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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Neil Horman7170be52006-01-14 13:20:38 -080023#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/tty.h>
25#include <linux/string.h>
26#include <linux/mman.h>
27#include <linux/proc_fs.h>
28#include <linux/ioport.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/mm.h>
30#include <linux/mmzone.h>
31#include <linux/pagemap.h>
32#include <linux/swap.h>
33#include <linux/slab.h>
34#include <linux/smp.h>
35#include <linux/signal.h>
36#include <linux/module.h>
37#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <linux/seq_file.h>
39#include <linux/times.h>
40#include <linux/profile.h>
Andrew Morton7bf65382006-12-08 02:41:14 -080041#include <linux/utsname.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <linux/blkdev.h>
43#include <linux/hugetlb.h>
44#include <linux/jiffies.h>
45#include <linux/sysrq.h>
46#include <linux/vmalloc.h>
Vivek Goyal666bfdd2005-06-25 14:58:21 -070047#include <linux/crash_dump.h>
Sukadev Bhattiprolu61a58c62006-12-08 02:37:58 -080048#include <linux/pid_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <asm/uaccess.h>
50#include <asm/pgtable.h>
51#include <asm/io.h>
52#include <asm/tlb.h>
53#include <asm/div64.h>
54#include "internal.h"
55
56#define LOAD_INT(x) ((x) >> FSHIFT)
57#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
58/*
59 * Warning: stuff below (imported functions) assumes that its output will fit
60 * into one page. For some of those functions it may be wrong. Moreover, we
61 * have a way to deal with that gracefully. Right now I used straightforward
62 * wrappers, but this needs further analysis wrt potential overflows.
63 */
64extern int get_hardware_list(char *);
65extern int get_stram_list(char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066extern int get_filesystem_list(char *);
67extern int get_exec_domain_list(char *);
68extern int get_dma_list(char *);
69extern int get_locks_status (char *, char **, off_t, int);
70
71static 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
82static 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
88 a = avenrun[0] + (FIXED_1/200);
89 b = avenrun[1] + (FIXED_1/200);
90 c = avenrun[2] + (FIXED_1/200);
91 len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
92 LOAD_INT(a), LOAD_FRAC(a),
93 LOAD_INT(b), LOAD_FRAC(b),
94 LOAD_INT(c), LOAD_FRAC(c),
Cedric Le Goater6cc1b222006-12-08 02:38:00 -080095 nr_running(), nr_threads, current->nsproxy->pid_ns->last_pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 return proc_calc_metrics(page, start, off, count, eof, len);
97}
98
99static int uptime_read_proc(char *page, char **start, off_t off,
100 int count, int *eof, void *data)
101{
102 struct timespec uptime;
103 struct timespec idle;
104 int len;
105 cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
106
107 do_posix_clock_monotonic_gettime(&uptime);
108 cputime_to_timespec(idletime, &idle);
109 len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
110 (unsigned long) uptime.tv_sec,
111 (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
112 (unsigned long) idle.tv_sec,
113 (idle.tv_nsec / (NSEC_PER_SEC / 100)));
114
115 return proc_calc_metrics(page, start, off, count, eof, len);
116}
117
118static int meminfo_read_proc(char *page, char **start, off_t off,
119 int count, int *eof, void *data)
120{
121 struct sysinfo i;
122 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 unsigned long committed;
124 unsigned long allowed;
125 struct vmalloc_info vmi;
Martin Hicks4c4c4022005-04-16 15:24:08 -0700126 long cached;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128/*
129 * display in kilobytes.
130 */
131#define K(x) ((x) << (PAGE_SHIFT - 10))
132 si_meminfo(&i);
133 si_swapinfo(&i);
134 committed = atomic_read(&vm_committed_space);
135 allowed = ((totalram_pages - hugetlb_total_pages())
136 * sysctl_overcommit_ratio / 100) + total_swap_pages;
137
Christoph Lameter347ce432006-06-30 01:55:35 -0700138 cached = global_page_state(NR_FILE_PAGES) -
139 total_swapcache_pages - i.bufferram;
Martin Hicks4c4c4022005-04-16 15:24:08 -0700140 if (cached < 0)
141 cached = 0;
142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 get_vmalloc_info(&vmi);
144
145 /*
146 * Tagged format, for easy grepping and expansion.
147 */
148 len = sprintf(page,
149 "MemTotal: %8lu kB\n"
150 "MemFree: %8lu kB\n"
151 "Buffers: %8lu kB\n"
152 "Cached: %8lu kB\n"
153 "SwapCached: %8lu kB\n"
154 "Active: %8lu kB\n"
155 "Inactive: %8lu kB\n"
Christoph Lameter182e8e22006-09-25 23:31:10 -0700156#ifdef CONFIG_HIGHMEM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 "HighTotal: %8lu kB\n"
158 "HighFree: %8lu kB\n"
159 "LowTotal: %8lu kB\n"
160 "LowFree: %8lu kB\n"
Christoph Lameter182e8e22006-09-25 23:31:10 -0700161#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 "SwapTotal: %8lu kB\n"
163 "SwapFree: %8lu kB\n"
164 "Dirty: %8lu kB\n"
165 "Writeback: %8lu kB\n"
Christoph Lameterf3dbd342006-06-30 01:55:36 -0700166 "AnonPages: %8lu kB\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 "Mapped: %8lu kB\n"
168 "Slab: %8lu kB\n"
Christoph Lameter972d1a72006-09-25 23:31:51 -0700169 "SReclaimable: %8lu kB\n"
170 "SUnreclaim: %8lu kB\n"
Christoph Lameterdf849a12006-06-30 01:55:38 -0700171 "PageTables: %8lu kB\n"
Andrew Mortonf5ef68d2006-08-27 01:23:58 -0700172 "NFS_Unstable: %8lu kB\n"
Christoph Lameterd2c5e302006-06-30 01:55:41 -0700173 "Bounce: %8lu kB\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 "CommitLimit: %8lu kB\n"
175 "Committed_AS: %8lu kB\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 "VmallocTotal: %8lu kB\n"
177 "VmallocUsed: %8lu kB\n"
178 "VmallocChunk: %8lu kB\n",
179 K(i.totalram),
180 K(i.freeram),
181 K(i.bufferram),
Martin Hicks4c4c4022005-04-16 15:24:08 -0700182 K(cached),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 K(total_swapcache_pages),
Christoph Lameter65e458d42007-02-10 01:43:05 -0800184 K(global_page_state(NR_ACTIVE)),
185 K(global_page_state(NR_INACTIVE)),
Christoph Lameter182e8e22006-09-25 23:31:10 -0700186#ifdef CONFIG_HIGHMEM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 K(i.totalhigh),
188 K(i.freehigh),
189 K(i.totalram-i.totalhigh),
190 K(i.freeram-i.freehigh),
Christoph Lameter182e8e22006-09-25 23:31:10 -0700191#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 K(i.totalswap),
193 K(i.freeswap),
Christoph Lameterb1e7a8f2006-06-30 01:55:39 -0700194 K(global_page_state(NR_FILE_DIRTY)),
Christoph Lameterce866b32006-06-30 01:55:40 -0700195 K(global_page_state(NR_WRITEBACK)),
Christoph Lameterf3dbd342006-06-30 01:55:36 -0700196 K(global_page_state(NR_ANON_PAGES)),
Christoph Lameter65ba55f2006-06-30 01:55:34 -0700197 K(global_page_state(NR_FILE_MAPPED)),
Christoph Lameter972d1a72006-09-25 23:31:51 -0700198 K(global_page_state(NR_SLAB_RECLAIMABLE) +
199 global_page_state(NR_SLAB_UNRECLAIMABLE)),
200 K(global_page_state(NR_SLAB_RECLAIMABLE)),
201 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
Christoph Lameterdf849a12006-06-30 01:55:38 -0700202 K(global_page_state(NR_PAGETABLE)),
Christoph Lameterfd39fc82006-06-30 01:55:40 -0700203 K(global_page_state(NR_UNSTABLE_NFS)),
Christoph Lameterd2c5e302006-06-30 01:55:41 -0700204 K(global_page_state(NR_BOUNCE)),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 K(allowed),
206 K(committed),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 (unsigned long)VMALLOC_TOTAL >> 10,
208 vmi.used >> 10,
209 vmi.largest_chunk >> 10
210 );
211
212 len += hugetlb_report_meminfo(page + len);
213
214 return proc_calc_metrics(page, start, off, count, eof, len);
215#undef K
216}
217
218extern struct seq_operations fragmentation_op;
219static int fragmentation_open(struct inode *inode, struct file *file)
220{
221 (void)inode;
222 return seq_open(file, &fragmentation_op);
223}
224
Arjan van de Ven00977a52007-02-12 00:55:34 -0800225static const struct file_operations fragmentation_file_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 .open = fragmentation_open,
227 .read = seq_read,
228 .llseek = seq_lseek,
229 .release = seq_release,
230};
231
Nikita Danilov295ab932005-06-21 17:14:38 -0700232extern struct seq_operations zoneinfo_op;
233static int zoneinfo_open(struct inode *inode, struct file *file)
234{
235 return seq_open(file, &zoneinfo_op);
236}
237
Arjan van de Ven00977a52007-02-12 00:55:34 -0800238static const struct file_operations proc_zoneinfo_file_operations = {
Nikita Danilov295ab932005-06-21 17:14:38 -0700239 .open = zoneinfo_open,
240 .read = seq_read,
241 .llseek = seq_lseek,
242 .release = seq_release,
243};
244
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245static int version_read_proc(char *page, char **start, off_t off,
246 int count, int *eof, void *data)
247{
248 int len;
249
Roman Zippel3eb3c742007-01-10 14:45:28 +0100250 len = snprintf(page, PAGE_SIZE, linux_proc_banner,
Linus Torvalds89937802006-12-11 09:28:46 -0800251 utsname()->sysname,
252 utsname()->release,
253 utsname()->version);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 return proc_calc_metrics(page, start, off, count, eof, len);
255}
256
257extern struct seq_operations cpuinfo_op;
258static int cpuinfo_open(struct inode *inode, struct file *file)
259{
260 return seq_open(file, &cpuinfo_op);
261}
Neil Horman7170be52006-01-14 13:20:38 -0800262
Arjan van de Ven00977a52007-02-12 00:55:34 -0800263static const struct file_operations proc_cpuinfo_operations = {
Joe Korty68eef3b2006-03-31 02:30:32 -0800264 .open = cpuinfo_open,
Neil Horman7170be52006-01-14 13:20:38 -0800265 .read = seq_read,
266 .llseek = seq_lseek,
267 .release = seq_release,
268};
269
Joe Korty68eef3b2006-03-31 02:30:32 -0800270static int devinfo_show(struct seq_file *f, void *v)
271{
272 int i = *(loff_t *) v;
273
274 if (i < CHRDEV_MAJOR_HASH_SIZE) {
275 if (i == 0)
276 seq_printf(f, "Character devices:\n");
277 chrdev_show(f, i);
David Howells93614012006-09-30 20:45:40 +0200278 }
279#ifdef CONFIG_BLOCK
280 else {
Joe Korty68eef3b2006-03-31 02:30:32 -0800281 i -= CHRDEV_MAJOR_HASH_SIZE;
282 if (i == 0)
283 seq_printf(f, "\nBlock devices:\n");
284 blkdev_show(f, i);
285 }
David Howells93614012006-09-30 20:45:40 +0200286#endif
Joe Korty68eef3b2006-03-31 02:30:32 -0800287 return 0;
288}
289
290static void *devinfo_start(struct seq_file *f, loff_t *pos)
291{
292 if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
293 return pos;
294 return NULL;
295}
296
297static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
298{
299 (*pos)++;
300 if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
301 return NULL;
302 return pos;
303}
304
305static void devinfo_stop(struct seq_file *f, void *v)
306{
307 /* Nothing to do */
308}
309
310static struct seq_operations devinfo_ops = {
311 .start = devinfo_start,
312 .next = devinfo_next,
313 .stop = devinfo_stop,
314 .show = devinfo_show
315};
316
317static int devinfo_open(struct inode *inode, struct file *filp)
318{
319 return seq_open(filp, &devinfo_ops);
320}
321
Arjan van de Ven00977a52007-02-12 00:55:34 -0800322static const struct file_operations proc_devinfo_operations = {
Joe Korty68eef3b2006-03-31 02:30:32 -0800323 .open = devinfo_open,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 .read = seq_read,
325 .llseek = seq_lseek,
326 .release = seq_release,
327};
328
329extern struct seq_operations vmstat_op;
330static int vmstat_open(struct inode *inode, struct file *file)
331{
332 return seq_open(file, &vmstat_op);
333}
Arjan van de Ven00977a52007-02-12 00:55:34 -0800334static const struct file_operations proc_vmstat_file_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 .open = vmstat_open,
336 .read = seq_read,
337 .llseek = seq_lseek,
338 .release = seq_release,
339};
340
341#ifdef CONFIG_PROC_HARDWARE
342static int hardware_read_proc(char *page, char **start, off_t off,
343 int count, int *eof, void *data)
344{
345 int len = get_hardware_list(page);
346 return proc_calc_metrics(page, start, off, count, eof, len);
347}
348#endif
349
350#ifdef CONFIG_STRAM_PROC
351static int stram_read_proc(char *page, char **start, off_t off,
352 int count, int *eof, void *data)
353{
354 int len = get_stram_list(page);
355 return proc_calc_metrics(page, start, off, count, eof, len);
356}
357#endif
358
David Howells93614012006-09-30 20:45:40 +0200359#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360extern struct seq_operations partitions_op;
361static int partitions_open(struct inode *inode, struct file *file)
362{
363 return seq_open(file, &partitions_op);
364}
Arjan van de Ven00977a52007-02-12 00:55:34 -0800365static const struct file_operations proc_partitions_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 .open = partitions_open,
367 .read = seq_read,
368 .llseek = seq_lseek,
369 .release = seq_release,
370};
371
372extern struct seq_operations diskstats_op;
373static int diskstats_open(struct inode *inode, struct file *file)
374{
375 return seq_open(file, &diskstats_op);
376}
Arjan van de Ven00977a52007-02-12 00:55:34 -0800377static const struct file_operations proc_diskstats_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 .open = diskstats_open,
379 .read = seq_read,
380 .llseek = seq_lseek,
381 .release = seq_release,
382};
David Howells93614012006-09-30 20:45:40 +0200383#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
385#ifdef CONFIG_MODULES
386extern struct seq_operations modules_op;
387static int modules_open(struct inode *inode, struct file *file)
388{
389 return seq_open(file, &modules_op);
390}
Arjan van de Ven00977a52007-02-12 00:55:34 -0800391static const struct file_operations proc_modules_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 .open = modules_open,
393 .read = seq_read,
394 .llseek = seq_lseek,
395 .release = seq_release,
396};
397#endif
398
Matt Mackall10cef602006-01-08 01:01:45 -0800399#ifdef CONFIG_SLAB
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400static int slabinfo_open(struct inode *inode, struct file *file)
401{
402 return seq_open(file, &slabinfo_op);
403}
Arjan van de Ven00977a52007-02-12 00:55:34 -0800404static const struct file_operations proc_slabinfo_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 .open = slabinfo_open,
406 .read = seq_read,
407 .write = slabinfo_write,
408 .llseek = seq_lseek,
409 .release = seq_release,
410};
Al Viro871751e2006-03-25 03:06:39 -0800411
412#ifdef CONFIG_DEBUG_SLAB_LEAK
413extern struct seq_operations slabstats_op;
414static int slabstats_open(struct inode *inode, struct file *file)
415{
416 unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
417 int ret = -ENOMEM;
418 if (n) {
419 ret = seq_open(file, &slabstats_op);
420 if (!ret) {
421 struct seq_file *m = file->private_data;
422 *n = PAGE_SIZE / (2 * sizeof(unsigned long));
423 m->private = n;
424 n = NULL;
425 }
426 kfree(n);
427 }
428 return ret;
429}
430
Arjan van de Ven00977a52007-02-12 00:55:34 -0800431static const struct file_operations proc_slabstats_operations = {
Al Viro871751e2006-03-25 03:06:39 -0800432 .open = slabstats_open,
433 .read = seq_read,
434 .llseek = seq_lseek,
Martin Peschke09f08922007-05-08 00:29:26 -0700435 .release = seq_release_private,
Al Viro871751e2006-03-25 03:06:39 -0800436};
437#endif
Matt Mackall10cef602006-01-08 01:01:45 -0800438#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
440static int show_stat(struct seq_file *p, void *v)
441{
442 int i;
443 unsigned long jif;
444 cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
445 u64 sum = 0;
446
447 user = nice = system = idle = iowait =
448 irq = softirq = steal = cputime64_zero;
449 jif = - wall_to_monotonic.tv_sec;
450 if (wall_to_monotonic.tv_nsec)
451 --jif;
452
KAMEZAWA Hiroyuki0a945022006-03-28 01:56:37 -0800453 for_each_possible_cpu(i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 int j;
455
456 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
457 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
458 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
459 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
460 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
461 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
462 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
463 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
464 for (j = 0 ; j < NR_IRQS ; j++)
465 sum += kstat_cpu(i).irqs[j];
466 }
467
468 seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu\n",
469 (unsigned long long)cputime64_to_clock_t(user),
470 (unsigned long long)cputime64_to_clock_t(nice),
471 (unsigned long long)cputime64_to_clock_t(system),
472 (unsigned long long)cputime64_to_clock_t(idle),
473 (unsigned long long)cputime64_to_clock_t(iowait),
474 (unsigned long long)cputime64_to_clock_t(irq),
475 (unsigned long long)cputime64_to_clock_t(softirq),
476 (unsigned long long)cputime64_to_clock_t(steal));
477 for_each_online_cpu(i) {
478
479 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
480 user = kstat_cpu(i).cpustat.user;
481 nice = kstat_cpu(i).cpustat.nice;
482 system = kstat_cpu(i).cpustat.system;
483 idle = kstat_cpu(i).cpustat.idle;
484 iowait = kstat_cpu(i).cpustat.iowait;
485 irq = kstat_cpu(i).cpustat.irq;
486 softirq = kstat_cpu(i).cpustat.softirq;
487 steal = kstat_cpu(i).cpustat.steal;
488 seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu\n",
489 i,
490 (unsigned long long)cputime64_to_clock_t(user),
491 (unsigned long long)cputime64_to_clock_t(nice),
492 (unsigned long long)cputime64_to_clock_t(system),
493 (unsigned long long)cputime64_to_clock_t(idle),
494 (unsigned long long)cputime64_to_clock_t(iowait),
495 (unsigned long long)cputime64_to_clock_t(irq),
496 (unsigned long long)cputime64_to_clock_t(softirq),
497 (unsigned long long)cputime64_to_clock_t(steal));
498 }
499 seq_printf(p, "intr %llu", (unsigned long long)sum);
500
schwab@suse.dea1854612006-02-03 03:04:24 -0800501#if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA) && !defined(CONFIG_IA64)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 for (i = 0; i < NR_IRQS; i++)
503 seq_printf(p, " %u", kstat_irqs(i));
504#endif
505
506 seq_printf(p,
507 "\nctxt %llu\n"
508 "btime %lu\n"
509 "processes %lu\n"
510 "procs_running %lu\n"
511 "procs_blocked %lu\n",
512 nr_context_switches(),
513 (unsigned long)jif,
514 total_forks,
515 nr_running(),
516 nr_iowait());
517
518 return 0;
519}
520
521static int stat_open(struct inode *inode, struct file *file)
522{
523 unsigned size = 4096 * (1 + num_possible_cpus() / 32);
524 char *buf;
525 struct seq_file *m;
526 int res;
527
528 /* don't ask for more than the kmalloc() max size, currently 128 KB */
529 if (size > 128 * 1024)
530 size = 128 * 1024;
531 buf = kmalloc(size, GFP_KERNEL);
532 if (!buf)
533 return -ENOMEM;
534
535 res = single_open(file, show_stat, NULL);
536 if (!res) {
537 m = file->private_data;
538 m->buf = buf;
539 m->size = size;
540 } else
541 kfree(buf);
542 return res;
543}
Arjan van de Ven00977a52007-02-12 00:55:34 -0800544static const struct file_operations proc_stat_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 .open = stat_open,
546 .read = seq_read,
547 .llseek = seq_lseek,
548 .release = single_release,
549};
550
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551/*
552 * /proc/interrupts
553 */
554static void *int_seq_start(struct seq_file *f, loff_t *pos)
555{
556 return (*pos <= NR_IRQS) ? pos : NULL;
557}
558
559static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
560{
561 (*pos)++;
562 if (*pos > NR_IRQS)
563 return NULL;
564 return pos;
565}
566
567static void int_seq_stop(struct seq_file *f, void *v)
568{
569 /* Nothing to do */
570}
571
572
573extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
574static struct seq_operations int_seq_ops = {
575 .start = int_seq_start,
576 .next = int_seq_next,
577 .stop = int_seq_stop,
578 .show = show_interrupts
579};
580
581static int interrupts_open(struct inode *inode, struct file *filp)
582{
583 return seq_open(filp, &int_seq_ops);
584}
585
Arjan van de Ven00977a52007-02-12 00:55:34 -0800586static const struct file_operations proc_interrupts_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 .open = interrupts_open,
588 .read = seq_read,
589 .llseek = seq_lseek,
590 .release = seq_release,
591};
592
593static int filesystems_read_proc(char *page, char **start, off_t off,
594 int count, int *eof, void *data)
595{
596 int len = get_filesystem_list(page);
597 return proc_calc_metrics(page, start, off, count, eof, len);
598}
599
600static int cmdline_read_proc(char *page, char **start, off_t off,
601 int count, int *eof, void *data)
602{
603 int len;
604
605 len = sprintf(page, "%s\n", saved_command_line);
606 return proc_calc_metrics(page, start, off, count, eof, len);
607}
608
609static int locks_read_proc(char *page, char **start, off_t off,
610 int count, int *eof, void *data)
611{
612 int len = get_locks_status(page, start, off, count);
613
614 if (len < count)
615 *eof = 1;
616 return len;
617}
618
619static int execdomains_read_proc(char *page, char **start, off_t off,
620 int count, int *eof, void *data)
621{
622 int len = get_exec_domain_list(page);
623 return proc_calc_metrics(page, start, off, count, eof, len);
624}
625
626#ifdef CONFIG_MAGIC_SYSRQ
627/*
628 * writing 'C' to /proc/sysrq-trigger is like sysrq-C
629 */
630static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
631 size_t count, loff_t *ppos)
632{
633 if (count) {
634 char c;
635
636 if (get_user(c, buf))
637 return -EFAULT;
David Howells7d12e782006-10-05 14:55:46 +0100638 __handle_sysrq(c, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 }
640 return count;
641}
642
Arjan van de Ven00977a52007-02-12 00:55:34 -0800643static const struct file_operations proc_sysrq_trigger_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 .write = write_sysrq_trigger,
645};
646#endif
647
648struct proc_dir_entry *proc_root_kcore;
649
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800650void create_seq_entry(char *name, mode_t mode, const struct file_operations *f)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651{
652 struct proc_dir_entry *entry;
653 entry = create_proc_entry(name, mode, NULL);
654 if (entry)
655 entry->proc_fops = f;
656}
657
658void __init proc_misc_init(void)
659{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 static struct {
661 char *name;
662 int (*read_proc)(char*,char**,off_t,int,int*,void*);
663 } *p, simple_ones[] = {
664 {"loadavg", loadavg_read_proc},
665 {"uptime", uptime_read_proc},
666 {"meminfo", meminfo_read_proc},
667 {"version", version_read_proc},
668#ifdef CONFIG_PROC_HARDWARE
669 {"hardware", hardware_read_proc},
670#endif
671#ifdef CONFIG_STRAM_PROC
672 {"stram", stram_read_proc},
673#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 {"filesystems", filesystems_read_proc},
675 {"cmdline", cmdline_read_proc},
676 {"locks", locks_read_proc},
677 {"execdomains", execdomains_read_proc},
678 {NULL,}
679 };
680 for (p = simple_ones; p->name; p++)
681 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
682
683 proc_symlink("mounts", NULL, "self/mounts");
684
685 /* And now for trickier ones */
Mike Galbraithc36264d2006-12-06 20:37:42 -0800686#ifdef CONFIG_PRINTK
Andrew Morton100bb932007-02-10 01:45:51 -0800687 {
688 struct proc_dir_entry *entry;
689 entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
690 if (entry)
691 entry->proc_fops = &proc_kmsg_operations;
692 }
Mike Galbraithc36264d2006-12-06 20:37:42 -0800693#endif
Neil Horman7170be52006-01-14 13:20:38 -0800694 create_seq_entry("devices", 0, &proc_devinfo_operations);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
David Howells93614012006-09-30 20:45:40 +0200696#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 create_seq_entry("partitions", 0, &proc_partitions_operations);
David Howells93614012006-09-30 20:45:40 +0200698#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 create_seq_entry("stat", 0, &proc_stat_operations);
700 create_seq_entry("interrupts", 0, &proc_interrupts_operations);
Matt Mackall10cef602006-01-08 01:01:45 -0800701#ifdef CONFIG_SLAB
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
Al Viro871751e2006-03-25 03:06:39 -0800703#ifdef CONFIG_DEBUG_SLAB_LEAK
704 create_seq_entry("slab_allocators", 0 ,&proc_slabstats_operations);
705#endif
Matt Mackall10cef602006-01-08 01:01:45 -0800706#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
708 create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
Nikita Danilov295ab932005-06-21 17:14:38 -0700709 create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
David Howells93614012006-09-30 20:45:40 +0200710#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 create_seq_entry("diskstats", 0, &proc_diskstats_operations);
David Howells93614012006-09-30 20:45:40 +0200712#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713#ifdef CONFIG_MODULES
714 create_seq_entry("modules", 0, &proc_modules_operations);
715#endif
716#ifdef CONFIG_SCHEDSTATS
717 create_seq_entry("schedstat", 0, &proc_schedstat_operations);
718#endif
719#ifdef CONFIG_PROC_KCORE
720 proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
721 if (proc_root_kcore) {
722 proc_root_kcore->proc_fops = &proc_kcore_operations;
723 proc_root_kcore->size =
724 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
725 }
726#endif
Vivek Goyal666bfdd2005-06-25 14:58:21 -0700727#ifdef CONFIG_PROC_VMCORE
728 proc_vmcore = create_proc_entry("vmcore", S_IRUSR, NULL);
729 if (proc_vmcore)
730 proc_vmcore->proc_fops = &proc_vmcore_operations;
731#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732#ifdef CONFIG_MAGIC_SYSRQ
Andrew Morton100bb932007-02-10 01:45:51 -0800733 {
734 struct proc_dir_entry *entry;
735 entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
736 if (entry)
737 entry->proc_fops = &proc_sysrq_trigger_operations;
738 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740}