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 <linux/bootmem.h>
50 #include <asm/uaccess.h>
51 #include <asm/pgtable.h>
54 #include <asm/div64.h>
57 #define LOAD_INT(x) ((x) >> FSHIFT)
58 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
60 * Warning: stuff below (imported functions) assumes that its output will fit
61 * into one page. For some of those functions it may be wrong. Moreover, we
62 * have a way to deal with that gracefully. Right now I used straightforward
63 * wrappers, but this needs further analysis wrt potential overflows.
65 extern int get_hardware_list(char *);
66 extern int get_stram_list(char *);
67 extern int get_filesystem_list(char *);
68 extern int get_exec_domain_list(char *);
69 extern int get_dma_list(char *);
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,
96 task_active_pid_ns(current)->last_pid);
97 return proc_calc_metrics(page, start, off, count, eof, len);
100 static int uptime_read_proc(char *page, char **start, off_t off,
101 int count, int *eof, void *data)
103 struct timespec uptime;
104 struct timespec idle;
106 cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
108 do_posix_clock_monotonic_gettime(&uptime);
109 monotonic_to_bootbased(&uptime);
110 cputime_to_timespec(idletime, &idle);
111 len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
112 (unsigned long) uptime.tv_sec,
113 (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
114 (unsigned long) idle.tv_sec,
115 (idle.tv_nsec / (NSEC_PER_SEC / 100)));
117 return proc_calc_metrics(page, start, off, count, eof, len);
120 static int meminfo_read_proc(char *page, char **start, off_t off,
121 int count, int *eof, void *data)
125 unsigned long committed;
126 unsigned long allowed;
127 struct vmalloc_info vmi;
131 * display in kilobytes.
133 #define K(x) ((x) << (PAGE_SHIFT - 10))
136 committed = atomic_read(&vm_committed_space);
137 allowed = ((totalram_pages - hugetlb_total_pages())
138 * sysctl_overcommit_ratio / 100) + total_swap_pages;
140 cached = global_page_state(NR_FILE_PAGES) -
141 total_swapcache_pages - i.bufferram;
145 get_vmalloc_info(&vmi);
148 * Tagged format, for easy grepping and expansion.
151 "MemTotal: %8lu kB\n"
155 "SwapCached: %8lu kB\n"
157 "Inactive: %8lu kB\n"
158 #ifdef CONFIG_HIGHMEM
159 "HighTotal: %8lu kB\n"
160 "HighFree: %8lu kB\n"
161 "LowTotal: %8lu kB\n"
164 "SwapTotal: %8lu kB\n"
165 "SwapFree: %8lu kB\n"
167 "Writeback: %8lu kB\n"
168 "AnonPages: %8lu kB\n"
171 "SReclaimable: %8lu kB\n"
172 "SUnreclaim: %8lu kB\n"
173 "PageTables: %8lu kB\n"
174 "NFS_Unstable: %8lu kB\n"
176 "CommitLimit: %8lu kB\n"
177 "Committed_AS: %8lu kB\n"
178 "VmallocTotal: %8lu kB\n"
179 "VmallocUsed: %8lu kB\n"
180 "VmallocChunk: %8lu kB\n",
185 K(total_swapcache_pages),
186 K(global_page_state(NR_ACTIVE)),
187 K(global_page_state(NR_INACTIVE)),
188 #ifdef CONFIG_HIGHMEM
191 K(i.totalram-i.totalhigh),
192 K(i.freeram-i.freehigh),
196 K(global_page_state(NR_FILE_DIRTY)),
197 K(global_page_state(NR_WRITEBACK)),
198 K(global_page_state(NR_ANON_PAGES)),
199 K(global_page_state(NR_FILE_MAPPED)),
200 K(global_page_state(NR_SLAB_RECLAIMABLE) +
201 global_page_state(NR_SLAB_UNRECLAIMABLE)),
202 K(global_page_state(NR_SLAB_RECLAIMABLE)),
203 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
204 K(global_page_state(NR_PAGETABLE)),
205 K(global_page_state(NR_UNSTABLE_NFS)),
206 K(global_page_state(NR_BOUNCE)),
209 (unsigned long)VMALLOC_TOTAL >> 10,
211 vmi.largest_chunk >> 10
214 len += hugetlb_report_meminfo(page + len);
216 return proc_calc_metrics(page, start, off, count, eof, len);
220 extern struct seq_operations fragmentation_op;
221 static int fragmentation_open(struct inode *inode, struct file *file)
224 return seq_open(file, &fragmentation_op);
227 static const struct file_operations fragmentation_file_operations = {
228 .open = fragmentation_open,
231 .release = seq_release,
234 extern struct seq_operations pagetypeinfo_op;
235 static int pagetypeinfo_open(struct inode *inode, struct file *file)
237 return seq_open(file, &pagetypeinfo_op);
240 static const struct file_operations pagetypeinfo_file_ops = {
241 .open = pagetypeinfo_open,
244 .release = seq_release,
247 extern struct seq_operations zoneinfo_op;
248 static int zoneinfo_open(struct inode *inode, struct file *file)
250 return seq_open(file, &zoneinfo_op);
253 static const struct file_operations proc_zoneinfo_file_operations = {
254 .open = zoneinfo_open,
257 .release = seq_release,
260 static int version_read_proc(char *page, char **start, off_t off,
261 int count, int *eof, void *data)
265 len = snprintf(page, PAGE_SIZE, linux_proc_banner,
269 return proc_calc_metrics(page, start, off, count, eof, len);
272 extern struct seq_operations cpuinfo_op;
273 static int cpuinfo_open(struct inode *inode, struct file *file)
275 return seq_open(file, &cpuinfo_op);
278 static const struct file_operations proc_cpuinfo_operations = {
279 .open = cpuinfo_open,
282 .release = seq_release,
285 static int devinfo_show(struct seq_file *f, void *v)
287 int i = *(loff_t *) v;
289 if (i < CHRDEV_MAJOR_HASH_SIZE) {
291 seq_printf(f, "Character devices:\n");
296 i -= CHRDEV_MAJOR_HASH_SIZE;
298 seq_printf(f, "\nBlock devices:\n");
305 static void *devinfo_start(struct seq_file *f, loff_t *pos)
307 if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
312 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
315 if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
320 static void devinfo_stop(struct seq_file *f, void *v)
325 static struct seq_operations devinfo_ops = {
326 .start = devinfo_start,
327 .next = devinfo_next,
328 .stop = devinfo_stop,
332 static int devinfo_open(struct inode *inode, struct file *filp)
334 return seq_open(filp, &devinfo_ops);
337 static const struct file_operations proc_devinfo_operations = {
338 .open = devinfo_open,
341 .release = seq_release,
344 extern struct seq_operations vmstat_op;
345 static int vmstat_open(struct inode *inode, struct file *file)
347 return seq_open(file, &vmstat_op);
349 static const struct file_operations proc_vmstat_file_operations = {
353 .release = seq_release,
356 #ifdef CONFIG_PROC_HARDWARE
357 static int hardware_read_proc(char *page, char **start, off_t off,
358 int count, int *eof, void *data)
360 int len = get_hardware_list(page);
361 return proc_calc_metrics(page, start, off, count, eof, len);
365 #ifdef CONFIG_STRAM_PROC
366 static int stram_read_proc(char *page, char **start, off_t off,
367 int count, int *eof, void *data)
369 int len = get_stram_list(page);
370 return proc_calc_metrics(page, start, off, count, eof, len);
375 extern struct seq_operations partitions_op;
376 static int partitions_open(struct inode *inode, struct file *file)
378 return seq_open(file, &partitions_op);
380 static const struct file_operations proc_partitions_operations = {
381 .open = partitions_open,
384 .release = seq_release,
387 extern struct seq_operations diskstats_op;
388 static int diskstats_open(struct inode *inode, struct file *file)
390 return seq_open(file, &diskstats_op);
392 static const struct file_operations proc_diskstats_operations = {
393 .open = diskstats_open,
396 .release = seq_release,
400 #ifdef CONFIG_MODULES
401 extern struct seq_operations modules_op;
402 static int modules_open(struct inode *inode, struct file *file)
404 return seq_open(file, &modules_op);
406 static const struct file_operations proc_modules_operations = {
407 .open = modules_open,
410 .release = seq_release,
414 #ifdef CONFIG_SLABINFO
415 static int slabinfo_open(struct inode *inode, struct file *file)
417 return seq_open(file, &slabinfo_op);
419 static const struct file_operations proc_slabinfo_operations = {
420 .open = slabinfo_open,
422 .write = slabinfo_write,
424 .release = seq_release,
427 #ifdef CONFIG_DEBUG_SLAB_LEAK
428 extern struct seq_operations slabstats_op;
429 static int slabstats_open(struct inode *inode, struct file *file)
431 unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
434 ret = seq_open(file, &slabstats_op);
436 struct seq_file *m = file->private_data;
437 *n = PAGE_SIZE / (2 * sizeof(unsigned long));
446 static const struct file_operations proc_slabstats_operations = {
447 .open = slabstats_open,
450 .release = seq_release_private,
455 static int show_stat(struct seq_file *p, void *v)
459 cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
462 struct timespec boottime;
463 unsigned int *per_irq_sum;
465 per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
469 user = nice = system = idle = iowait =
470 irq = softirq = steal = cputime64_zero;
471 guest = cputime64_zero;
472 getboottime(&boottime);
473 jif = boottime.tv_sec;
475 for_each_possible_cpu(i) {
478 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
479 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
480 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
481 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
482 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
483 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
484 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
485 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
486 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
487 for (j = 0; j < NR_IRQS; j++) {
488 unsigned int temp = kstat_cpu(i).irqs[j];
490 per_irq_sum[j] += temp;
494 seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
495 (unsigned long long)cputime64_to_clock_t(user),
496 (unsigned long long)cputime64_to_clock_t(nice),
497 (unsigned long long)cputime64_to_clock_t(system),
498 (unsigned long long)cputime64_to_clock_t(idle),
499 (unsigned long long)cputime64_to_clock_t(iowait),
500 (unsigned long long)cputime64_to_clock_t(irq),
501 (unsigned long long)cputime64_to_clock_t(softirq),
502 (unsigned long long)cputime64_to_clock_t(steal),
503 (unsigned long long)cputime64_to_clock_t(guest));
504 for_each_online_cpu(i) {
506 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
507 user = kstat_cpu(i).cpustat.user;
508 nice = kstat_cpu(i).cpustat.nice;
509 system = kstat_cpu(i).cpustat.system;
510 idle = kstat_cpu(i).cpustat.idle;
511 iowait = kstat_cpu(i).cpustat.iowait;
512 irq = kstat_cpu(i).cpustat.irq;
513 softirq = kstat_cpu(i).cpustat.softirq;
514 steal = kstat_cpu(i).cpustat.steal;
515 guest = kstat_cpu(i).cpustat.guest;
517 "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
519 (unsigned long long)cputime64_to_clock_t(user),
520 (unsigned long long)cputime64_to_clock_t(nice),
521 (unsigned long long)cputime64_to_clock_t(system),
522 (unsigned long long)cputime64_to_clock_t(idle),
523 (unsigned long long)cputime64_to_clock_t(iowait),
524 (unsigned long long)cputime64_to_clock_t(irq),
525 (unsigned long long)cputime64_to_clock_t(softirq),
526 (unsigned long long)cputime64_to_clock_t(steal),
527 (unsigned long long)cputime64_to_clock_t(guest));
529 seq_printf(p, "intr %llu", (unsigned long long)sum);
531 for (i = 0; i < NR_IRQS; i++)
532 seq_printf(p, " %u", per_irq_sum[i]);
538 "procs_running %lu\n"
539 "procs_blocked %lu\n",
540 nr_context_switches(),
550 static int stat_open(struct inode *inode, struct file *file)
552 unsigned size = 4096 * (1 + num_possible_cpus() / 32);
557 /* don't ask for more than the kmalloc() max size, currently 128 KB */
558 if (size > 128 * 1024)
560 buf = kmalloc(size, GFP_KERNEL);
564 res = single_open(file, show_stat, NULL);
566 m = file->private_data;
573 static const struct file_operations proc_stat_operations = {
577 .release = single_release,
583 static void *int_seq_start(struct seq_file *f, loff_t *pos)
585 return (*pos <= NR_IRQS) ? pos : NULL;
588 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
596 static void int_seq_stop(struct seq_file *f, void *v)
602 extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
603 static struct seq_operations int_seq_ops = {
604 .start = int_seq_start,
605 .next = int_seq_next,
606 .stop = int_seq_stop,
607 .show = show_interrupts
610 static int interrupts_open(struct inode *inode, struct file *filp)
612 return seq_open(filp, &int_seq_ops);
615 static const struct file_operations proc_interrupts_operations = {
616 .open = interrupts_open,
619 .release = seq_release,
622 static int filesystems_read_proc(char *page, char **start, off_t off,
623 int count, int *eof, void *data)
625 int len = get_filesystem_list(page);
626 return proc_calc_metrics(page, start, off, count, eof, len);
629 static int cmdline_read_proc(char *page, char **start, off_t off,
630 int count, int *eof, void *data)
634 len = sprintf(page, "%s\n", saved_command_line);
635 return proc_calc_metrics(page, start, off, count, eof, len);
638 static int locks_open(struct inode *inode, struct file *filp)
640 return seq_open(filp, &locks_seq_operations);
643 static const struct file_operations proc_locks_operations = {
647 .release = seq_release,
650 static int execdomains_read_proc(char *page, char **start, off_t off,
651 int count, int *eof, void *data)
653 int len = get_exec_domain_list(page);
654 return proc_calc_metrics(page, start, off, count, eof, len);
657 #ifdef CONFIG_MAGIC_SYSRQ
659 * writing 'C' to /proc/sysrq-trigger is like sysrq-C
661 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
662 size_t count, loff_t *ppos)
667 if (get_user(c, buf))
669 __handle_sysrq(c, NULL, 0);
674 static const struct file_operations proc_sysrq_trigger_operations = {
675 .write = write_sysrq_trigger,
679 #define KPMSIZE sizeof(u64)
680 #define KPMMASK (KPMSIZE - 1)
681 /* /proc/kpagecount - an array exposing page counts
683 * Each entry is a u64 representing the corresponding
684 * physical page count.
686 static ssize_t kpagecount_read(struct file *file, char __user *buf,
687 size_t count, loff_t *ppos)
689 u64 __user *out = (u64 __user *)buf;
691 unsigned long src = *ppos;
697 count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
698 if (src & KPMMASK || count & KPMMASK)
702 ppage = pfn_to_page(pfn++);
706 pcount = atomic_read(&ppage->_count);
708 if (put_user(pcount, out++)) {
716 *ppos += (char __user *)out - buf;
718 ret = (char __user *)out - buf;
722 static struct file_operations proc_kpagecount_operations = {
724 .read = kpagecount_read,
727 struct proc_dir_entry *proc_root_kcore;
729 void create_seq_entry(char *name, mode_t mode, const struct file_operations *f)
731 struct proc_dir_entry *entry;
732 entry = create_proc_entry(name, mode, NULL);
734 entry->proc_fops = f;
737 void __init proc_misc_init(void)
741 int (*read_proc)(char*,char**,off_t,int,int*,void*);
742 } *p, simple_ones[] = {
743 {"loadavg", loadavg_read_proc},
744 {"uptime", uptime_read_proc},
745 {"meminfo", meminfo_read_proc},
746 {"version", version_read_proc},
747 #ifdef CONFIG_PROC_HARDWARE
748 {"hardware", hardware_read_proc},
750 #ifdef CONFIG_STRAM_PROC
751 {"stram", stram_read_proc},
753 {"filesystems", filesystems_read_proc},
754 {"cmdline", cmdline_read_proc},
755 {"execdomains", execdomains_read_proc},
758 for (p = simple_ones; p->name; p++)
759 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
761 proc_symlink("mounts", NULL, "self/mounts");
763 /* And now for trickier ones */
766 struct proc_dir_entry *entry;
767 entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
769 entry->proc_fops = &proc_kmsg_operations;
772 create_seq_entry("locks", 0, &proc_locks_operations);
773 create_seq_entry("devices", 0, &proc_devinfo_operations);
774 create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
776 create_seq_entry("partitions", 0, &proc_partitions_operations);
778 create_seq_entry("stat", 0, &proc_stat_operations);
779 create_seq_entry("interrupts", 0, &proc_interrupts_operations);
780 #ifdef CONFIG_SLABINFO
781 create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
782 #ifdef CONFIG_DEBUG_SLAB_LEAK
783 create_seq_entry("slab_allocators", 0 ,&proc_slabstats_operations);
786 create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
787 create_seq_entry("pagetypeinfo", S_IRUGO, &pagetypeinfo_file_ops);
788 create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
789 create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
791 create_seq_entry("diskstats", 0, &proc_diskstats_operations);
793 #ifdef CONFIG_MODULES
794 create_seq_entry("modules", 0, &proc_modules_operations);
796 #ifdef CONFIG_SCHEDSTATS
797 create_seq_entry("schedstat", 0, &proc_schedstat_operations);
799 #ifdef CONFIG_PROC_KCORE
800 proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
801 if (proc_root_kcore) {
802 proc_root_kcore->proc_fops = &proc_kcore_operations;
803 proc_root_kcore->size =
804 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
807 create_seq_entry("kpagecount", S_IRUSR, &proc_kpagecount_operations);
808 #ifdef CONFIG_PROC_VMCORE
809 proc_vmcore = create_proc_entry("vmcore", S_IRUSR, NULL);
811 proc_vmcore->proc_fops = &proc_vmcore_operations;
813 #ifdef CONFIG_MAGIC_SYSRQ
815 struct proc_dir_entry *entry;
816 entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
818 entry->proc_fops = &proc_sysrq_trigger_operations;