2 * linux/fs/proc/proc_misc.c
4 * linux/fs/proc/array.c
5 * Copyright (C) 1992 by Linus Torvalds
6 * based on ideas by Darren Senn
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.
14 * Fulton Green : Encapsulated position metric calculations.
15 * <kernel@FultonGreen.com>
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>
24 #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>
29 #include <linux/config.h>
31 #include <linux/mmzone.h>
32 #include <linux/pagemap.h>
33 #include <linux/swap.h>
34 #include <linux/slab.h>
35 #include <linux/smp.h>
36 #include <linux/signal.h>
37 #include <linux/module.h>
38 #include <linux/init.h>
39 #include <linux/smp_lock.h>
40 #include <linux/seq_file.h>
41 #include <linux/times.h>
42 #include <linux/profile.h>
43 #include <linux/blkdev.h>
44 #include <linux/hugetlb.h>
45 #include <linux/jiffies.h>
46 #include <linux/sysrq.h>
47 #include <linux/vmalloc.h>
48 #include <linux/crash_dump.h>
49 #include <asm/uaccess.h>
50 #include <asm/pgtable.h>
53 #include <asm/div64.h>
56 #define LOAD_INT(x) ((x) >> FSHIFT)
57 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
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.
64 extern int get_hardware_list(char *);
65 extern int get_stram_list(char *);
66 extern int get_filesystem_list(char *);
67 extern int get_exec_domain_list(char *);
68 extern int get_dma_list(char *);
69 extern int get_locks_status (char *, char **, off_t, int);
71 static int proc_calc_metrics(char *page, char **start, off_t off,
72 int count, int *eof, int len)
74 if (len <= off+count) *eof = 1;
77 if (len>count) len = count;
82 static int loadavg_read_proc(char *page, char **start, off_t off,
83 int count, int *eof, void *data)
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),
95 nr_running(), nr_threads, last_pid);
96 return proc_calc_metrics(page, start, off, count, eof, len);
99 static int uptime_read_proc(char *page, char **start, off_t off,
100 int count, int *eof, void *data)
102 struct timespec uptime;
103 struct timespec idle;
105 cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
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)));
115 return proc_calc_metrics(page, start, off, count, eof, len);
118 static int meminfo_read_proc(char *page, char **start, off_t off,
119 int count, int *eof, void *data)
123 struct page_state ps;
124 unsigned long inactive;
125 unsigned long active;
127 unsigned long committed;
128 unsigned long allowed;
129 struct vmalloc_info vmi;
133 get_zone_counts(&active, &inactive, &free);
136 * display in kilobytes.
138 #define K(x) ((x) << (PAGE_SHIFT - 10))
141 committed = atomic_read(&vm_committed_space);
142 allowed = ((totalram_pages - hugetlb_total_pages())
143 * sysctl_overcommit_ratio / 100) + total_swap_pages;
145 cached = global_page_state(NR_FILE_PAGES) -
146 total_swapcache_pages - i.bufferram;
150 get_vmalloc_info(&vmi);
153 * Tagged format, for easy grepping and expansion.
156 "MemTotal: %8lu kB\n"
160 "SwapCached: %8lu kB\n"
162 "Inactive: %8lu kB\n"
163 "HighTotal: %8lu kB\n"
164 "HighFree: %8lu kB\n"
165 "LowTotal: %8lu kB\n"
167 "SwapTotal: %8lu kB\n"
168 "SwapFree: %8lu kB\n"
170 "Writeback: %8lu kB\n"
171 "AnonPages: %8lu kB\n"
174 "PageTables: %8lu kB\n"
175 "CommitLimit: %8lu kB\n"
176 "Committed_AS: %8lu kB\n"
177 "VmallocTotal: %8lu kB\n"
178 "VmallocUsed: %8lu kB\n"
179 "VmallocChunk: %8lu kB\n",
184 K(total_swapcache_pages),
189 K(i.totalram-i.totalhigh),
190 K(i.freeram-i.freehigh),
193 K(global_page_state(NR_FILE_DIRTY)),
195 K(global_page_state(NR_ANON_PAGES)),
196 K(global_page_state(NR_FILE_MAPPED)),
197 K(global_page_state(NR_SLAB)),
198 K(global_page_state(NR_PAGETABLE)),
201 (unsigned long)VMALLOC_TOTAL >> 10,
203 vmi.largest_chunk >> 10
206 len += hugetlb_report_meminfo(page + len);
208 return proc_calc_metrics(page, start, off, count, eof, len);
212 extern struct seq_operations fragmentation_op;
213 static int fragmentation_open(struct inode *inode, struct file *file)
216 return seq_open(file, &fragmentation_op);
219 static struct file_operations fragmentation_file_operations = {
220 .open = fragmentation_open,
223 .release = seq_release,
226 extern struct seq_operations zoneinfo_op;
227 static int zoneinfo_open(struct inode *inode, struct file *file)
229 return seq_open(file, &zoneinfo_op);
232 static struct file_operations proc_zoneinfo_file_operations = {
233 .open = zoneinfo_open,
236 .release = seq_release,
239 static int version_read_proc(char *page, char **start, off_t off,
240 int count, int *eof, void *data)
244 strcpy(page, linux_banner);
246 return proc_calc_metrics(page, start, off, count, eof, len);
249 extern struct seq_operations cpuinfo_op;
250 static int cpuinfo_open(struct inode *inode, struct file *file)
252 return seq_open(file, &cpuinfo_op);
255 static struct file_operations proc_cpuinfo_operations = {
256 .open = cpuinfo_open,
259 .release = seq_release,
262 static int devinfo_show(struct seq_file *f, void *v)
264 int i = *(loff_t *) v;
266 if (i < CHRDEV_MAJOR_HASH_SIZE) {
268 seq_printf(f, "Character devices:\n");
271 i -= CHRDEV_MAJOR_HASH_SIZE;
273 seq_printf(f, "\nBlock devices:\n");
279 static void *devinfo_start(struct seq_file *f, loff_t *pos)
281 if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
286 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
289 if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
294 static void devinfo_stop(struct seq_file *f, void *v)
299 static struct seq_operations devinfo_ops = {
300 .start = devinfo_start,
301 .next = devinfo_next,
302 .stop = devinfo_stop,
306 static int devinfo_open(struct inode *inode, struct file *filp)
308 return seq_open(filp, &devinfo_ops);
311 static struct file_operations proc_devinfo_operations = {
312 .open = devinfo_open,
315 .release = seq_release,
318 extern struct seq_operations vmstat_op;
319 static int vmstat_open(struct inode *inode, struct file *file)
321 return seq_open(file, &vmstat_op);
323 static struct file_operations proc_vmstat_file_operations = {
327 .release = seq_release,
330 #ifdef CONFIG_PROC_HARDWARE
331 static int hardware_read_proc(char *page, char **start, off_t off,
332 int count, int *eof, void *data)
334 int len = get_hardware_list(page);
335 return proc_calc_metrics(page, start, off, count, eof, len);
339 #ifdef CONFIG_STRAM_PROC
340 static int stram_read_proc(char *page, char **start, off_t off,
341 int count, int *eof, void *data)
343 int len = get_stram_list(page);
344 return proc_calc_metrics(page, start, off, count, eof, len);
348 extern struct seq_operations partitions_op;
349 static int partitions_open(struct inode *inode, struct file *file)
351 return seq_open(file, &partitions_op);
353 static struct file_operations proc_partitions_operations = {
354 .open = partitions_open,
357 .release = seq_release,
360 extern struct seq_operations diskstats_op;
361 static int diskstats_open(struct inode *inode, struct file *file)
363 return seq_open(file, &diskstats_op);
365 static struct file_operations proc_diskstats_operations = {
366 .open = diskstats_open,
369 .release = seq_release,
372 #ifdef CONFIG_MODULES
373 extern struct seq_operations modules_op;
374 static int modules_open(struct inode *inode, struct file *file)
376 return seq_open(file, &modules_op);
378 static struct file_operations proc_modules_operations = {
379 .open = modules_open,
382 .release = seq_release,
387 extern struct seq_operations slabinfo_op;
388 extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
389 static int slabinfo_open(struct inode *inode, struct file *file)
391 return seq_open(file, &slabinfo_op);
393 static struct file_operations proc_slabinfo_operations = {
394 .open = slabinfo_open,
396 .write = slabinfo_write,
398 .release = seq_release,
401 #ifdef CONFIG_DEBUG_SLAB_LEAK
402 extern struct seq_operations slabstats_op;
403 static int slabstats_open(struct inode *inode, struct file *file)
405 unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
408 ret = seq_open(file, &slabstats_op);
410 struct seq_file *m = file->private_data;
411 *n = PAGE_SIZE / (2 * sizeof(unsigned long));
420 static int slabstats_release(struct inode *inode, struct file *file)
422 struct seq_file *m = file->private_data;
424 return seq_release(inode, file);
427 static struct file_operations proc_slabstats_operations = {
428 .open = slabstats_open,
431 .release = slabstats_release,
436 static int show_stat(struct seq_file *p, void *v)
440 cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
443 user = nice = system = idle = iowait =
444 irq = softirq = steal = cputime64_zero;
445 jif = - wall_to_monotonic.tv_sec;
446 if (wall_to_monotonic.tv_nsec)
449 for_each_possible_cpu(i) {
452 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
453 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
454 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
455 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
456 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
457 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
458 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
459 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
460 for (j = 0 ; j < NR_IRQS ; j++)
461 sum += kstat_cpu(i).irqs[j];
464 seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu\n",
465 (unsigned long long)cputime64_to_clock_t(user),
466 (unsigned long long)cputime64_to_clock_t(nice),
467 (unsigned long long)cputime64_to_clock_t(system),
468 (unsigned long long)cputime64_to_clock_t(idle),
469 (unsigned long long)cputime64_to_clock_t(iowait),
470 (unsigned long long)cputime64_to_clock_t(irq),
471 (unsigned long long)cputime64_to_clock_t(softirq),
472 (unsigned long long)cputime64_to_clock_t(steal));
473 for_each_online_cpu(i) {
475 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
476 user = kstat_cpu(i).cpustat.user;
477 nice = kstat_cpu(i).cpustat.nice;
478 system = kstat_cpu(i).cpustat.system;
479 idle = kstat_cpu(i).cpustat.idle;
480 iowait = kstat_cpu(i).cpustat.iowait;
481 irq = kstat_cpu(i).cpustat.irq;
482 softirq = kstat_cpu(i).cpustat.softirq;
483 steal = kstat_cpu(i).cpustat.steal;
484 seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu\n",
486 (unsigned long long)cputime64_to_clock_t(user),
487 (unsigned long long)cputime64_to_clock_t(nice),
488 (unsigned long long)cputime64_to_clock_t(system),
489 (unsigned long long)cputime64_to_clock_t(idle),
490 (unsigned long long)cputime64_to_clock_t(iowait),
491 (unsigned long long)cputime64_to_clock_t(irq),
492 (unsigned long long)cputime64_to_clock_t(softirq),
493 (unsigned long long)cputime64_to_clock_t(steal));
495 seq_printf(p, "intr %llu", (unsigned long long)sum);
497 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA) && !defined(CONFIG_IA64)
498 for (i = 0; i < NR_IRQS; i++)
499 seq_printf(p, " %u", kstat_irqs(i));
506 "procs_running %lu\n"
507 "procs_blocked %lu\n",
508 nr_context_switches(),
517 static int stat_open(struct inode *inode, struct file *file)
519 unsigned size = 4096 * (1 + num_possible_cpus() / 32);
524 /* don't ask for more than the kmalloc() max size, currently 128 KB */
525 if (size > 128 * 1024)
527 buf = kmalloc(size, GFP_KERNEL);
531 res = single_open(file, show_stat, NULL);
533 m = file->private_data;
540 static struct file_operations proc_stat_operations = {
544 .release = single_release,
550 static void *int_seq_start(struct seq_file *f, loff_t *pos)
552 return (*pos <= NR_IRQS) ? pos : NULL;
555 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
563 static void int_seq_stop(struct seq_file *f, void *v)
569 extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
570 static struct seq_operations int_seq_ops = {
571 .start = int_seq_start,
572 .next = int_seq_next,
573 .stop = int_seq_stop,
574 .show = show_interrupts
577 static int interrupts_open(struct inode *inode, struct file *filp)
579 return seq_open(filp, &int_seq_ops);
582 static struct file_operations proc_interrupts_operations = {
583 .open = interrupts_open,
586 .release = seq_release,
589 static int filesystems_read_proc(char *page, char **start, off_t off,
590 int count, int *eof, void *data)
592 int len = get_filesystem_list(page);
593 return proc_calc_metrics(page, start, off, count, eof, len);
596 static int cmdline_read_proc(char *page, char **start, off_t off,
597 int count, int *eof, void *data)
601 len = sprintf(page, "%s\n", saved_command_line);
602 return proc_calc_metrics(page, start, off, count, eof, len);
605 static int locks_read_proc(char *page, char **start, off_t off,
606 int count, int *eof, void *data)
608 int len = get_locks_status(page, start, off, count);
615 static int execdomains_read_proc(char *page, char **start, off_t off,
616 int count, int *eof, void *data)
618 int len = get_exec_domain_list(page);
619 return proc_calc_metrics(page, start, off, count, eof, len);
622 #ifdef CONFIG_MAGIC_SYSRQ
624 * writing 'C' to /proc/sysrq-trigger is like sysrq-C
626 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
627 size_t count, loff_t *ppos)
632 if (get_user(c, buf))
634 __handle_sysrq(c, NULL, NULL, 0);
639 static struct file_operations proc_sysrq_trigger_operations = {
640 .write = write_sysrq_trigger,
644 struct proc_dir_entry *proc_root_kcore;
646 void create_seq_entry(char *name, mode_t mode, const struct file_operations *f)
648 struct proc_dir_entry *entry;
649 entry = create_proc_entry(name, mode, NULL);
651 entry->proc_fops = f;
654 void __init proc_misc_init(void)
656 struct proc_dir_entry *entry;
659 int (*read_proc)(char*,char**,off_t,int,int*,void*);
660 } *p, simple_ones[] = {
661 {"loadavg", loadavg_read_proc},
662 {"uptime", uptime_read_proc},
663 {"meminfo", meminfo_read_proc},
664 {"version", version_read_proc},
665 #ifdef CONFIG_PROC_HARDWARE
666 {"hardware", hardware_read_proc},
668 #ifdef CONFIG_STRAM_PROC
669 {"stram", stram_read_proc},
671 {"filesystems", filesystems_read_proc},
672 {"cmdline", cmdline_read_proc},
673 {"locks", locks_read_proc},
674 {"execdomains", execdomains_read_proc},
677 for (p = simple_ones; p->name; p++)
678 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
680 proc_symlink("mounts", NULL, "self/mounts");
682 /* And now for trickier ones */
683 entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
685 entry->proc_fops = &proc_kmsg_operations;
686 create_seq_entry("devices", 0, &proc_devinfo_operations);
687 create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
688 create_seq_entry("partitions", 0, &proc_partitions_operations);
689 create_seq_entry("stat", 0, &proc_stat_operations);
690 create_seq_entry("interrupts", 0, &proc_interrupts_operations);
692 create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
693 #ifdef CONFIG_DEBUG_SLAB_LEAK
694 create_seq_entry("slab_allocators", 0 ,&proc_slabstats_operations);
697 create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
698 create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
699 create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
700 create_seq_entry("diskstats", 0, &proc_diskstats_operations);
701 #ifdef CONFIG_MODULES
702 create_seq_entry("modules", 0, &proc_modules_operations);
704 #ifdef CONFIG_SCHEDSTATS
705 create_seq_entry("schedstat", 0, &proc_schedstat_operations);
707 #ifdef CONFIG_PROC_KCORE
708 proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
709 if (proc_root_kcore) {
710 proc_root_kcore->proc_fops = &proc_kcore_operations;
711 proc_root_kcore->size =
712 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
715 #ifdef CONFIG_PROC_VMCORE
716 proc_vmcore = create_proc_entry("vmcore", S_IRUSR, NULL);
718 proc_vmcore->proc_fops = &proc_vmcore_operations;
720 #ifdef CONFIG_MAGIC_SYSRQ
721 entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
723 entry->proc_fops = &proc_sysrq_trigger_operations;