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 *);
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
, current
->nsproxy
->pid_ns
->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 unsigned long committed
;
124 unsigned long allowed
;
125 struct vmalloc_info vmi
;
129 * display in kilobytes.
131 #define K(x) ((x) << (PAGE_SHIFT - 10))
134 committed
= atomic_read(&vm_committed_space
);
135 allowed
= ((totalram_pages
- hugetlb_total_pages())
136 * sysctl_overcommit_ratio
/ 100) + total_swap_pages
;
138 cached
= global_page_state(NR_FILE_PAGES
) -
139 total_swapcache_pages
- i
.bufferram
;
143 get_vmalloc_info(&vmi
);
146 * Tagged format, for easy grepping and expansion.
149 "MemTotal: %8lu kB\n"
153 "SwapCached: %8lu kB\n"
155 "Inactive: %8lu kB\n"
156 #ifdef CONFIG_HIGHMEM
157 "HighTotal: %8lu kB\n"
158 "HighFree: %8lu kB\n"
159 "LowTotal: %8lu kB\n"
162 "SwapTotal: %8lu kB\n"
163 "SwapFree: %8lu kB\n"
165 "Writeback: %8lu kB\n"
166 "AnonPages: %8lu kB\n"
169 "SReclaimable: %8lu kB\n"
170 "SUnreclaim: %8lu kB\n"
171 "PageTables: %8lu kB\n"
172 "NFS_Unstable: %8lu kB\n"
174 "CommitLimit: %8lu kB\n"
175 "Committed_AS: %8lu kB\n"
176 "VmallocTotal: %8lu kB\n"
177 "VmallocUsed: %8lu kB\n"
178 "VmallocChunk: %8lu kB\n",
183 K(total_swapcache_pages
),
184 K(global_page_state(NR_ACTIVE
)),
185 K(global_page_state(NR_INACTIVE
)),
186 #ifdef CONFIG_HIGHMEM
189 K(i
.totalram
-i
.totalhigh
),
190 K(i
.freeram
-i
.freehigh
),
194 K(global_page_state(NR_FILE_DIRTY
)),
195 K(global_page_state(NR_WRITEBACK
)),
196 K(global_page_state(NR_ANON_PAGES
)),
197 K(global_page_state(NR_FILE_MAPPED
)),
198 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
)),
202 K(global_page_state(NR_PAGETABLE
)),
203 K(global_page_state(NR_UNSTABLE_NFS
)),
204 K(global_page_state(NR_BOUNCE
)),
207 (unsigned long)VMALLOC_TOTAL
>> 10,
209 vmi
.largest_chunk
>> 10
212 len
+= hugetlb_report_meminfo(page
+ len
);
214 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
218 extern struct seq_operations fragmentation_op
;
219 static int fragmentation_open(struct inode
*inode
, struct file
*file
)
222 return seq_open(file
, &fragmentation_op
);
225 static const struct file_operations fragmentation_file_operations
= {
226 .open
= fragmentation_open
,
229 .release
= seq_release
,
232 extern struct seq_operations zoneinfo_op
;
233 static int zoneinfo_open(struct inode
*inode
, struct file
*file
)
235 return seq_open(file
, &zoneinfo_op
);
238 static const struct file_operations proc_zoneinfo_file_operations
= {
239 .open
= zoneinfo_open
,
242 .release
= seq_release
,
245 static int version_read_proc(char *page
, char **start
, off_t off
,
246 int count
, int *eof
, void *data
)
250 len
= snprintf(page
, PAGE_SIZE
, linux_proc_banner
,
254 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
257 extern struct seq_operations cpuinfo_op
;
258 static int cpuinfo_open(struct inode
*inode
, struct file
*file
)
260 return seq_open(file
, &cpuinfo_op
);
263 static const struct file_operations proc_cpuinfo_operations
= {
264 .open
= cpuinfo_open
,
267 .release
= seq_release
,
270 static int devinfo_show(struct seq_file
*f
, void *v
)
272 int i
= *(loff_t
*) v
;
274 if (i
< CHRDEV_MAJOR_HASH_SIZE
) {
276 seq_printf(f
, "Character devices:\n");
281 i
-= CHRDEV_MAJOR_HASH_SIZE
;
283 seq_printf(f
, "\nBlock devices:\n");
290 static void *devinfo_start(struct seq_file
*f
, loff_t
*pos
)
292 if (*pos
< (BLKDEV_MAJOR_HASH_SIZE
+ CHRDEV_MAJOR_HASH_SIZE
))
297 static void *devinfo_next(struct seq_file
*f
, void *v
, loff_t
*pos
)
300 if (*pos
>= (BLKDEV_MAJOR_HASH_SIZE
+ CHRDEV_MAJOR_HASH_SIZE
))
305 static void devinfo_stop(struct seq_file
*f
, void *v
)
310 static struct seq_operations devinfo_ops
= {
311 .start
= devinfo_start
,
312 .next
= devinfo_next
,
313 .stop
= devinfo_stop
,
317 static int devinfo_open(struct inode
*inode
, struct file
*filp
)
319 return seq_open(filp
, &devinfo_ops
);
322 static const struct file_operations proc_devinfo_operations
= {
323 .open
= devinfo_open
,
326 .release
= seq_release
,
329 extern struct seq_operations vmstat_op
;
330 static int vmstat_open(struct inode
*inode
, struct file
*file
)
332 return seq_open(file
, &vmstat_op
);
334 static const struct file_operations proc_vmstat_file_operations
= {
338 .release
= seq_release
,
341 #ifdef CONFIG_PROC_HARDWARE
342 static int hardware_read_proc(char *page
, char **start
, off_t off
,
343 int count
, int *eof
, void *data
)
345 int len
= get_hardware_list(page
);
346 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
350 #ifdef CONFIG_STRAM_PROC
351 static int stram_read_proc(char *page
, char **start
, off_t off
,
352 int count
, int *eof
, void *data
)
354 int len
= get_stram_list(page
);
355 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
360 extern struct seq_operations partitions_op
;
361 static int partitions_open(struct inode
*inode
, struct file
*file
)
363 return seq_open(file
, &partitions_op
);
365 static const struct file_operations proc_partitions_operations
= {
366 .open
= partitions_open
,
369 .release
= seq_release
,
372 extern struct seq_operations diskstats_op
;
373 static int diskstats_open(struct inode
*inode
, struct file
*file
)
375 return seq_open(file
, &diskstats_op
);
377 static const struct file_operations proc_diskstats_operations
= {
378 .open
= diskstats_open
,
381 .release
= seq_release
,
385 #ifdef CONFIG_MODULES
386 extern struct seq_operations modules_op
;
387 static int modules_open(struct inode
*inode
, struct file
*file
)
389 return seq_open(file
, &modules_op
);
391 static const struct file_operations proc_modules_operations
= {
392 .open
= modules_open
,
395 .release
= seq_release
,
400 static int slabinfo_open(struct inode
*inode
, struct file
*file
)
402 return seq_open(file
, &slabinfo_op
);
404 static const struct file_operations proc_slabinfo_operations
= {
405 .open
= slabinfo_open
,
407 .write
= slabinfo_write
,
409 .release
= seq_release
,
412 #ifdef CONFIG_DEBUG_SLAB_LEAK
413 extern struct seq_operations slabstats_op
;
414 static int slabstats_open(struct inode
*inode
, struct file
*file
)
416 unsigned long *n
= kzalloc(PAGE_SIZE
, GFP_KERNEL
);
419 ret
= seq_open(file
, &slabstats_op
);
421 struct seq_file
*m
= file
->private_data
;
422 *n
= PAGE_SIZE
/ (2 * sizeof(unsigned long));
431 static int slabstats_release(struct inode
*inode
, struct file
*file
)
433 struct seq_file
*m
= file
->private_data
;
435 return seq_release(inode
, file
);
438 static const struct file_operations proc_slabstats_operations
= {
439 .open
= slabstats_open
,
442 .release
= slabstats_release
,
447 static int show_stat(struct seq_file
*p
, void *v
)
451 cputime64_t user
, nice
, system
, idle
, iowait
, irq
, softirq
, steal
;
454 user
= nice
= system
= idle
= iowait
=
455 irq
= softirq
= steal
= cputime64_zero
;
456 jif
= - wall_to_monotonic
.tv_sec
;
457 if (wall_to_monotonic
.tv_nsec
)
460 for_each_possible_cpu(i
) {
463 user
= cputime64_add(user
, kstat_cpu(i
).cpustat
.user
);
464 nice
= cputime64_add(nice
, kstat_cpu(i
).cpustat
.nice
);
465 system
= cputime64_add(system
, kstat_cpu(i
).cpustat
.system
);
466 idle
= cputime64_add(idle
, kstat_cpu(i
).cpustat
.idle
);
467 iowait
= cputime64_add(iowait
, kstat_cpu(i
).cpustat
.iowait
);
468 irq
= cputime64_add(irq
, kstat_cpu(i
).cpustat
.irq
);
469 softirq
= cputime64_add(softirq
, kstat_cpu(i
).cpustat
.softirq
);
470 steal
= cputime64_add(steal
, kstat_cpu(i
).cpustat
.steal
);
471 for (j
= 0 ; j
< NR_IRQS
; j
++)
472 sum
+= kstat_cpu(i
).irqs
[j
];
475 seq_printf(p
, "cpu %llu %llu %llu %llu %llu %llu %llu %llu\n",
476 (unsigned long long)cputime64_to_clock_t(user
),
477 (unsigned long long)cputime64_to_clock_t(nice
),
478 (unsigned long long)cputime64_to_clock_t(system
),
479 (unsigned long long)cputime64_to_clock_t(idle
),
480 (unsigned long long)cputime64_to_clock_t(iowait
),
481 (unsigned long long)cputime64_to_clock_t(irq
),
482 (unsigned long long)cputime64_to_clock_t(softirq
),
483 (unsigned long long)cputime64_to_clock_t(steal
));
484 for_each_online_cpu(i
) {
486 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
487 user
= kstat_cpu(i
).cpustat
.user
;
488 nice
= kstat_cpu(i
).cpustat
.nice
;
489 system
= kstat_cpu(i
).cpustat
.system
;
490 idle
= kstat_cpu(i
).cpustat
.idle
;
491 iowait
= kstat_cpu(i
).cpustat
.iowait
;
492 irq
= kstat_cpu(i
).cpustat
.irq
;
493 softirq
= kstat_cpu(i
).cpustat
.softirq
;
494 steal
= kstat_cpu(i
).cpustat
.steal
;
495 seq_printf(p
, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu\n",
497 (unsigned long long)cputime64_to_clock_t(user
),
498 (unsigned long long)cputime64_to_clock_t(nice
),
499 (unsigned long long)cputime64_to_clock_t(system
),
500 (unsigned long long)cputime64_to_clock_t(idle
),
501 (unsigned long long)cputime64_to_clock_t(iowait
),
502 (unsigned long long)cputime64_to_clock_t(irq
),
503 (unsigned long long)cputime64_to_clock_t(softirq
),
504 (unsigned long long)cputime64_to_clock_t(steal
));
506 seq_printf(p
, "intr %llu", (unsigned long long)sum
);
508 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA) && !defined(CONFIG_IA64)
509 for (i
= 0; i
< NR_IRQS
; i
++)
510 seq_printf(p
, " %u", kstat_irqs(i
));
517 "procs_running %lu\n"
518 "procs_blocked %lu\n",
519 nr_context_switches(),
528 static int stat_open(struct inode
*inode
, struct file
*file
)
530 unsigned size
= 4096 * (1 + num_possible_cpus() / 32);
535 /* don't ask for more than the kmalloc() max size, currently 128 KB */
536 if (size
> 128 * 1024)
538 buf
= kmalloc(size
, GFP_KERNEL
);
542 res
= single_open(file
, show_stat
, NULL
);
544 m
= file
->private_data
;
551 static const struct file_operations proc_stat_operations
= {
555 .release
= single_release
,
561 static void *int_seq_start(struct seq_file
*f
, loff_t
*pos
)
563 return (*pos
<= NR_IRQS
) ? pos
: NULL
;
566 static void *int_seq_next(struct seq_file
*f
, void *v
, loff_t
*pos
)
574 static void int_seq_stop(struct seq_file
*f
, void *v
)
580 extern int show_interrupts(struct seq_file
*f
, void *v
); /* In arch code */
581 static struct seq_operations int_seq_ops
= {
582 .start
= int_seq_start
,
583 .next
= int_seq_next
,
584 .stop
= int_seq_stop
,
585 .show
= show_interrupts
588 static int interrupts_open(struct inode
*inode
, struct file
*filp
)
590 return seq_open(filp
, &int_seq_ops
);
593 static const struct file_operations proc_interrupts_operations
= {
594 .open
= interrupts_open
,
597 .release
= seq_release
,
600 static int filesystems_read_proc(char *page
, char **start
, off_t off
,
601 int count
, int *eof
, void *data
)
603 int len
= get_filesystem_list(page
);
604 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
607 static int cmdline_read_proc(char *page
, char **start
, off_t off
,
608 int count
, int *eof
, void *data
)
612 len
= sprintf(page
, "%s\n", saved_command_line
);
613 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
616 static int locks_read_proc(char *page
, char **start
, off_t off
,
617 int count
, int *eof
, void *data
)
619 int len
= get_locks_status(page
, start
, off
, count
);
626 static int execdomains_read_proc(char *page
, char **start
, off_t off
,
627 int count
, int *eof
, void *data
)
629 int len
= get_exec_domain_list(page
);
630 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
633 #ifdef CONFIG_MAGIC_SYSRQ
635 * writing 'C' to /proc/sysrq-trigger is like sysrq-C
637 static ssize_t
write_sysrq_trigger(struct file
*file
, const char __user
*buf
,
638 size_t count
, loff_t
*ppos
)
643 if (get_user(c
, buf
))
645 __handle_sysrq(c
, NULL
, 0);
650 static const struct file_operations proc_sysrq_trigger_operations
= {
651 .write
= write_sysrq_trigger
,
655 struct proc_dir_entry
*proc_root_kcore
;
657 void create_seq_entry(char *name
, mode_t mode
, const struct file_operations
*f
)
659 struct proc_dir_entry
*entry
;
660 entry
= create_proc_entry(name
, mode
, NULL
);
662 entry
->proc_fops
= f
;
665 void __init
proc_misc_init(void)
669 int (*read_proc
)(char*,char**,off_t
,int,int*,void*);
670 } *p
, simple_ones
[] = {
671 {"loadavg", loadavg_read_proc
},
672 {"uptime", uptime_read_proc
},
673 {"meminfo", meminfo_read_proc
},
674 {"version", version_read_proc
},
675 #ifdef CONFIG_PROC_HARDWARE
676 {"hardware", hardware_read_proc
},
678 #ifdef CONFIG_STRAM_PROC
679 {"stram", stram_read_proc
},
681 {"filesystems", filesystems_read_proc
},
682 {"cmdline", cmdline_read_proc
},
683 {"locks", locks_read_proc
},
684 {"execdomains", execdomains_read_proc
},
687 for (p
= simple_ones
; p
->name
; p
++)
688 create_proc_read_entry(p
->name
, 0, NULL
, p
->read_proc
, NULL
);
690 proc_symlink("mounts", NULL
, "self/mounts");
692 /* And now for trickier ones */
695 struct proc_dir_entry
*entry
;
696 entry
= create_proc_entry("kmsg", S_IRUSR
, &proc_root
);
698 entry
->proc_fops
= &proc_kmsg_operations
;
701 create_seq_entry("devices", 0, &proc_devinfo_operations
);
702 create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations
);
704 create_seq_entry("partitions", 0, &proc_partitions_operations
);
706 create_seq_entry("stat", 0, &proc_stat_operations
);
707 create_seq_entry("interrupts", 0, &proc_interrupts_operations
);
709 create_seq_entry("slabinfo",S_IWUSR
|S_IRUGO
,&proc_slabinfo_operations
);
710 #ifdef CONFIG_DEBUG_SLAB_LEAK
711 create_seq_entry("slab_allocators", 0 ,&proc_slabstats_operations
);
714 create_seq_entry("buddyinfo",S_IRUGO
, &fragmentation_file_operations
);
715 create_seq_entry("vmstat",S_IRUGO
, &proc_vmstat_file_operations
);
716 create_seq_entry("zoneinfo",S_IRUGO
, &proc_zoneinfo_file_operations
);
718 create_seq_entry("diskstats", 0, &proc_diskstats_operations
);
720 #ifdef CONFIG_MODULES
721 create_seq_entry("modules", 0, &proc_modules_operations
);
723 #ifdef CONFIG_SCHEDSTATS
724 create_seq_entry("schedstat", 0, &proc_schedstat_operations
);
726 #ifdef CONFIG_PROC_KCORE
727 proc_root_kcore
= create_proc_entry("kcore", S_IRUSR
, NULL
);
728 if (proc_root_kcore
) {
729 proc_root_kcore
->proc_fops
= &proc_kcore_operations
;
730 proc_root_kcore
->size
=
731 (size_t)high_memory
- PAGE_OFFSET
+ PAGE_SIZE
;
734 #ifdef CONFIG_PROC_VMCORE
735 proc_vmcore
= create_proc_entry("vmcore", S_IRUSR
, NULL
);
737 proc_vmcore
->proc_fops
= &proc_vmcore_operations
;
739 #ifdef CONFIG_MAGIC_SYSRQ
741 struct proc_dir_entry
*entry
;
742 entry
= create_proc_entry("sysrq-trigger", S_IWUSR
, NULL
);
744 entry
->proc_fops
= &proc_sysrq_trigger_operations
;