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>
23 #include <linux/tty.h>
24 #include <linux/string.h>
25 #include <linux/mman.h>
26 #include <linux/proc_fs.h>
27 #include <linux/ioport.h>
28 #include <linux/config.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/smp_lock.h>
39 #include <linux/seq_file.h>
40 #include <linux/times.h>
41 #include <linux/profile.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 <asm/uaccess.h>
48 #include <asm/pgtable.h>
51 #include <asm/div64.h>
54 #define LOAD_INT(x) ((x) >> FSHIFT)
55 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
57 * Warning: stuff below (imported functions) assumes that its output will fit
58 * into one page. For some of those functions it may be wrong. Moreover, we
59 * have a way to deal with that gracefully. Right now I used straightforward
60 * wrappers, but this needs further analysis wrt potential overflows.
62 extern int get_hardware_list(char *);
63 extern int get_stram_list(char *);
64 extern int get_chrdev_list(char *);
65 extern int get_filesystem_list(char *);
66 extern int get_exec_domain_list(char *);
67 extern int get_dma_list(char *);
68 extern int get_locks_status (char *, char **, off_t
, int);
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
, last_pid
);
95 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
98 static int uptime_read_proc(char *page
, char **start
, off_t off
,
99 int count
, int *eof
, void *data
)
101 struct timespec uptime
;
102 struct timespec idle
;
104 cputime_t idletime
= cputime_add(init_task
.utime
, init_task
.stime
);
106 do_posix_clock_monotonic_gettime(&uptime
);
107 cputime_to_timespec(idletime
, &idle
);
108 len
= sprintf(page
,"%lu.%02lu %lu.%02lu\n",
109 (unsigned long) uptime
.tv_sec
,
110 (uptime
.tv_nsec
/ (NSEC_PER_SEC
/ 100)),
111 (unsigned long) idle
.tv_sec
,
112 (idle
.tv_nsec
/ (NSEC_PER_SEC
/ 100)));
114 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
117 static int meminfo_read_proc(char *page
, char **start
, off_t off
,
118 int count
, int *eof
, void *data
)
122 struct page_state ps
;
123 unsigned long inactive
;
124 unsigned long active
;
126 unsigned long committed
;
127 unsigned long allowed
;
128 struct vmalloc_info vmi
;
131 get_zone_counts(&active
, &inactive
, &free
);
134 * display in kilobytes.
136 #define K(x) ((x) << (PAGE_SHIFT - 10))
139 committed
= atomic_read(&vm_committed_space
);
140 allowed
= ((totalram_pages
- hugetlb_total_pages())
141 * sysctl_overcommit_ratio
/ 100) + total_swap_pages
;
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 "HighTotal: %8lu kB\n"
157 "HighFree: %8lu kB\n"
158 "LowTotal: %8lu kB\n"
160 "SwapTotal: %8lu kB\n"
161 "SwapFree: %8lu kB\n"
163 "Writeback: %8lu kB\n"
166 "CommitLimit: %8lu kB\n"
167 "Committed_AS: %8lu kB\n"
168 "PageTables: %8lu kB\n"
169 "VmallocTotal: %8lu kB\n"
170 "VmallocUsed: %8lu kB\n"
171 "VmallocChunk: %8lu kB\n",
175 K(get_page_cache_size()-total_swapcache_pages
-i
.bufferram
),
176 K(total_swapcache_pages
),
181 K(i
.totalram
-i
.totalhigh
),
182 K(i
.freeram
-i
.freehigh
),
191 K(ps
.nr_page_table_pages
),
192 (unsigned long)VMALLOC_TOTAL
>> 10,
194 vmi
.largest_chunk
>> 10
197 len
+= hugetlb_report_meminfo(page
+ len
);
199 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
203 extern struct seq_operations fragmentation_op
;
204 static int fragmentation_open(struct inode
*inode
, struct file
*file
)
207 return seq_open(file
, &fragmentation_op
);
210 static struct file_operations fragmentation_file_operations
= {
211 .open
= fragmentation_open
,
214 .release
= seq_release
,
217 static int version_read_proc(char *page
, char **start
, off_t off
,
218 int count
, int *eof
, void *data
)
222 strcpy(page
, linux_banner
);
224 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
227 extern struct seq_operations cpuinfo_op
;
228 static int cpuinfo_open(struct inode
*inode
, struct file
*file
)
230 return seq_open(file
, &cpuinfo_op
);
232 static struct file_operations proc_cpuinfo_operations
= {
233 .open
= cpuinfo_open
,
236 .release
= seq_release
,
239 extern struct seq_operations vmstat_op
;
240 static int vmstat_open(struct inode
*inode
, struct file
*file
)
242 return seq_open(file
, &vmstat_op
);
244 static struct file_operations proc_vmstat_file_operations
= {
248 .release
= seq_release
,
251 #ifdef CONFIG_PROC_HARDWARE
252 static int hardware_read_proc(char *page
, char **start
, off_t off
,
253 int count
, int *eof
, void *data
)
255 int len
= get_hardware_list(page
);
256 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
260 #ifdef CONFIG_STRAM_PROC
261 static int stram_read_proc(char *page
, char **start
, off_t off
,
262 int count
, int *eof
, void *data
)
264 int len
= get_stram_list(page
);
265 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
269 extern struct seq_operations partitions_op
;
270 static int partitions_open(struct inode
*inode
, struct file
*file
)
272 return seq_open(file
, &partitions_op
);
274 static struct file_operations proc_partitions_operations
= {
275 .open
= partitions_open
,
278 .release
= seq_release
,
281 extern struct seq_operations diskstats_op
;
282 static int diskstats_open(struct inode
*inode
, struct file
*file
)
284 return seq_open(file
, &diskstats_op
);
286 static struct file_operations proc_diskstats_operations
= {
287 .open
= diskstats_open
,
290 .release
= seq_release
,
293 #ifdef CONFIG_MODULES
294 extern struct seq_operations modules_op
;
295 static int modules_open(struct inode
*inode
, struct file
*file
)
297 return seq_open(file
, &modules_op
);
299 static struct file_operations proc_modules_operations
= {
300 .open
= modules_open
,
303 .release
= seq_release
,
307 extern struct seq_operations slabinfo_op
;
308 extern ssize_t
slabinfo_write(struct file
*, const char __user
*, size_t, loff_t
*);
309 static int slabinfo_open(struct inode
*inode
, struct file
*file
)
311 return seq_open(file
, &slabinfo_op
);
313 static struct file_operations proc_slabinfo_operations
= {
314 .open
= slabinfo_open
,
316 .write
= slabinfo_write
,
318 .release
= seq_release
,
321 static int show_stat(struct seq_file
*p
, void *v
)
325 cputime64_t user
, nice
, system
, idle
, iowait
, irq
, softirq
, steal
;
328 user
= nice
= system
= idle
= iowait
=
329 irq
= softirq
= steal
= cputime64_zero
;
330 jif
= - wall_to_monotonic
.tv_sec
;
331 if (wall_to_monotonic
.tv_nsec
)
337 user
= cputime64_add(user
, kstat_cpu(i
).cpustat
.user
);
338 nice
= cputime64_add(nice
, kstat_cpu(i
).cpustat
.nice
);
339 system
= cputime64_add(system
, kstat_cpu(i
).cpustat
.system
);
340 idle
= cputime64_add(idle
, kstat_cpu(i
).cpustat
.idle
);
341 iowait
= cputime64_add(iowait
, kstat_cpu(i
).cpustat
.iowait
);
342 irq
= cputime64_add(irq
, kstat_cpu(i
).cpustat
.irq
);
343 softirq
= cputime64_add(softirq
, kstat_cpu(i
).cpustat
.softirq
);
344 steal
= cputime64_add(steal
, kstat_cpu(i
).cpustat
.steal
);
345 for (j
= 0 ; j
< NR_IRQS
; j
++)
346 sum
+= kstat_cpu(i
).irqs
[j
];
349 seq_printf(p
, "cpu %llu %llu %llu %llu %llu %llu %llu %llu\n",
350 (unsigned long long)cputime64_to_clock_t(user
),
351 (unsigned long long)cputime64_to_clock_t(nice
),
352 (unsigned long long)cputime64_to_clock_t(system
),
353 (unsigned long long)cputime64_to_clock_t(idle
),
354 (unsigned long long)cputime64_to_clock_t(iowait
),
355 (unsigned long long)cputime64_to_clock_t(irq
),
356 (unsigned long long)cputime64_to_clock_t(softirq
),
357 (unsigned long long)cputime64_to_clock_t(steal
));
358 for_each_online_cpu(i
) {
360 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
361 user
= kstat_cpu(i
).cpustat
.user
;
362 nice
= kstat_cpu(i
).cpustat
.nice
;
363 system
= kstat_cpu(i
).cpustat
.system
;
364 idle
= kstat_cpu(i
).cpustat
.idle
;
365 iowait
= kstat_cpu(i
).cpustat
.iowait
;
366 irq
= kstat_cpu(i
).cpustat
.irq
;
367 softirq
= kstat_cpu(i
).cpustat
.softirq
;
368 steal
= kstat_cpu(i
).cpustat
.steal
;
369 seq_printf(p
, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu\n",
371 (unsigned long long)cputime64_to_clock_t(user
),
372 (unsigned long long)cputime64_to_clock_t(nice
),
373 (unsigned long long)cputime64_to_clock_t(system
),
374 (unsigned long long)cputime64_to_clock_t(idle
),
375 (unsigned long long)cputime64_to_clock_t(iowait
),
376 (unsigned long long)cputime64_to_clock_t(irq
),
377 (unsigned long long)cputime64_to_clock_t(softirq
),
378 (unsigned long long)cputime64_to_clock_t(steal
));
380 seq_printf(p
, "intr %llu", (unsigned long long)sum
);
382 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA)
383 for (i
= 0; i
< NR_IRQS
; i
++)
384 seq_printf(p
, " %u", kstat_irqs(i
));
391 "procs_running %lu\n"
392 "procs_blocked %lu\n",
393 nr_context_switches(),
402 static int stat_open(struct inode
*inode
, struct file
*file
)
404 unsigned size
= 4096 * (1 + num_possible_cpus() / 32);
409 /* don't ask for more than the kmalloc() max size, currently 128 KB */
410 if (size
> 128 * 1024)
412 buf
= kmalloc(size
, GFP_KERNEL
);
416 res
= single_open(file
, show_stat
, NULL
);
418 m
= file
->private_data
;
425 static struct file_operations proc_stat_operations
= {
429 .release
= single_release
,
432 static int devices_read_proc(char *page
, char **start
, off_t off
,
433 int count
, int *eof
, void *data
)
435 int len
= get_chrdev_list(page
);
436 len
+= get_blkdev_list(page
+len
);
437 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
443 static void *int_seq_start(struct seq_file
*f
, loff_t
*pos
)
445 return (*pos
<= NR_IRQS
) ? pos
: NULL
;
448 static void *int_seq_next(struct seq_file
*f
, void *v
, loff_t
*pos
)
456 static void int_seq_stop(struct seq_file
*f
, void *v
)
462 extern int show_interrupts(struct seq_file
*f
, void *v
); /* In arch code */
463 static struct seq_operations int_seq_ops
= {
464 .start
= int_seq_start
,
465 .next
= int_seq_next
,
466 .stop
= int_seq_stop
,
467 .show
= show_interrupts
470 static int interrupts_open(struct inode
*inode
, struct file
*filp
)
472 return seq_open(filp
, &int_seq_ops
);
475 static struct file_operations proc_interrupts_operations
= {
476 .open
= interrupts_open
,
479 .release
= seq_release
,
482 static int filesystems_read_proc(char *page
, char **start
, off_t off
,
483 int count
, int *eof
, void *data
)
485 int len
= get_filesystem_list(page
);
486 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
489 static int cmdline_read_proc(char *page
, char **start
, off_t off
,
490 int count
, int *eof
, void *data
)
494 len
= sprintf(page
, "%s\n", saved_command_line
);
495 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
498 static int locks_read_proc(char *page
, char **start
, off_t off
,
499 int count
, int *eof
, void *data
)
501 int len
= get_locks_status(page
, start
, off
, count
);
508 static int execdomains_read_proc(char *page
, char **start
, off_t off
,
509 int count
, int *eof
, void *data
)
511 int len
= get_exec_domain_list(page
);
512 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
515 #ifdef CONFIG_MAGIC_SYSRQ
517 * writing 'C' to /proc/sysrq-trigger is like sysrq-C
519 static ssize_t
write_sysrq_trigger(struct file
*file
, const char __user
*buf
,
520 size_t count
, loff_t
*ppos
)
525 if (get_user(c
, buf
))
527 __handle_sysrq(c
, NULL
, NULL
, 0);
532 static struct file_operations proc_sysrq_trigger_operations
= {
533 .write
= write_sysrq_trigger
,
537 struct proc_dir_entry
*proc_root_kcore
;
539 void create_seq_entry(char *name
, mode_t mode
, struct file_operations
*f
)
541 struct proc_dir_entry
*entry
;
542 entry
= create_proc_entry(name
, mode
, NULL
);
544 entry
->proc_fops
= f
;
547 void __init
proc_misc_init(void)
549 struct proc_dir_entry
*entry
;
552 int (*read_proc
)(char*,char**,off_t
,int,int*,void*);
553 } *p
, simple_ones
[] = {
554 {"loadavg", loadavg_read_proc
},
555 {"uptime", uptime_read_proc
},
556 {"meminfo", meminfo_read_proc
},
557 {"version", version_read_proc
},
558 #ifdef CONFIG_PROC_HARDWARE
559 {"hardware", hardware_read_proc
},
561 #ifdef CONFIG_STRAM_PROC
562 {"stram", stram_read_proc
},
564 {"devices", devices_read_proc
},
565 {"filesystems", filesystems_read_proc
},
566 {"cmdline", cmdline_read_proc
},
567 {"locks", locks_read_proc
},
568 {"execdomains", execdomains_read_proc
},
571 for (p
= simple_ones
; p
->name
; p
++)
572 create_proc_read_entry(p
->name
, 0, NULL
, p
->read_proc
, NULL
);
574 proc_symlink("mounts", NULL
, "self/mounts");
576 /* And now for trickier ones */
577 entry
= create_proc_entry("kmsg", S_IRUSR
, &proc_root
);
579 entry
->proc_fops
= &proc_kmsg_operations
;
580 create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations
);
581 create_seq_entry("partitions", 0, &proc_partitions_operations
);
582 create_seq_entry("stat", 0, &proc_stat_operations
);
583 create_seq_entry("interrupts", 0, &proc_interrupts_operations
);
584 create_seq_entry("slabinfo",S_IWUSR
|S_IRUGO
,&proc_slabinfo_operations
);
585 create_seq_entry("buddyinfo",S_IRUGO
, &fragmentation_file_operations
);
586 create_seq_entry("vmstat",S_IRUGO
, &proc_vmstat_file_operations
);
587 create_seq_entry("diskstats", 0, &proc_diskstats_operations
);
588 #ifdef CONFIG_MODULES
589 create_seq_entry("modules", 0, &proc_modules_operations
);
591 #ifdef CONFIG_SCHEDSTATS
592 create_seq_entry("schedstat", 0, &proc_schedstat_operations
);
594 #ifdef CONFIG_PROC_KCORE
595 proc_root_kcore
= create_proc_entry("kcore", S_IRUSR
, NULL
);
596 if (proc_root_kcore
) {
597 proc_root_kcore
->proc_fops
= &proc_kcore_operations
;
598 proc_root_kcore
->size
=
599 (size_t)high_memory
- PAGE_OFFSET
+ PAGE_SIZE
;
602 #ifdef CONFIG_MAGIC_SYSRQ
603 entry
= create_proc_entry("sysrq-trigger", S_IWUSR
, NULL
);
605 entry
->proc_fops
= &proc_sysrq_trigger_operations
;
609 extern struct file_operations ppc_htab_operations
;
610 entry
= create_proc_entry("ppc_htab", S_IRUGO
|S_IWUSR
, NULL
);
612 entry
->proc_fops
= &ppc_htab_operations
;