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>
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>
38 #include <linux/seq_file.h>
39 #include <linux/times.h>
40 #include <linux/profile.h>
41 #include <linux/utsname.h>
42 #include <linux/blkdev.h>
43 #include <linux/hugetlb.h>
44 #include <linux/jiffies.h>
45 #include <linux/sysrq.h>
46 #include <linux/vmalloc.h>
47 #include <linux/crash_dump.h>
48 #include <linux/pid_namespace.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 *);
70 static int proc_calc_metrics(char *page, char **start, off_t off,
71 int count, int *eof, int len)
73 if (len <= off+count) *eof = 1;
76 if (len>count) len = count;
81 static int loadavg_read_proc(char *page, char **start, off_t off,
82 int count, int *eof, void *data)
87 a = avenrun[0] + (FIXED_1/200);
88 b = avenrun[1] + (FIXED_1/200);
89 c = avenrun[2] + (FIXED_1/200);
90 len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
91 LOAD_INT(a), LOAD_FRAC(a),
92 LOAD_INT(b), LOAD_FRAC(b),
93 LOAD_INT(c), LOAD_FRAC(c),
94 nr_running(), nr_threads,
95 task_active_pid_ns(current)->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 monotonic_to_bootbased(&uptime);
109 cputime_to_timespec(idletime, &idle);
110 len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
111 (unsigned long) uptime.tv_sec,
112 (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
113 (unsigned long) idle.tv_sec,
114 (idle.tv_nsec / (NSEC_PER_SEC / 100)));
116 return proc_calc_metrics(page, start, off, count, eof, len);
119 static int meminfo_read_proc(char *page, char **start, off_t off,
120 int count, int *eof, void *data)
124 unsigned long committed;
125 unsigned long allowed;
126 struct vmalloc_info vmi;
130 * display in kilobytes.
132 #define K(x) ((x) << (PAGE_SHIFT - 10))
135 committed = atomic_read(&vm_committed_space);
136 allowed = ((totalram_pages - hugetlb_total_pages())
137 * sysctl_overcommit_ratio / 100) + total_swap_pages;
139 cached = global_page_state(NR_FILE_PAGES) -
140 total_swapcache_pages - i.bufferram;
144 get_vmalloc_info(&vmi);
147 * Tagged format, for easy grepping and expansion.
150 "MemTotal: %8lu kB\n"
154 "SwapCached: %8lu kB\n"
156 "Inactive: %8lu kB\n"
157 #ifdef CONFIG_HIGHMEM
158 "HighTotal: %8lu kB\n"
159 "HighFree: %8lu kB\n"
160 "LowTotal: %8lu kB\n"
163 "SwapTotal: %8lu kB\n"
164 "SwapFree: %8lu kB\n"
166 "Writeback: %8lu kB\n"
167 "AnonPages: %8lu kB\n"
170 "SReclaimable: %8lu kB\n"
171 "SUnreclaim: %8lu kB\n"
172 "PageTables: %8lu kB\n"
173 "NFS_Unstable: %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),
185 K(global_page_state(NR_ACTIVE)),
186 K(global_page_state(NR_INACTIVE)),
187 #ifdef CONFIG_HIGHMEM
190 K(i.totalram-i.totalhigh),
191 K(i.freeram-i.freehigh),
195 K(global_page_state(NR_FILE_DIRTY)),
196 K(global_page_state(NR_WRITEBACK)),
197 K(global_page_state(NR_ANON_PAGES)),
198 K(global_page_state(NR_FILE_MAPPED)),
199 K(global_page_state(NR_SLAB_RECLAIMABLE) +
200 global_page_state(NR_SLAB_UNRECLAIMABLE)),
201 K(global_page_state(NR_SLAB_RECLAIMABLE)),
202 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
203 K(global_page_state(NR_PAGETABLE)),
204 K(global_page_state(NR_UNSTABLE_NFS)),
205 K(global_page_state(NR_BOUNCE)),
208 (unsigned long)VMALLOC_TOTAL >> 10,
210 vmi.largest_chunk >> 10
213 len += hugetlb_report_meminfo(page + len);
215 return proc_calc_metrics(page, start, off, count, eof, len);
219 extern struct seq_operations fragmentation_op;
220 static int fragmentation_open(struct inode *inode, struct file *file)
223 return seq_open(file, &fragmentation_op);
226 static const struct file_operations fragmentation_file_operations = {
227 .open = fragmentation_open,
230 .release = seq_release,
233 extern struct seq_operations pagetypeinfo_op;
234 static int pagetypeinfo_open(struct inode *inode, struct file *file)
236 return seq_open(file, &pagetypeinfo_op);
239 static const struct file_operations pagetypeinfo_file_ops = {
240 .open = pagetypeinfo_open,
243 .release = seq_release,
246 extern struct seq_operations zoneinfo_op;
247 static int zoneinfo_open(struct inode *inode, struct file *file)
249 return seq_open(file, &zoneinfo_op);
252 static const struct file_operations proc_zoneinfo_file_operations = {
253 .open = zoneinfo_open,
256 .release = seq_release,
259 static int version_read_proc(char *page, char **start, off_t off,
260 int count, int *eof, void *data)
264 len = snprintf(page, PAGE_SIZE, linux_proc_banner,
268 return proc_calc_metrics(page, start, off, count, eof, len);
271 extern struct seq_operations cpuinfo_op;
272 static int cpuinfo_open(struct inode *inode, struct file *file)
274 return seq_open(file, &cpuinfo_op);
277 static const struct file_operations proc_cpuinfo_operations = {
278 .open = cpuinfo_open,
281 .release = seq_release,
284 static int devinfo_show(struct seq_file *f, void *v)
286 int i = *(loff_t *) v;
288 if (i < CHRDEV_MAJOR_HASH_SIZE) {
290 seq_printf(f, "Character devices:\n");
295 i -= CHRDEV_MAJOR_HASH_SIZE;
297 seq_printf(f, "\nBlock devices:\n");
304 static void *devinfo_start(struct seq_file *f, loff_t *pos)
306 if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
311 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
314 if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
319 static void devinfo_stop(struct seq_file *f, void *v)
324 static struct seq_operations devinfo_ops = {
325 .start = devinfo_start,
326 .next = devinfo_next,
327 .stop = devinfo_stop,
331 static int devinfo_open(struct inode *inode, struct file *filp)
333 return seq_open(filp, &devinfo_ops);
336 static const struct file_operations proc_devinfo_operations = {
337 .open = devinfo_open,
340 .release = seq_release,
343 extern struct seq_operations vmstat_op;
344 static int vmstat_open(struct inode *inode, struct file *file)
346 return seq_open(file, &vmstat_op);
348 static const struct file_operations proc_vmstat_file_operations = {
352 .release = seq_release,
355 #ifdef CONFIG_PROC_HARDWARE
356 static int hardware_read_proc(char *page, char **start, off_t off,
357 int count, int *eof, void *data)
359 int len = get_hardware_list(page);
360 return proc_calc_metrics(page, start, off, count, eof, len);
364 #ifdef CONFIG_STRAM_PROC
365 static int stram_read_proc(char *page, char **start, off_t off,
366 int count, int *eof, void *data)
368 int len = get_stram_list(page);
369 return proc_calc_metrics(page, start, off, count, eof, len);
374 extern struct seq_operations partitions_op;
375 static int partitions_open(struct inode *inode, struct file *file)
377 return seq_open(file, &partitions_op);
379 static const struct file_operations proc_partitions_operations = {
380 .open = partitions_open,
383 .release = seq_release,
386 extern struct seq_operations diskstats_op;
387 static int diskstats_open(struct inode *inode, struct file *file)
389 return seq_open(file, &diskstats_op);
391 static const struct file_operations proc_diskstats_operations = {
392 .open = diskstats_open,
395 .release = seq_release,
399 #ifdef CONFIG_MODULES
400 extern struct seq_operations modules_op;
401 static int modules_open(struct inode *inode, struct file *file)
403 return seq_open(file, &modules_op);
405 static const struct file_operations proc_modules_operations = {
406 .open = modules_open,
409 .release = seq_release,
414 static int slabinfo_open(struct inode *inode, struct file *file)
416 return seq_open(file, &slabinfo_op);
418 static const struct file_operations proc_slabinfo_operations = {
419 .open = slabinfo_open,
421 .write = slabinfo_write,
423 .release = seq_release,
426 #ifdef CONFIG_DEBUG_SLAB_LEAK
427 extern struct seq_operations slabstats_op;
428 static int slabstats_open(struct inode *inode, struct file *file)
430 unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
433 ret = seq_open(file, &slabstats_op);
435 struct seq_file *m = file->private_data;
436 *n = PAGE_SIZE / (2 * sizeof(unsigned long));
445 static const struct file_operations proc_slabstats_operations = {
446 .open = slabstats_open,
449 .release = seq_release_private,
455 static int slabinfo_open(struct inode *inode, struct file *file)
457 return seq_open(file, &slabinfo_op);
460 static const struct file_operations proc_slabinfo_operations = {
461 .open = slabinfo_open,
464 .release = seq_release,
468 static int show_stat(struct seq_file *p, void *v)
472 cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
475 struct timespec boottime;
476 unsigned int *per_irq_sum;
478 per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
482 user = nice = system = idle = iowait =
483 irq = softirq = steal = cputime64_zero;
484 guest = cputime64_zero;
485 getboottime(&boottime);
486 jif = boottime.tv_sec;
488 for_each_possible_cpu(i) {
491 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
492 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
493 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
494 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
495 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
496 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
497 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
498 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
499 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
500 for (j = 0; j < NR_IRQS; j++) {
501 unsigned int temp = kstat_cpu(i).irqs[j];
503 per_irq_sum[j] += temp;
507 seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
508 (unsigned long long)cputime64_to_clock_t(user),
509 (unsigned long long)cputime64_to_clock_t(nice),
510 (unsigned long long)cputime64_to_clock_t(system),
511 (unsigned long long)cputime64_to_clock_t(idle),
512 (unsigned long long)cputime64_to_clock_t(iowait),
513 (unsigned long long)cputime64_to_clock_t(irq),
514 (unsigned long long)cputime64_to_clock_t(softirq),
515 (unsigned long long)cputime64_to_clock_t(steal),
516 (unsigned long long)cputime64_to_clock_t(guest));
517 for_each_online_cpu(i) {
519 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
520 user = kstat_cpu(i).cpustat.user;
521 nice = kstat_cpu(i).cpustat.nice;
522 system = kstat_cpu(i).cpustat.system;
523 idle = kstat_cpu(i).cpustat.idle;
524 iowait = kstat_cpu(i).cpustat.iowait;
525 irq = kstat_cpu(i).cpustat.irq;
526 softirq = kstat_cpu(i).cpustat.softirq;
527 steal = kstat_cpu(i).cpustat.steal;
528 guest = kstat_cpu(i).cpustat.guest;
530 "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
532 (unsigned long long)cputime64_to_clock_t(user),
533 (unsigned long long)cputime64_to_clock_t(nice),
534 (unsigned long long)cputime64_to_clock_t(system),
535 (unsigned long long)cputime64_to_clock_t(idle),
536 (unsigned long long)cputime64_to_clock_t(iowait),
537 (unsigned long long)cputime64_to_clock_t(irq),
538 (unsigned long long)cputime64_to_clock_t(softirq),
539 (unsigned long long)cputime64_to_clock_t(steal),
540 (unsigned long long)cputime64_to_clock_t(guest));
542 seq_printf(p, "intr %llu", (unsigned long long)sum);
544 for (i = 0; i < NR_IRQS; i++)
545 seq_printf(p, " %u", per_irq_sum[i]);
551 "procs_running %lu\n"
552 "procs_blocked %lu\n",
553 nr_context_switches(),
563 static int stat_open(struct inode *inode, struct file *file)
565 unsigned size = 4096 * (1 + num_possible_cpus() / 32);
570 /* don't ask for more than the kmalloc() max size, currently 128 KB */
571 if (size > 128 * 1024)
573 buf = kmalloc(size, GFP_KERNEL);
577 res = single_open(file, show_stat, NULL);
579 m = file->private_data;
586 static const struct file_operations proc_stat_operations = {
590 .release = single_release,
596 static void *int_seq_start(struct seq_file *f, loff_t *pos)
598 return (*pos <= NR_IRQS) ? pos : NULL;
601 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
609 static void int_seq_stop(struct seq_file *f, void *v)
615 extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
616 static struct seq_operations int_seq_ops = {
617 .start = int_seq_start,
618 .next = int_seq_next,
619 .stop = int_seq_stop,
620 .show = show_interrupts
623 static int interrupts_open(struct inode *inode, struct file *filp)
625 return seq_open(filp, &int_seq_ops);
628 static const struct file_operations proc_interrupts_operations = {
629 .open = interrupts_open,
632 .release = seq_release,
635 static int filesystems_read_proc(char *page, char **start, off_t off,
636 int count, int *eof, void *data)
638 int len = get_filesystem_list(page);
639 return proc_calc_metrics(page, start, off, count, eof, len);
642 static int cmdline_read_proc(char *page, char **start, off_t off,
643 int count, int *eof, void *data)
647 len = sprintf(page, "%s\n", saved_command_line);
648 return proc_calc_metrics(page, start, off, count, eof, len);
651 static int locks_open(struct inode *inode, struct file *filp)
653 return seq_open(filp, &locks_seq_operations);
656 static const struct file_operations proc_locks_operations = {
660 .release = seq_release,
663 static int execdomains_read_proc(char *page, char **start, off_t off,
664 int count, int *eof, void *data)
666 int len = get_exec_domain_list(page);
667 return proc_calc_metrics(page, start, off, count, eof, len);
670 #ifdef CONFIG_MAGIC_SYSRQ
672 * writing 'C' to /proc/sysrq-trigger is like sysrq-C
674 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
675 size_t count, loff_t *ppos)
680 if (get_user(c, buf))
682 __handle_sysrq(c, NULL, 0);
687 static const struct file_operations proc_sysrq_trigger_operations = {
688 .write = write_sysrq_trigger,
692 struct proc_dir_entry *proc_root_kcore;
694 void create_seq_entry(char *name, mode_t mode, const struct file_operations *f)
696 struct proc_dir_entry *entry;
697 entry = create_proc_entry(name, mode, NULL);
699 entry->proc_fops = f;
702 void __init proc_misc_init(void)
706 int (*read_proc)(char*,char**,off_t,int,int*,void*);
707 } *p, simple_ones[] = {
708 {"loadavg", loadavg_read_proc},
709 {"uptime", uptime_read_proc},
710 {"meminfo", meminfo_read_proc},
711 {"version", version_read_proc},
712 #ifdef CONFIG_PROC_HARDWARE
713 {"hardware", hardware_read_proc},
715 #ifdef CONFIG_STRAM_PROC
716 {"stram", stram_read_proc},
718 {"filesystems", filesystems_read_proc},
719 {"cmdline", cmdline_read_proc},
720 {"execdomains", execdomains_read_proc},
723 for (p = simple_ones; p->name; p++)
724 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
726 proc_symlink("mounts", NULL, "self/mounts");
728 /* And now for trickier ones */
731 struct proc_dir_entry *entry;
732 entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
734 entry->proc_fops = &proc_kmsg_operations;
737 create_seq_entry("locks", 0, &proc_locks_operations);
738 create_seq_entry("devices", 0, &proc_devinfo_operations);
739 create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
741 create_seq_entry("partitions", 0, &proc_partitions_operations);
743 create_seq_entry("stat", 0, &proc_stat_operations);
744 create_seq_entry("interrupts", 0, &proc_interrupts_operations);
746 create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
747 #ifdef CONFIG_DEBUG_SLAB_LEAK
748 create_seq_entry("slab_allocators", 0 ,&proc_slabstats_operations);
752 create_seq_entry("slabinfo", S_IWUSR|S_IRUGO, &proc_slabinfo_operations);
754 create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
755 create_seq_entry("pagetypeinfo", S_IRUGO, &pagetypeinfo_file_ops);
756 create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
757 create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
759 create_seq_entry("diskstats", 0, &proc_diskstats_operations);
761 #ifdef CONFIG_MODULES
762 create_seq_entry("modules", 0, &proc_modules_operations);
764 #ifdef CONFIG_SCHEDSTATS
765 create_seq_entry("schedstat", 0, &proc_schedstat_operations);
767 #ifdef CONFIG_PROC_KCORE
768 proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
769 if (proc_root_kcore) {
770 proc_root_kcore->proc_fops = &proc_kcore_operations;
771 proc_root_kcore->size =
772 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
775 #ifdef CONFIG_PROC_VMCORE
776 proc_vmcore = create_proc_entry("vmcore", S_IRUSR, NULL);
778 proc_vmcore->proc_fops = &proc_vmcore_operations;
780 #ifdef CONFIG_MAGIC_SYSRQ
782 struct proc_dir_entry *entry;
783 entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
785 entry->proc_fops = &proc_sysrq_trigger_operations;