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Unevictable LRU Page Statistics
[deliverable/linux.git] / fs / proc / proc_misc.c
1 /*
2 * linux/fs/proc/proc_misc.c
3 *
4 * linux/fs/proc/array.c
5 * Copyright (C) 1992 by Linus Torvalds
6 * based on ideas by Darren Senn
7 *
8 * This used to be the part of array.c. See the rest of history and credits
9 * there. I took this into a separate file and switched the thing to generic
10 * proc_file_inode_operations, leaving in array.c only per-process stuff.
11 * Inumbers allocation made dynamic (via create_proc_entry()). AV, May 1999.
12 *
13 * Changes:
14 * Fulton Green : Encapsulated position metric calculations.
15 * <kernel@FultonGreen.com>
16 */
17
18 #include <linux/types.h>
19 #include <linux/errno.h>
20 #include <linux/time.h>
21 #include <linux/kernel.h>
22 #include <linux/kernel_stat.h>
23 #include <linux/fs.h>
24 #include <linux/tty.h>
25 #include <linux/string.h>
26 #include <linux/mman.h>
27 #include <linux/quicklist.h>
28 #include <linux/proc_fs.h>
29 #include <linux/ioport.h>
30 #include <linux/mm.h>
31 #include <linux/mmzone.h>
32 #include <linux/pagemap.h>
33 #include <linux/interrupt.h>
34 #include <linux/swap.h>
35 #include <linux/slab.h>
36 #include <linux/genhd.h>
37 #include <linux/smp.h>
38 #include <linux/signal.h>
39 #include <linux/module.h>
40 #include <linux/init.h>
41 #include <linux/seq_file.h>
42 #include <linux/times.h>
43 #include <linux/profile.h>
44 #include <linux/utsname.h>
45 #include <linux/blkdev.h>
46 #include <linux/hugetlb.h>
47 #include <linux/jiffies.h>
48 #include <linux/vmalloc.h>
49 #include <linux/crash_dump.h>
50 #include <linux/pid_namespace.h>
51 #include <linux/bootmem.h>
52 #include <asm/uaccess.h>
53 #include <asm/pgtable.h>
54 #include <asm/io.h>
55 #include <asm/tlb.h>
56 #include <asm/div64.h>
57 #include "internal.h"
58
59 #define LOAD_INT(x) ((x) >> FSHIFT)
60 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
61 /*
62 * Warning: stuff below (imported functions) assumes that its output will fit
63 * into one page. For some of those functions it may be wrong. Moreover, we
64 * have a way to deal with that gracefully. Right now I used straightforward
65 * wrappers, but this needs further analysis wrt potential overflows.
66 */
67 extern int get_hardware_list(char *);
68 extern int get_stram_list(char *);
69 extern int get_exec_domain_list(char *);
70
71 static int proc_calc_metrics(char *page, char **start, off_t off,
72 int count, int *eof, int len)
73 {
74 if (len <= off+count) *eof = 1;
75 *start = page + off;
76 len -= off;
77 if (len>count) len = count;
78 if (len<0) len = 0;
79 return len;
80 }
81
82 static int loadavg_read_proc(char *page, char **start, off_t off,
83 int count, int *eof, void *data)
84 {
85 int a, b, c;
86 int len;
87 unsigned long seq;
88
89 do {
90 seq = read_seqbegin(&xtime_lock);
91 a = avenrun[0] + (FIXED_1/200);
92 b = avenrun[1] + (FIXED_1/200);
93 c = avenrun[2] + (FIXED_1/200);
94 } while (read_seqretry(&xtime_lock, seq));
95
96 len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
97 LOAD_INT(a), LOAD_FRAC(a),
98 LOAD_INT(b), LOAD_FRAC(b),
99 LOAD_INT(c), LOAD_FRAC(c),
100 nr_running(), nr_threads,
101 task_active_pid_ns(current)->last_pid);
102 return proc_calc_metrics(page, start, off, count, eof, len);
103 }
104
105 static int uptime_read_proc(char *page, char **start, off_t off,
106 int count, int *eof, void *data)
107 {
108 struct timespec uptime;
109 struct timespec idle;
110 int len;
111 cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
112
113 do_posix_clock_monotonic_gettime(&uptime);
114 monotonic_to_bootbased(&uptime);
115 cputime_to_timespec(idletime, &idle);
116 len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
117 (unsigned long) uptime.tv_sec,
118 (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
119 (unsigned long) idle.tv_sec,
120 (idle.tv_nsec / (NSEC_PER_SEC / 100)));
121
122 return proc_calc_metrics(page, start, off, count, eof, len);
123 }
124
125 int __attribute__((weak)) arch_report_meminfo(char *page)
126 {
127 return 0;
128 }
129
130 static int meminfo_read_proc(char *page, char **start, off_t off,
131 int count, int *eof, void *data)
132 {
133 struct sysinfo i;
134 int len;
135 unsigned long committed;
136 unsigned long allowed;
137 struct vmalloc_info vmi;
138 long cached;
139 unsigned long pages[NR_LRU_LISTS];
140 int lru;
141
142 /*
143 * display in kilobytes.
144 */
145 #define K(x) ((x) << (PAGE_SHIFT - 10))
146 si_meminfo(&i);
147 si_swapinfo(&i);
148 committed = atomic_long_read(&vm_committed_space);
149 allowed = ((totalram_pages - hugetlb_total_pages())
150 * sysctl_overcommit_ratio / 100) + total_swap_pages;
151
152 cached = global_page_state(NR_FILE_PAGES) -
153 total_swapcache_pages - i.bufferram;
154 if (cached < 0)
155 cached = 0;
156
157 get_vmalloc_info(&vmi);
158
159 for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
160 pages[lru] = global_page_state(NR_LRU_BASE + lru);
161
162 /*
163 * Tagged format, for easy grepping and expansion.
164 */
165 len = sprintf(page,
166 "MemTotal: %8lu kB\n"
167 "MemFree: %8lu kB\n"
168 "Buffers: %8lu kB\n"
169 "Cached: %8lu kB\n"
170 "SwapCached: %8lu kB\n"
171 "Active: %8lu kB\n"
172 "Inactive: %8lu kB\n"
173 "Active(anon): %8lu kB\n"
174 "Inactive(anon): %8lu kB\n"
175 "Active(file): %8lu kB\n"
176 "Inactive(file): %8lu kB\n"
177 #ifdef CONFIG_UNEVICTABLE_LRU
178 "Unevictable: %8lu kB\n"
179 #endif
180 #ifdef CONFIG_HIGHMEM
181 "HighTotal: %8lu kB\n"
182 "HighFree: %8lu kB\n"
183 "LowTotal: %8lu kB\n"
184 "LowFree: %8lu kB\n"
185 #endif
186 "SwapTotal: %8lu kB\n"
187 "SwapFree: %8lu kB\n"
188 "Dirty: %8lu kB\n"
189 "Writeback: %8lu kB\n"
190 "AnonPages: %8lu kB\n"
191 "Mapped: %8lu kB\n"
192 "Slab: %8lu kB\n"
193 "SReclaimable: %8lu kB\n"
194 "SUnreclaim: %8lu kB\n"
195 "PageTables: %8lu kB\n"
196 #ifdef CONFIG_QUICKLIST
197 "Quicklists: %8lu kB\n"
198 #endif
199 "NFS_Unstable: %8lu kB\n"
200 "Bounce: %8lu kB\n"
201 "WritebackTmp: %8lu kB\n"
202 "CommitLimit: %8lu kB\n"
203 "Committed_AS: %8lu kB\n"
204 "VmallocTotal: %8lu kB\n"
205 "VmallocUsed: %8lu kB\n"
206 "VmallocChunk: %8lu kB\n",
207 K(i.totalram),
208 K(i.freeram),
209 K(i.bufferram),
210 K(cached),
211 K(total_swapcache_pages),
212 K(pages[LRU_ACTIVE_ANON] + pages[LRU_ACTIVE_FILE]),
213 K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]),
214 K(pages[LRU_ACTIVE_ANON]),
215 K(pages[LRU_INACTIVE_ANON]),
216 K(pages[LRU_ACTIVE_FILE]),
217 K(pages[LRU_INACTIVE_FILE]),
218 #ifdef CONFIG_UNEVICTABLE_LRU
219 K(pages[LRU_UNEVICTABLE]),
220 #endif
221 #ifdef CONFIG_HIGHMEM
222 K(i.totalhigh),
223 K(i.freehigh),
224 K(i.totalram-i.totalhigh),
225 K(i.freeram-i.freehigh),
226 #endif
227 K(i.totalswap),
228 K(i.freeswap),
229 K(global_page_state(NR_FILE_DIRTY)),
230 K(global_page_state(NR_WRITEBACK)),
231 K(global_page_state(NR_ANON_PAGES)),
232 K(global_page_state(NR_FILE_MAPPED)),
233 K(global_page_state(NR_SLAB_RECLAIMABLE) +
234 global_page_state(NR_SLAB_UNRECLAIMABLE)),
235 K(global_page_state(NR_SLAB_RECLAIMABLE)),
236 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
237 K(global_page_state(NR_PAGETABLE)),
238 #ifdef CONFIG_QUICKLIST
239 K(quicklist_total_size()),
240 #endif
241 K(global_page_state(NR_UNSTABLE_NFS)),
242 K(global_page_state(NR_BOUNCE)),
243 K(global_page_state(NR_WRITEBACK_TEMP)),
244 K(allowed),
245 K(committed),
246 (unsigned long)VMALLOC_TOTAL >> 10,
247 vmi.used >> 10,
248 vmi.largest_chunk >> 10
249 );
250
251 len += hugetlb_report_meminfo(page + len);
252
253 len += arch_report_meminfo(page + len);
254
255 return proc_calc_metrics(page, start, off, count, eof, len);
256 #undef K
257 }
258
259 static int fragmentation_open(struct inode *inode, struct file *file)
260 {
261 (void)inode;
262 return seq_open(file, &fragmentation_op);
263 }
264
265 static const struct file_operations fragmentation_file_operations = {
266 .open = fragmentation_open,
267 .read = seq_read,
268 .llseek = seq_lseek,
269 .release = seq_release,
270 };
271
272 static int pagetypeinfo_open(struct inode *inode, struct file *file)
273 {
274 return seq_open(file, &pagetypeinfo_op);
275 }
276
277 static const struct file_operations pagetypeinfo_file_ops = {
278 .open = pagetypeinfo_open,
279 .read = seq_read,
280 .llseek = seq_lseek,
281 .release = seq_release,
282 };
283
284 static int zoneinfo_open(struct inode *inode, struct file *file)
285 {
286 return seq_open(file, &zoneinfo_op);
287 }
288
289 static const struct file_operations proc_zoneinfo_file_operations = {
290 .open = zoneinfo_open,
291 .read = seq_read,
292 .llseek = seq_lseek,
293 .release = seq_release,
294 };
295
296 static int version_read_proc(char *page, char **start, off_t off,
297 int count, int *eof, void *data)
298 {
299 int len;
300
301 len = snprintf(page, PAGE_SIZE, linux_proc_banner,
302 utsname()->sysname,
303 utsname()->release,
304 utsname()->version);
305 return proc_calc_metrics(page, start, off, count, eof, len);
306 }
307
308 extern const struct seq_operations cpuinfo_op;
309 static int cpuinfo_open(struct inode *inode, struct file *file)
310 {
311 return seq_open(file, &cpuinfo_op);
312 }
313
314 static const struct file_operations proc_cpuinfo_operations = {
315 .open = cpuinfo_open,
316 .read = seq_read,
317 .llseek = seq_lseek,
318 .release = seq_release,
319 };
320
321 static int devinfo_show(struct seq_file *f, void *v)
322 {
323 int i = *(loff_t *) v;
324
325 if (i < CHRDEV_MAJOR_HASH_SIZE) {
326 if (i == 0)
327 seq_printf(f, "Character devices:\n");
328 chrdev_show(f, i);
329 }
330 #ifdef CONFIG_BLOCK
331 else {
332 i -= CHRDEV_MAJOR_HASH_SIZE;
333 if (i == 0)
334 seq_printf(f, "\nBlock devices:\n");
335 blkdev_show(f, i);
336 }
337 #endif
338 return 0;
339 }
340
341 static void *devinfo_start(struct seq_file *f, loff_t *pos)
342 {
343 if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
344 return pos;
345 return NULL;
346 }
347
348 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
349 {
350 (*pos)++;
351 if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
352 return NULL;
353 return pos;
354 }
355
356 static void devinfo_stop(struct seq_file *f, void *v)
357 {
358 /* Nothing to do */
359 }
360
361 static const struct seq_operations devinfo_ops = {
362 .start = devinfo_start,
363 .next = devinfo_next,
364 .stop = devinfo_stop,
365 .show = devinfo_show
366 };
367
368 static int devinfo_open(struct inode *inode, struct file *filp)
369 {
370 return seq_open(filp, &devinfo_ops);
371 }
372
373 static const struct file_operations proc_devinfo_operations = {
374 .open = devinfo_open,
375 .read = seq_read,
376 .llseek = seq_lseek,
377 .release = seq_release,
378 };
379
380 static int vmstat_open(struct inode *inode, struct file *file)
381 {
382 return seq_open(file, &vmstat_op);
383 }
384 static const struct file_operations proc_vmstat_file_operations = {
385 .open = vmstat_open,
386 .read = seq_read,
387 .llseek = seq_lseek,
388 .release = seq_release,
389 };
390
391 #ifdef CONFIG_PROC_HARDWARE
392 static int hardware_read_proc(char *page, char **start, off_t off,
393 int count, int *eof, void *data)
394 {
395 int len = get_hardware_list(page);
396 return proc_calc_metrics(page, start, off, count, eof, len);
397 }
398 #endif
399
400 #ifdef CONFIG_STRAM_PROC
401 static int stram_read_proc(char *page, char **start, off_t off,
402 int count, int *eof, void *data)
403 {
404 int len = get_stram_list(page);
405 return proc_calc_metrics(page, start, off, count, eof, len);
406 }
407 #endif
408
409 #ifdef CONFIG_BLOCK
410 static int partitions_open(struct inode *inode, struct file *file)
411 {
412 return seq_open(file, &partitions_op);
413 }
414 static const struct file_operations proc_partitions_operations = {
415 .open = partitions_open,
416 .read = seq_read,
417 .llseek = seq_lseek,
418 .release = seq_release,
419 };
420
421 static int diskstats_open(struct inode *inode, struct file *file)
422 {
423 return seq_open(file, &diskstats_op);
424 }
425 static const struct file_operations proc_diskstats_operations = {
426 .open = diskstats_open,
427 .read = seq_read,
428 .llseek = seq_lseek,
429 .release = seq_release,
430 };
431 #endif
432
433 #ifdef CONFIG_MODULES
434 extern const struct seq_operations modules_op;
435 static int modules_open(struct inode *inode, struct file *file)
436 {
437 return seq_open(file, &modules_op);
438 }
439 static const struct file_operations proc_modules_operations = {
440 .open = modules_open,
441 .read = seq_read,
442 .llseek = seq_lseek,
443 .release = seq_release,
444 };
445 #endif
446
447 #ifdef CONFIG_SLABINFO
448 static int slabinfo_open(struct inode *inode, struct file *file)
449 {
450 return seq_open(file, &slabinfo_op);
451 }
452 static const struct file_operations proc_slabinfo_operations = {
453 .open = slabinfo_open,
454 .read = seq_read,
455 .write = slabinfo_write,
456 .llseek = seq_lseek,
457 .release = seq_release,
458 };
459
460 #ifdef CONFIG_DEBUG_SLAB_LEAK
461 extern const struct seq_operations slabstats_op;
462 static int slabstats_open(struct inode *inode, struct file *file)
463 {
464 unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
465 int ret = -ENOMEM;
466 if (n) {
467 ret = seq_open(file, &slabstats_op);
468 if (!ret) {
469 struct seq_file *m = file->private_data;
470 *n = PAGE_SIZE / (2 * sizeof(unsigned long));
471 m->private = n;
472 n = NULL;
473 }
474 kfree(n);
475 }
476 return ret;
477 }
478
479 static const struct file_operations proc_slabstats_operations = {
480 .open = slabstats_open,
481 .read = seq_read,
482 .llseek = seq_lseek,
483 .release = seq_release_private,
484 };
485 #endif
486 #endif
487
488 #ifdef CONFIG_MMU
489 static int vmalloc_open(struct inode *inode, struct file *file)
490 {
491 unsigned int *ptr = NULL;
492 int ret;
493
494 if (NUMA_BUILD)
495 ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
496 ret = seq_open(file, &vmalloc_op);
497 if (!ret) {
498 struct seq_file *m = file->private_data;
499 m->private = ptr;
500 } else
501 kfree(ptr);
502 return ret;
503 }
504
505 static const struct file_operations proc_vmalloc_operations = {
506 .open = vmalloc_open,
507 .read = seq_read,
508 .llseek = seq_lseek,
509 .release = seq_release_private,
510 };
511 #endif
512
513 #ifndef arch_irq_stat_cpu
514 #define arch_irq_stat_cpu(cpu) 0
515 #endif
516 #ifndef arch_irq_stat
517 #define arch_irq_stat() 0
518 #endif
519
520 static int show_stat(struct seq_file *p, void *v)
521 {
522 int i;
523 unsigned long jif;
524 cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
525 cputime64_t guest;
526 u64 sum = 0;
527 struct timespec boottime;
528 unsigned int *per_irq_sum;
529
530 per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
531 if (!per_irq_sum)
532 return -ENOMEM;
533
534 user = nice = system = idle = iowait =
535 irq = softirq = steal = cputime64_zero;
536 guest = cputime64_zero;
537 getboottime(&boottime);
538 jif = boottime.tv_sec;
539
540 for_each_possible_cpu(i) {
541 int j;
542
543 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
544 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
545 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
546 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
547 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
548 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
549 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
550 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
551 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
552 for (j = 0; j < NR_IRQS; j++) {
553 unsigned int temp = kstat_cpu(i).irqs[j];
554 sum += temp;
555 per_irq_sum[j] += temp;
556 }
557 sum += arch_irq_stat_cpu(i);
558 }
559 sum += arch_irq_stat();
560
561 seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
562 (unsigned long long)cputime64_to_clock_t(user),
563 (unsigned long long)cputime64_to_clock_t(nice),
564 (unsigned long long)cputime64_to_clock_t(system),
565 (unsigned long long)cputime64_to_clock_t(idle),
566 (unsigned long long)cputime64_to_clock_t(iowait),
567 (unsigned long long)cputime64_to_clock_t(irq),
568 (unsigned long long)cputime64_to_clock_t(softirq),
569 (unsigned long long)cputime64_to_clock_t(steal),
570 (unsigned long long)cputime64_to_clock_t(guest));
571 for_each_online_cpu(i) {
572
573 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
574 user = kstat_cpu(i).cpustat.user;
575 nice = kstat_cpu(i).cpustat.nice;
576 system = kstat_cpu(i).cpustat.system;
577 idle = kstat_cpu(i).cpustat.idle;
578 iowait = kstat_cpu(i).cpustat.iowait;
579 irq = kstat_cpu(i).cpustat.irq;
580 softirq = kstat_cpu(i).cpustat.softirq;
581 steal = kstat_cpu(i).cpustat.steal;
582 guest = kstat_cpu(i).cpustat.guest;
583 seq_printf(p,
584 "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
585 i,
586 (unsigned long long)cputime64_to_clock_t(user),
587 (unsigned long long)cputime64_to_clock_t(nice),
588 (unsigned long long)cputime64_to_clock_t(system),
589 (unsigned long long)cputime64_to_clock_t(idle),
590 (unsigned long long)cputime64_to_clock_t(iowait),
591 (unsigned long long)cputime64_to_clock_t(irq),
592 (unsigned long long)cputime64_to_clock_t(softirq),
593 (unsigned long long)cputime64_to_clock_t(steal),
594 (unsigned long long)cputime64_to_clock_t(guest));
595 }
596 seq_printf(p, "intr %llu", (unsigned long long)sum);
597
598 for (i = 0; i < NR_IRQS; i++)
599 seq_printf(p, " %u", per_irq_sum[i]);
600
601 seq_printf(p,
602 "\nctxt %llu\n"
603 "btime %lu\n"
604 "processes %lu\n"
605 "procs_running %lu\n"
606 "procs_blocked %lu\n",
607 nr_context_switches(),
608 (unsigned long)jif,
609 total_forks,
610 nr_running(),
611 nr_iowait());
612
613 kfree(per_irq_sum);
614 return 0;
615 }
616
617 static int stat_open(struct inode *inode, struct file *file)
618 {
619 unsigned size = 4096 * (1 + num_possible_cpus() / 32);
620 char *buf;
621 struct seq_file *m;
622 int res;
623
624 /* don't ask for more than the kmalloc() max size, currently 128 KB */
625 if (size > 128 * 1024)
626 size = 128 * 1024;
627 buf = kmalloc(size, GFP_KERNEL);
628 if (!buf)
629 return -ENOMEM;
630
631 res = single_open(file, show_stat, NULL);
632 if (!res) {
633 m = file->private_data;
634 m->buf = buf;
635 m->size = size;
636 } else
637 kfree(buf);
638 return res;
639 }
640 static const struct file_operations proc_stat_operations = {
641 .open = stat_open,
642 .read = seq_read,
643 .llseek = seq_lseek,
644 .release = single_release,
645 };
646
647 /*
648 * /proc/interrupts
649 */
650 static void *int_seq_start(struct seq_file *f, loff_t *pos)
651 {
652 return (*pos <= NR_IRQS) ? pos : NULL;
653 }
654
655 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
656 {
657 (*pos)++;
658 if (*pos > NR_IRQS)
659 return NULL;
660 return pos;
661 }
662
663 static void int_seq_stop(struct seq_file *f, void *v)
664 {
665 /* Nothing to do */
666 }
667
668
669 static const struct seq_operations int_seq_ops = {
670 .start = int_seq_start,
671 .next = int_seq_next,
672 .stop = int_seq_stop,
673 .show = show_interrupts
674 };
675
676 static int interrupts_open(struct inode *inode, struct file *filp)
677 {
678 return seq_open(filp, &int_seq_ops);
679 }
680
681 static const struct file_operations proc_interrupts_operations = {
682 .open = interrupts_open,
683 .read = seq_read,
684 .llseek = seq_lseek,
685 .release = seq_release,
686 };
687
688 static int filesystems_read_proc(char *page, char **start, off_t off,
689 int count, int *eof, void *data)
690 {
691 int len = get_filesystem_list(page);
692 return proc_calc_metrics(page, start, off, count, eof, len);
693 }
694
695 static int cmdline_read_proc(char *page, char **start, off_t off,
696 int count, int *eof, void *data)
697 {
698 int len;
699
700 len = sprintf(page, "%s\n", saved_command_line);
701 return proc_calc_metrics(page, start, off, count, eof, len);
702 }
703
704 #ifdef CONFIG_FILE_LOCKING
705 static int locks_open(struct inode *inode, struct file *filp)
706 {
707 return seq_open(filp, &locks_seq_operations);
708 }
709
710 static const struct file_operations proc_locks_operations = {
711 .open = locks_open,
712 .read = seq_read,
713 .llseek = seq_lseek,
714 .release = seq_release,
715 };
716 #endif /* CONFIG_FILE_LOCKING */
717
718 static int execdomains_read_proc(char *page, char **start, off_t off,
719 int count, int *eof, void *data)
720 {
721 int len = get_exec_domain_list(page);
722 return proc_calc_metrics(page, start, off, count, eof, len);
723 }
724
725 #ifdef CONFIG_PROC_PAGE_MONITOR
726 #define KPMSIZE sizeof(u64)
727 #define KPMMASK (KPMSIZE - 1)
728 /* /proc/kpagecount - an array exposing page counts
729 *
730 * Each entry is a u64 representing the corresponding
731 * physical page count.
732 */
733 static ssize_t kpagecount_read(struct file *file, char __user *buf,
734 size_t count, loff_t *ppos)
735 {
736 u64 __user *out = (u64 __user *)buf;
737 struct page *ppage;
738 unsigned long src = *ppos;
739 unsigned long pfn;
740 ssize_t ret = 0;
741 u64 pcount;
742
743 pfn = src / KPMSIZE;
744 count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
745 if (src & KPMMASK || count & KPMMASK)
746 return -EINVAL;
747
748 while (count > 0) {
749 ppage = NULL;
750 if (pfn_valid(pfn))
751 ppage = pfn_to_page(pfn);
752 pfn++;
753 if (!ppage)
754 pcount = 0;
755 else
756 pcount = page_mapcount(ppage);
757
758 if (put_user(pcount, out++)) {
759 ret = -EFAULT;
760 break;
761 }
762
763 count -= KPMSIZE;
764 }
765
766 *ppos += (char __user *)out - buf;
767 if (!ret)
768 ret = (char __user *)out - buf;
769 return ret;
770 }
771
772 static struct file_operations proc_kpagecount_operations = {
773 .llseek = mem_lseek,
774 .read = kpagecount_read,
775 };
776
777 /* /proc/kpageflags - an array exposing page flags
778 *
779 * Each entry is a u64 representing the corresponding
780 * physical page flags.
781 */
782
783 /* These macros are used to decouple internal flags from exported ones */
784
785 #define KPF_LOCKED 0
786 #define KPF_ERROR 1
787 #define KPF_REFERENCED 2
788 #define KPF_UPTODATE 3
789 #define KPF_DIRTY 4
790 #define KPF_LRU 5
791 #define KPF_ACTIVE 6
792 #define KPF_SLAB 7
793 #define KPF_WRITEBACK 8
794 #define KPF_RECLAIM 9
795 #define KPF_BUDDY 10
796
797 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
798
799 static ssize_t kpageflags_read(struct file *file, char __user *buf,
800 size_t count, loff_t *ppos)
801 {
802 u64 __user *out = (u64 __user *)buf;
803 struct page *ppage;
804 unsigned long src = *ppos;
805 unsigned long pfn;
806 ssize_t ret = 0;
807 u64 kflags, uflags;
808
809 pfn = src / KPMSIZE;
810 count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
811 if (src & KPMMASK || count & KPMMASK)
812 return -EINVAL;
813
814 while (count > 0) {
815 ppage = NULL;
816 if (pfn_valid(pfn))
817 ppage = pfn_to_page(pfn);
818 pfn++;
819 if (!ppage)
820 kflags = 0;
821 else
822 kflags = ppage->flags;
823
824 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
825 kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
826 kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
827 kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
828 kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
829 kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
830 kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
831 kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
832 kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
833 kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
834 kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
835
836 if (put_user(uflags, out++)) {
837 ret = -EFAULT;
838 break;
839 }
840
841 count -= KPMSIZE;
842 }
843
844 *ppos += (char __user *)out - buf;
845 if (!ret)
846 ret = (char __user *)out - buf;
847 return ret;
848 }
849
850 static struct file_operations proc_kpageflags_operations = {
851 .llseek = mem_lseek,
852 .read = kpageflags_read,
853 };
854 #endif /* CONFIG_PROC_PAGE_MONITOR */
855
856 struct proc_dir_entry *proc_root_kcore;
857
858 void __init proc_misc_init(void)
859 {
860 static struct {
861 char *name;
862 int (*read_proc)(char*,char**,off_t,int,int*,void*);
863 } *p, simple_ones[] = {
864 {"loadavg", loadavg_read_proc},
865 {"uptime", uptime_read_proc},
866 {"meminfo", meminfo_read_proc},
867 {"version", version_read_proc},
868 #ifdef CONFIG_PROC_HARDWARE
869 {"hardware", hardware_read_proc},
870 #endif
871 #ifdef CONFIG_STRAM_PROC
872 {"stram", stram_read_proc},
873 #endif
874 {"filesystems", filesystems_read_proc},
875 {"cmdline", cmdline_read_proc},
876 {"execdomains", execdomains_read_proc},
877 {NULL,}
878 };
879 for (p = simple_ones; p->name; p++)
880 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
881
882 proc_symlink("mounts", NULL, "self/mounts");
883
884 /* And now for trickier ones */
885 #ifdef CONFIG_PRINTK
886 proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
887 #endif
888 #ifdef CONFIG_FILE_LOCKING
889 proc_create("locks", 0, NULL, &proc_locks_operations);
890 #endif
891 proc_create("devices", 0, NULL, &proc_devinfo_operations);
892 proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
893 #ifdef CONFIG_BLOCK
894 proc_create("partitions", 0, NULL, &proc_partitions_operations);
895 #endif
896 proc_create("stat", 0, NULL, &proc_stat_operations);
897 proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
898 #ifdef CONFIG_SLABINFO
899 proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
900 #ifdef CONFIG_DEBUG_SLAB_LEAK
901 proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
902 #endif
903 #endif
904 #ifdef CONFIG_MMU
905 proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
906 #endif
907 proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
908 proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
909 proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
910 proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
911 #ifdef CONFIG_BLOCK
912 proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
913 #endif
914 #ifdef CONFIG_MODULES
915 proc_create("modules", 0, NULL, &proc_modules_operations);
916 #endif
917 #ifdef CONFIG_SCHEDSTATS
918 proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
919 #endif
920 #ifdef CONFIG_PROC_KCORE
921 proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
922 if (proc_root_kcore)
923 proc_root_kcore->size =
924 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
925 #endif
926 #ifdef CONFIG_PROC_PAGE_MONITOR
927 proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
928 proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
929 #endif
930 #ifdef CONFIG_PROC_VMCORE
931 proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
932 #endif
933 }
Linux kernel - Deliverables
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