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
;