_alloc(0);
2293 set_current_groups(ginfo
);
2294 put_group_info(ginfo
);
2297 if (svc
->srv_ops
.so_thr_init
!= NULL
) {
2298 rc
= svc
->srv_ops
.so_thr_init(thread
);
2309 rc
= lu_context_init(&env
->le_ctx
,
2310 svc
->srv_ctx_tags
|LCT_REMEMBER
|LCT_NOREF
);
2314 thread
->t_env
= env
;
2315 env
->le_ctx
.lc_thread
= thread
;
2316 env
->le_ctx
.lc_cookie
= 0x6;
2318 while (!list_empty(&svcpt
->scp_rqbd_idle
)) {
2319 rc
= ptlrpc_server_post_idle_rqbds(svcpt
);
2323 CERROR("Failed to post rqbd for %s on CPT %d: %d\n",
2324 svc
->srv_name
, svcpt
->scp_cpt
, rc
);
2328 /* Alloc reply state structure for this one */
2329 OBD_ALLOC_LARGE(rs
, svc
->srv_max_reply_size
);
2335 spin_lock(&svcpt
->scp_lock
);
2337 LASSERT(thread_is_starting(thread
));
2338 thread_clear_flags(thread
, SVC_STARTING
);
2340 LASSERT(svcpt
->scp_nthrs_starting
== 1);
2341 svcpt
->scp_nthrs_starting
--;
2343 /* SVC_STOPPING may already be set here if someone else is trying
2344 * to stop the service while this new thread has been dynamically
2345 * forked. We still set SVC_RUNNING to let our creator know that
2346 * we are now running, however we will exit as soon as possible */
2347 thread_add_flags(thread
, SVC_RUNNING
);
2348 svcpt
->scp_nthrs_running
++;
2349 spin_unlock(&svcpt
->scp_lock
);
2351 /* wake up our creator in case he's still waiting. */
2352 wake_up(&thread
->t_ctl_waitq
);
2355 thread->t_watchdog = lc_watchdog_add(ptlrpc_server_get_timeout(svcpt),
2359 spin_lock(&svcpt
->scp_rep_lock
);
2360 list_add(&rs
->rs_list
, &svcpt
->scp_rep_idle
);
2361 wake_up(&svcpt
->scp_rep_waitq
);
2362 spin_unlock(&svcpt
->scp_rep_lock
);
2364 CDEBUG(D_NET
, "service thread %d (#%d) started\n", thread
->t_id
,
2365 svcpt
->scp_nthrs_running
);
2367 /* XXX maintain a list of all managed devices: insert here */
2368 while (!ptlrpc_thread_stopping(thread
)) {
2369 if (ptlrpc_wait_event(svcpt
, thread
))
2372 ptlrpc_check_rqbd_pool(svcpt
);
2374 if (ptlrpc_threads_need_create(svcpt
)) {
2375 /* Ignore return code - we tried... */
2376 ptlrpc_start_thread(svcpt
, 0);
2379 /* Process all incoming reqs before handling any */
2380 if (ptlrpc_server_request_incoming(svcpt
)) {
2381 lu_context_enter(&env
->le_ctx
);
2383 ptlrpc_server_handle_req_in(svcpt
, thread
);
2384 lu_context_exit(&env
->le_ctx
);
2386 /* but limit ourselves in case of flood */
2387 if (counter
++ < 100)
2392 if (ptlrpc_at_check(svcpt
))
2393 ptlrpc_at_check_timed(svcpt
);
2395 if (ptlrpc_server_request_pending(svcpt
, false)) {
2396 lu_context_enter(&env
->le_ctx
);
2397 ptlrpc_server_handle_request(svcpt
, thread
);
2398 lu_context_exit(&env
->le_ctx
);
2401 if (ptlrpc_rqbd_pending(svcpt
) &&
2402 ptlrpc_server_post_idle_rqbds(svcpt
) < 0) {
2403 /* I just failed to repost request buffers.
2404 * Wait for a timeout (unless something else
2405 * happens) before I try again */
2406 svcpt
->scp_rqbd_timeout
= cfs_time_seconds(1) / 10;
2407 CDEBUG(D_RPCTRACE
, "Posted buffers: %d\n",
2408 svcpt
->scp_nrqbds_posted
);
2413 lc_watchdog_delete(thread->t_watchdog);
2414 thread->t_watchdog = NULL;
2419 * deconstruct service specific state created by ptlrpc_start_thread()
2421 if (svc
->srv_ops
.so_thr_done
!= NULL
)
2422 svc
->srv_ops
.so_thr_done(thread
);
2425 lu_context_fini(&env
->le_ctx
);
2429 CDEBUG(D_RPCTRACE
, "service thread [ %p : %u ] %d exiting: rc %d\n",
2430 thread
, thread
->t_pid
, thread
->t_id
, rc
);
2432 spin_lock(&svcpt
->scp_lock
);
2433 if (thread_test_and_clear_flags(thread
, SVC_STARTING
))
2434 svcpt
->scp_nthrs_starting
--;
2436 if (thread_test_and_clear_flags(thread
, SVC_RUNNING
)) {
2437 /* must know immediately */
2438 svcpt
->scp_nthrs_running
--;
2442 thread_add_flags(thread
, SVC_STOPPED
);
2444 wake_up(&thread
->t_ctl_waitq
);
2445 spin_unlock(&svcpt
->scp_lock
);
2450 static int hrt_dont_sleep(struct ptlrpc_hr_thread
*hrt
,
2451 struct list_head
*replies
)
2455 spin_lock(&hrt
->hrt_lock
);
2457 list_splice_init(&hrt
->hrt_queue
, replies
);
2458 result
= ptlrpc_hr
.hr_stopping
|| !list_empty(replies
);
2460 spin_unlock(&hrt
->hrt_lock
);
2465 * Main body of "handle reply" function.
2466 * It processes acked reply states
2468 static int ptlrpc_hr_main(void *arg
)
2470 struct ptlrpc_hr_thread
*hrt
= (struct ptlrpc_hr_thread
*)arg
;
2471 struct ptlrpc_hr_partition
*hrp
= hrt
->hrt_partition
;
2472 LIST_HEAD (replies
);
2473 char threadname
[20];
2476 snprintf(threadname
, sizeof(threadname
), "ptlrpc_hr%02d_%03d",
2477 hrp
->hrp_cpt
, hrt
->hrt_id
);
2478 unshare_fs_struct();
2480 rc
= cfs_cpt_bind(ptlrpc_hr
.hr_cpt_table
, hrp
->hrp_cpt
);
2482 CWARN("Failed to bind %s on CPT %d of CPT table %p: rc = %d\n",
2483 threadname
, hrp
->hrp_cpt
, ptlrpc_hr
.hr_cpt_table
, rc
);
2486 atomic_inc(&hrp
->hrp_nstarted
);
2487 wake_up(&ptlrpc_hr
.hr_waitq
);
2489 while (!ptlrpc_hr
.hr_stopping
) {
2490 l_wait_condition(hrt
->hrt_waitq
, hrt_dont_sleep(hrt
, &replies
));
2492 while (!list_empty(&replies
)) {
2493 struct ptlrpc_reply_state
*rs
;
2495 rs
= list_entry(replies
.prev
,
2496 struct ptlrpc_reply_state
,
2498 list_del_init(&rs
->rs_list
);
2499 ptlrpc_handle_rs(rs
);
2503 atomic_inc(&hrp
->hrp_nstopped
);
2504 wake_up(&ptlrpc_hr
.hr_waitq
);
2509 static void ptlrpc_stop_hr_threads(void)
2511 struct ptlrpc_hr_partition
*hrp
;
2515 ptlrpc_hr
.hr_stopping
= 1;
2517 cfs_percpt_for_each(hrp
, i
, ptlrpc_hr
.hr_partitions
) {
2518 if (hrp
->hrp_thrs
== NULL
)
2519 continue; /* uninitialized */
2520 for (j
= 0; j
< hrp
->hrp_nthrs
; j
++)
2521 wake_up_all(&hrp
->hrp_thrs
[j
].hrt_waitq
);
2524 cfs_percpt_for_each(hrp
, i
, ptlrpc_hr
.hr_partitions
) {
2525 if (hrp
->hrp_thrs
== NULL
)
2526 continue; /* uninitialized */
2527 wait_event(ptlrpc_hr
.hr_waitq
,
2528 atomic_read(&hrp
->hrp_nstopped
) ==
2529 atomic_read(&hrp
->hrp_nstarted
));
2533 static int ptlrpc_start_hr_threads(void)
2535 struct ptlrpc_hr_partition
*hrp
;
2539 cfs_percpt_for_each(hrp
, i
, ptlrpc_hr
.hr_partitions
) {
2542 for (j
= 0; j
< hrp
->hrp_nthrs
; j
++) {
2543 struct ptlrpc_hr_thread
*hrt
= &hrp
->hrp_thrs
[j
];
2544 rc
= PTR_ERR(kthread_run(ptlrpc_hr_main
,
2546 "ptlrpc_hr%02d_%03d",
2549 if (IS_ERR_VALUE(rc
))
2552 wait_event(ptlrpc_hr
.hr_waitq
,
2553 atomic_read(&hrp
->hrp_nstarted
) == j
);
2554 if (!IS_ERR_VALUE(rc
))
2557 CERROR("Reply handling thread %d:%d Failed on starting: "
2558 "rc = %d\n", i
, j
, rc
);
2559 ptlrpc_stop_hr_threads();
2565 static void ptlrpc_svcpt_stop_threads(struct ptlrpc_service_part
*svcpt
)
2567 struct l_wait_info lwi
= { 0 };
2568 struct ptlrpc_thread
*thread
;
2571 CDEBUG(D_INFO
, "Stopping threads for service %s\n",
2572 svcpt
->scp_service
->srv_name
);
2574 spin_lock(&svcpt
->scp_lock
);
2575 /* let the thread know that we would like it to stop asap */
2576 list_for_each_entry(thread
, &svcpt
->scp_threads
, t_link
) {
2577 CDEBUG(D_INFO
, "Stopping thread %s #%u\n",
2578 svcpt
->scp_service
->srv_thread_name
, thread
->t_id
);
2579 thread_add_flags(thread
, SVC_STOPPING
);
2582 wake_up_all(&svcpt
->scp_waitq
);
2584 while (!list_empty(&svcpt
->scp_threads
)) {
2585 thread
= list_entry(svcpt
->scp_threads
.next
,
2586 struct ptlrpc_thread
, t_link
);
2587 if (thread_is_stopped(thread
)) {
2588 list_del(&thread
->t_link
);
2589 list_add(&thread
->t_link
, &zombie
);
2592 spin_unlock(&svcpt
->scp_lock
);
2594 CDEBUG(D_INFO
, "waiting for stopping-thread %s #%u\n",
2595 svcpt
->scp_service
->srv_thread_name
, thread
->t_id
);
2596 l_wait_event(thread
->t_ctl_waitq
,
2597 thread_is_stopped(thread
), &lwi
);
2599 spin_lock(&svcpt
->scp_lock
);
2602 spin_unlock(&svcpt
->scp_lock
);
2604 while (!list_empty(&zombie
)) {
2605 thread
= list_entry(zombie
.next
,
2606 struct ptlrpc_thread
, t_link
);
2607 list_del(&thread
->t_link
);
2608 OBD_FREE_PTR(thread
);
2613 * Stops all threads of a particular service \a svc
2615 void ptlrpc_stop_all_threads(struct ptlrpc_service
*svc
)
2617 struct ptlrpc_service_part
*svcpt
;
2620 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
2621 if (svcpt
->scp_service
!= NULL
)
2622 ptlrpc_svcpt_stop_threads(svcpt
);
2625 EXPORT_SYMBOL(ptlrpc_stop_all_threads
);
2627 int ptlrpc_start_threads(struct ptlrpc_service
*svc
)
2633 /* We require 2 threads min, see note in ptlrpc_server_handle_request */
2634 LASSERT(svc
->srv_nthrs_cpt_init
>= PTLRPC_NTHRS_INIT
);
2636 for (i
= 0; i
< svc
->srv_ncpts
; i
++) {
2637 for (j
= 0; j
< svc
->srv_nthrs_cpt_init
; j
++) {
2638 rc
= ptlrpc_start_thread(svc
->srv_parts
[i
], 1);
2644 /* We have enough threads, don't start more. b=15759 */
2651 CERROR("cannot start %s thread #%d_%d: rc %d\n",
2652 svc
->srv_thread_name
, i
, j
, rc
);
2653 ptlrpc_stop_all_threads(svc
);
2656 EXPORT_SYMBOL(ptlrpc_start_threads
);
2658 int ptlrpc_start_thread(struct ptlrpc_service_part
*svcpt
, int wait
)
2660 struct l_wait_info lwi
= { 0 };
2661 struct ptlrpc_thread
*thread
;
2662 struct ptlrpc_service
*svc
;
2665 LASSERT(svcpt
!= NULL
);
2667 svc
= svcpt
->scp_service
;
2669 CDEBUG(D_RPCTRACE
, "%s[%d] started %d min %d max %d\n",
2670 svc
->srv_name
, svcpt
->scp_cpt
, svcpt
->scp_nthrs_running
,
2671 svc
->srv_nthrs_cpt_init
, svc
->srv_nthrs_cpt_limit
);
2674 if (unlikely(svc
->srv_is_stopping
))
2677 if (!ptlrpc_threads_increasable(svcpt
) ||
2678 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS
) &&
2679 svcpt
->scp_nthrs_running
== svc
->srv_nthrs_cpt_init
- 1))
2682 OBD_CPT_ALLOC_PTR(thread
, svc
->srv_cptable
, svcpt
->scp_cpt
);
2685 init_waitqueue_head(&thread
->t_ctl_waitq
);
2687 spin_lock(&svcpt
->scp_lock
);
2688 if (!ptlrpc_threads_increasable(svcpt
)) {
2689 spin_unlock(&svcpt
->scp_lock
);
2690 OBD_FREE_PTR(thread
);
2694 if (svcpt
->scp_nthrs_starting
!= 0) {
2695 /* serialize starting because some modules (obdfilter)
2696 * might require unique and contiguous t_id */
2697 LASSERT(svcpt
->scp_nthrs_starting
== 1);
2698 spin_unlock(&svcpt
->scp_lock
);
2699 OBD_FREE_PTR(thread
);
2701 CDEBUG(D_INFO
, "Waiting for creating thread %s #%d\n",
2702 svc
->srv_thread_name
, svcpt
->scp_thr_nextid
);
2707 CDEBUG(D_INFO
, "Creating thread %s #%d race, retry later\n",
2708 svc
->srv_thread_name
, svcpt
->scp_thr_nextid
);
2712 svcpt
->scp_nthrs_starting
++;
2713 thread
->t_id
= svcpt
->scp_thr_nextid
++;
2714 thread_add_flags(thread
, SVC_STARTING
);
2715 thread
->t_svcpt
= svcpt
;
2717 list_add(&thread
->t_link
, &svcpt
->scp_threads
);
2718 spin_unlock(&svcpt
->scp_lock
);
2720 if (svcpt
->scp_cpt
>= 0) {
2721 snprintf(thread
->t_name
, PTLRPC_THR_NAME_LEN
, "%s%02d_%03d",
2722 svc
->srv_thread_name
, svcpt
->scp_cpt
, thread
->t_id
);
2724 snprintf(thread
->t_name
, PTLRPC_THR_NAME_LEN
, "%s_%04d",
2725 svc
->srv_thread_name
, thread
->t_id
);
2728 CDEBUG(D_RPCTRACE
, "starting thread '%s'\n", thread
->t_name
);
2729 rc
= PTR_ERR(kthread_run(ptlrpc_main
, thread
, thread
->t_name
));
2730 if (IS_ERR_VALUE(rc
)) {
2731 CERROR("cannot start thread '%s': rc %d\n",
2732 thread
->t_name
, rc
);
2733 spin_lock(&svcpt
->scp_lock
);
2734 --svcpt
->scp_nthrs_starting
;
2735 if (thread_is_stopping(thread
)) {
2736 /* this ptlrpc_thread is being hanled
2737 * by ptlrpc_svcpt_stop_threads now
2739 thread_add_flags(thread
, SVC_STOPPED
);
2740 wake_up(&thread
->t_ctl_waitq
);
2741 spin_unlock(&svcpt
->scp_lock
);
2743 list_del(&thread
->t_link
);
2744 spin_unlock(&svcpt
->scp_lock
);
2745 OBD_FREE_PTR(thread
);
2753 l_wait_event(thread
->t_ctl_waitq
,
2754 thread_is_running(thread
) || thread_is_stopped(thread
),
2757 rc
= thread_is_stopped(thread
) ? thread
->t_id
: 0;
2761 int ptlrpc_hr_init(void)
2764 struct ptlrpc_hr_partition
*hrp
;
2765 struct ptlrpc_hr_thread
*hrt
;
2771 memset(&ptlrpc_hr
, 0, sizeof(ptlrpc_hr
));
2772 ptlrpc_hr
.hr_cpt_table
= cfs_cpt_table
;
2774 ptlrpc_hr
.hr_partitions
= cfs_percpt_alloc(ptlrpc_hr
.hr_cpt_table
,
2776 if (ptlrpc_hr
.hr_partitions
== NULL
)
2779 init_waitqueue_head(&ptlrpc_hr
.hr_waitq
);
2781 cpumask_copy(&mask
, topology_thread_cpumask(0));
2782 weight
= cpus_weight(mask
);
2784 cfs_percpt_for_each(hrp
, i
, ptlrpc_hr
.hr_partitions
) {
2787 atomic_set(&hrp
->hrp_nstarted
, 0);
2788 atomic_set(&hrp
->hrp_nstopped
, 0);
2790 hrp
->hrp_nthrs
= cfs_cpt_weight(ptlrpc_hr
.hr_cpt_table
, i
);
2791 hrp
->hrp_nthrs
/= weight
;
2793 LASSERT(hrp
->hrp_nthrs
> 0);
2794 OBD_CPT_ALLOC(hrp
->hrp_thrs
, ptlrpc_hr
.hr_cpt_table
, i
,
2795 hrp
->hrp_nthrs
* sizeof(*hrt
));
2796 if (hrp
->hrp_thrs
== NULL
)
2797 GOTO(out
, rc
= -ENOMEM
);
2799 for (j
= 0; j
< hrp
->hrp_nthrs
; j
++) {
2800 hrt
= &hrp
->hrp_thrs
[j
];
2803 hrt
->hrt_partition
= hrp
;
2804 init_waitqueue_head(&hrt
->hrt_waitq
);
2805 spin_lock_init(&hrt
->hrt_lock
);
2806 INIT_LIST_HEAD(&hrt
->hrt_queue
);
2810 rc
= ptlrpc_start_hr_threads();
2817 void ptlrpc_hr_fini(void)
2819 struct ptlrpc_hr_partition
*hrp
;
2822 if (ptlrpc_hr
.hr_partitions
== NULL
)
2825 ptlrpc_stop_hr_threads();
2827 cfs_percpt_for_each(hrp
, i
, ptlrpc_hr
.hr_partitions
) {
2828 if (hrp
->hrp_thrs
!= NULL
) {
2829 OBD_FREE(hrp
->hrp_thrs
,
2830 hrp
->hrp_nthrs
* sizeof(hrp
->hrp_thrs
[0]));
2834 cfs_percpt_free(ptlrpc_hr
.hr_partitions
);
2835 ptlrpc_hr
.hr_partitions
= NULL
;
2840 * Wait until all already scheduled replies are processed.
2842 static void ptlrpc_wait_replies(struct ptlrpc_service_part
*svcpt
)
2846 struct l_wait_info lwi
= LWI_TIMEOUT(cfs_time_seconds(10),
2849 rc
= l_wait_event(svcpt
->scp_waitq
,
2850 atomic_read(&svcpt
->scp_nreps_difficult
) == 0, &lwi
);
2853 CWARN("Unexpectedly long timeout %s %p\n",
2854 svcpt
->scp_service
->srv_name
, svcpt
->scp_service
);
2859 ptlrpc_service_del_atimer(struct ptlrpc_service
*svc
)
2861 struct ptlrpc_service_part
*svcpt
;
2864 /* early disarm AT timer... */
2865 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
2866 if (svcpt
->scp_service
!= NULL
)
2867 cfs_timer_disarm(&svcpt
->scp_at_timer
);
2872 ptlrpc_service_unlink_rqbd(struct ptlrpc_service
*svc
)
2874 struct ptlrpc_service_part
*svcpt
;
2875 struct ptlrpc_request_buffer_desc
*rqbd
;
2876 struct l_wait_info lwi
;
2880 /* All history will be culled when the next request buffer is
2881 * freed in ptlrpc_service_purge_all() */
2882 svc
->srv_hist_nrqbds_cpt_max
= 0;
2884 rc
= LNetClearLazyPortal(svc
->srv_req_portal
);
2887 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
2888 if (svcpt
->scp_service
== NULL
)
2891 /* Unlink all the request buffers. This forces a 'final'
2892 * event with its 'unlink' flag set for each posted rqbd */
2893 list_for_each_entry(rqbd
, &svcpt
->scp_rqbd_posted
,
2895 rc
= LNetMDUnlink(rqbd
->rqbd_md_h
);
2896 LASSERT(rc
== 0 || rc
== -ENOENT
);
2900 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
2901 if (svcpt
->scp_service
== NULL
)
2904 /* Wait for the network to release any buffers
2905 * it's currently filling */
2906 spin_lock(&svcpt
->scp_lock
);
2907 while (svcpt
->scp_nrqbds_posted
!= 0) {
2908 spin_unlock(&svcpt
->scp_lock
);
2909 /* Network access will complete in finite time but
2910 * the HUGE timeout lets us CWARN for visibility
2911 * of sluggish NALs */
2912 lwi
= LWI_TIMEOUT_INTERVAL(
2913 cfs_time_seconds(LONG_UNLINK
),
2914 cfs_time_seconds(1), NULL
, NULL
);
2915 rc
= l_wait_event(svcpt
->scp_waitq
,
2916 svcpt
->scp_nrqbds_posted
== 0, &lwi
);
2917 if (rc
== -ETIMEDOUT
) {
2918 CWARN("Service %s waiting for "
2919 "request buffers\n",
2920 svcpt
->scp_service
->srv_name
);
2922 spin_lock(&svcpt
->scp_lock
);
2924 spin_unlock(&svcpt
->scp_lock
);
2929 ptlrpc_service_purge_all(struct ptlrpc_service
*svc
)
2931 struct ptlrpc_service_part
*svcpt
;
2932 struct ptlrpc_request_buffer_desc
*rqbd
;
2933 struct ptlrpc_request
*req
;
2934 struct ptlrpc_reply_state
*rs
;
2937 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
2938 if (svcpt
->scp_service
== NULL
)
2941 spin_lock(&svcpt
->scp_rep_lock
);
2942 while (!list_empty(&svcpt
->scp_rep_active
)) {
2943 rs
= list_entry(svcpt
->scp_rep_active
.next
,
2944 struct ptlrpc_reply_state
, rs_list
);
2945 spin_lock(&rs
->rs_lock
);
2946 ptlrpc_schedule_difficult_reply(rs
);
2947 spin_unlock(&rs
->rs_lock
);
2949 spin_unlock(&svcpt
->scp_rep_lock
);
2951 /* purge the request queue. NB No new replies (rqbds
2952 * all unlinked) and no service threads, so I'm the only
2953 * thread noodling the request queue now */
2954 while (!list_empty(&svcpt
->scp_req_incoming
)) {
2955 req
= list_entry(svcpt
->scp_req_incoming
.next
,
2956 struct ptlrpc_request
, rq_list
);
2958 list_del(&req
->rq_list
);
2959 svcpt
->scp_nreqs_incoming
--;
2960 ptlrpc_server_finish_request(svcpt
, req
);
2963 while (ptlrpc_server_request_pending(svcpt
, true)) {
2964 req
= ptlrpc_server_request_get(svcpt
, true);
2965 ptlrpc_server_finish_active_request(svcpt
, req
);
2968 LASSERT(list_empty(&svcpt
->scp_rqbd_posted
));
2969 LASSERT(svcpt
->scp_nreqs_incoming
== 0);
2970 LASSERT(svcpt
->scp_nreqs_active
== 0);
2971 /* history should have been culled by
2972 * ptlrpc_server_finish_request */
2973 LASSERT(svcpt
->scp_hist_nrqbds
== 0);
2975 /* Now free all the request buffers since nothing
2976 * references them any more... */
2978 while (!list_empty(&svcpt
->scp_rqbd_idle
)) {
2979 rqbd
= list_entry(svcpt
->scp_rqbd_idle
.next
,
2980 struct ptlrpc_request_buffer_desc
,
2982 ptlrpc_free_rqbd(rqbd
);
2984 ptlrpc_wait_replies(svcpt
);
2986 while (!list_empty(&svcpt
->scp_rep_idle
)) {
2987 rs
= list_entry(svcpt
->scp_rep_idle
.next
,
2988 struct ptlrpc_reply_state
,
2990 list_del(&rs
->rs_list
);
2991 OBD_FREE_LARGE(rs
, svc
->srv_max_reply_size
);
2997 ptlrpc_service_free(struct ptlrpc_service
*svc
)
2999 struct ptlrpc_service_part
*svcpt
;
3000 struct ptlrpc_at_array
*array
;
3003 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
3004 if (svcpt
->scp_service
== NULL
)
3007 /* In case somebody rearmed this in the meantime */
3008 cfs_timer_disarm(&svcpt
->scp_at_timer
);
3009 array
= &svcpt
->scp_at_array
;
3011 if (array
->paa_reqs_array
!= NULL
) {
3012 OBD_FREE(array
->paa_reqs_array
,
3013 sizeof(struct list_head
) * array
->paa_size
);
3014 array
->paa_reqs_array
= NULL
;
3017 if (array
->paa_reqs_count
!= NULL
) {
3018 OBD_FREE(array
->paa_reqs_count
,
3019 sizeof(__u32
) * array
->paa_size
);
3020 array
->paa_reqs_count
= NULL
;
3024 ptlrpc_service_for_each_part(svcpt
, i
, svc
)
3025 OBD_FREE_PTR(svcpt
);
3027 if (svc
->srv_cpts
!= NULL
)
3028 cfs_expr_list_values_free(svc
->srv_cpts
, svc
->srv_ncpts
);
3030 OBD_FREE(svc
, offsetof(struct ptlrpc_service
,
3031 srv_parts
[svc
->srv_ncpts
]));
3034 int ptlrpc_unregister_service(struct ptlrpc_service
*service
)
3036 CDEBUG(D_NET
, "%s: tearing down\n", service
->srv_name
);
3038 service
->srv_is_stopping
= 1;
3040 mutex_lock(&ptlrpc_all_services_mutex
);
3041 list_del_init(&service
->srv_list
);
3042 mutex_unlock(&ptlrpc_all_services_mutex
);
3044 ptlrpc_service_del_atimer(service
);
3045 ptlrpc_stop_all_threads(service
);
3047 ptlrpc_service_unlink_rqbd(service
);
3048 ptlrpc_service_purge_all(service
);
3049 ptlrpc_service_nrs_cleanup(service
);
3051 ptlrpc_lprocfs_unregister_service(service
);
3053 ptlrpc_service_free(service
);
3057 EXPORT_SYMBOL(ptlrpc_unregister_service
);
3060 * Returns 0 if the service is healthy.
3062 * Right now, it just checks to make sure that requests aren't languishing
3063 * in the queue. We'll use this health check to govern whether a node needs
3064 * to be shot, so it's intentionally non-aggressive. */
3065 int ptlrpc_svcpt_health_check(struct ptlrpc_service_part
*svcpt
)
3067 struct ptlrpc_request
*request
= NULL
;
3068 struct timeval right_now
;
3071 do_gettimeofday(&right_now
);
3073 spin_lock(&svcpt
->scp_req_lock
);
3074 /* How long has the next entry been waiting? */
3075 if (ptlrpc_server_high_pending(svcpt
, true))
3076 request
= ptlrpc_nrs_req_peek_nolock(svcpt
, true);
3077 else if (ptlrpc_server_normal_pending(svcpt
, true))
3078 request
= ptlrpc_nrs_req_peek_nolock(svcpt
, false);
3080 if (request
== NULL
) {
3081 spin_unlock(&svcpt
->scp_req_lock
);
3085 timediff
= cfs_timeval_sub(&right_now
, &request
->rq_arrival_time
, NULL
);
3086 spin_unlock(&svcpt
->scp_req_lock
);
3088 if ((timediff
/ ONE_MILLION
) >
3089 (AT_OFF
? obd_timeout
* 3 / 2 : at_max
)) {
3090 CERROR("%s: unhealthy - request has been waiting %lds\n",
3091 svcpt
->scp_service
->srv_name
, timediff
/ ONE_MILLION
);
3099 ptlrpc_service_health_check(struct ptlrpc_service
*svc
)
3101 struct ptlrpc_service_part
*svcpt
;
3107 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
3108 int rc
= ptlrpc_svcpt_health_check(svcpt
);
3115 EXPORT_SYMBOL(ptlrpc_service_health_check
);