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>
53 #define LOAD_INT(x) ((x) >> FSHIFT)
54 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
56 * Warning: stuff below (imported functions) assumes that its output will fit
57 * into one page. For some of those functions it may be wrong. Moreover, we
58 * have a way to deal with that gracefully. Right now I used straightforward
59 * wrappers, but this needs further analysis wrt potential overflows.
61 extern int get_hardware_list(char *);
62 extern int get_stram_list(char *);
63 extern int get_chrdev_list(char *);
64 extern int get_blkdev_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
);
100 unsigned long largest_chunk
;
103 static struct vmalloc_info
get_vmalloc_info(void)
105 unsigned long prev_end
= VMALLOC_START
;
106 struct vm_struct
* vma
;
107 struct vmalloc_info vmi
;
110 read_lock(&vmlist_lock
);
113 vmi
.largest_chunk
= (VMALLOC_END
-VMALLOC_START
);
115 vmi
.largest_chunk
= 0;
117 for (vma
= vmlist
; vma
; vma
= vma
->next
) {
118 unsigned long free_area_size
=
119 (unsigned long)vma
->addr
- prev_end
;
120 vmi
.used
+= vma
->size
;
121 if (vmi
.largest_chunk
< free_area_size
)
123 vmi
.largest_chunk
= free_area_size
;
124 prev_end
= vma
->size
+ (unsigned long)vma
->addr
;
126 if(VMALLOC_END
-prev_end
> vmi
.largest_chunk
)
127 vmi
.largest_chunk
= VMALLOC_END
-prev_end
;
129 read_unlock(&vmlist_lock
);
133 static int uptime_read_proc(char *page
, char **start
, off_t off
,
134 int count
, int *eof
, void *data
)
136 struct timespec uptime
;
137 struct timespec idle
;
139 u64 idle_jiffies
= init_task
.utime
+ init_task
.stime
;
141 do_posix_clock_monotonic_gettime(&uptime
);
142 jiffies_to_timespec(idle_jiffies
, &idle
);
143 len
= sprintf(page
,"%lu.%02lu %lu.%02lu\n",
144 (unsigned long) uptime
.tv_sec
,
145 (uptime
.tv_nsec
/ (NSEC_PER_SEC
/ 100)),
146 (unsigned long) idle
.tv_sec
,
147 (idle
.tv_nsec
/ (NSEC_PER_SEC
/ 100)));
149 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
152 static int meminfo_read_proc(char *page
, char **start
, off_t off
,
153 int count
, int *eof
, void *data
)
157 struct page_state ps
;
158 unsigned long inactive
;
159 unsigned long active
;
162 struct vmalloc_info vmi
;
165 get_zone_counts(&active
, &inactive
, &free
);
168 * display in kilobytes.
170 #define K(x) ((x) << (PAGE_SHIFT - 10))
173 committed
= atomic_read(&vm_committed_space
);
175 vmtot
= (VMALLOC_END
-VMALLOC_START
)>>10;
176 vmi
= get_vmalloc_info();
178 vmi
.largest_chunk
>>= 10;
181 * Tagged format, for easy grepping and expansion.
184 "MemTotal: %8lu kB\n"
188 "SwapCached: %8lu kB\n"
190 "Inactive: %8lu kB\n"
191 "HighTotal: %8lu kB\n"
192 "HighFree: %8lu kB\n"
193 "LowTotal: %8lu kB\n"
195 "SwapTotal: %8lu kB\n"
196 "SwapFree: %8lu kB\n"
198 "Writeback: %8lu kB\n"
201 "Committed_AS: %8u kB\n"
202 "PageTables: %8lu kB\n"
203 "VmallocTotal: %8lu kB\n"
204 "VmallocUsed: %8lu kB\n"
205 "VmallocChunk: %8lu kB\n",
209 K(get_page_cache_size()-total_swapcache_pages
-i
.bufferram
),
210 K(total_swapcache_pages
),
215 K(i
.totalram
-i
.totalhigh
),
216 K(i
.freeram
-i
.freehigh
),
224 K(ps
.nr_page_table_pages
),
230 len
+= hugetlb_report_meminfo(page
+ len
);
232 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
236 extern struct seq_operations fragmentation_op
;
237 static int fragmentation_open(struct inode
*inode
, struct file
*file
)
240 return seq_open(file
, &fragmentation_op
);
243 static struct file_operations fragmentation_file_operations
= {
244 .open
= fragmentation_open
,
247 .release
= seq_release
,
250 static int version_read_proc(char *page
, char **start
, off_t off
,
251 int count
, int *eof
, void *data
)
253 extern char *linux_banner
;
256 strcpy(page
, linux_banner
);
258 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
261 extern struct seq_operations cpuinfo_op
;
262 static int cpuinfo_open(struct inode
*inode
, struct file
*file
)
264 return seq_open(file
, &cpuinfo_op
);
266 static struct file_operations proc_cpuinfo_operations
= {
267 .open
= cpuinfo_open
,
270 .release
= seq_release
,
273 extern struct seq_operations vmstat_op
;
274 static int vmstat_open(struct inode
*inode
, struct file
*file
)
276 return seq_open(file
, &vmstat_op
);
278 static struct file_operations proc_vmstat_file_operations
= {
282 .release
= seq_release
,
285 #ifdef CONFIG_PROC_HARDWARE
286 static int hardware_read_proc(char *page
, char **start
, off_t off
,
287 int count
, int *eof
, void *data
)
289 int len
= get_hardware_list(page
);
290 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
294 #ifdef CONFIG_STRAM_PROC
295 static int stram_read_proc(char *page
, char **start
, off_t off
,
296 int count
, int *eof
, void *data
)
298 int len
= get_stram_list(page
);
299 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
303 extern struct seq_operations partitions_op
;
304 static int partitions_open(struct inode
*inode
, struct file
*file
)
306 return seq_open(file
, &partitions_op
);
308 static struct file_operations proc_partitions_operations
= {
309 .open
= partitions_open
,
312 .release
= seq_release
,
315 extern struct seq_operations diskstats_op
;
316 static int diskstats_open(struct inode
*inode
, struct file
*file
)
318 return seq_open(file
, &diskstats_op
);
320 static struct file_operations proc_diskstats_operations
= {
321 .open
= diskstats_open
,
324 .release
= seq_release
,
327 #ifdef CONFIG_MODULES
328 extern struct seq_operations modules_op
;
329 static int modules_open(struct inode
*inode
, struct file
*file
)
331 return seq_open(file
, &modules_op
);
333 static struct file_operations proc_modules_operations
= {
334 .open
= modules_open
,
337 .release
= seq_release
,
341 extern struct seq_operations slabinfo_op
;
342 extern ssize_t
slabinfo_write(struct file
*, const char __user
*, size_t, loff_t
*);
343 static int slabinfo_open(struct inode
*inode
, struct file
*file
)
345 return seq_open(file
, &slabinfo_op
);
347 static struct file_operations proc_slabinfo_operations
= {
348 .open
= slabinfo_open
,
350 .write
= slabinfo_write
,
352 .release
= seq_release
,
355 int show_stat(struct seq_file
*p
, void *v
)
358 extern unsigned long total_forks
;
360 u64 sum
= 0, user
= 0, nice
= 0, system
= 0,
361 idle
= 0, iowait
= 0, irq
= 0, softirq
= 0;
363 jif
= - wall_to_monotonic
.tv_sec
;
364 if (wall_to_monotonic
.tv_nsec
)
370 user
+= kstat_cpu(i
).cpustat
.user
;
371 nice
+= kstat_cpu(i
).cpustat
.nice
;
372 system
+= kstat_cpu(i
).cpustat
.system
;
373 idle
+= kstat_cpu(i
).cpustat
.idle
;
374 iowait
+= kstat_cpu(i
).cpustat
.iowait
;
375 irq
+= kstat_cpu(i
).cpustat
.irq
;
376 softirq
+= kstat_cpu(i
).cpustat
.softirq
;
377 for (j
= 0 ; j
< NR_IRQS
; j
++)
378 sum
+= kstat_cpu(i
).irqs
[j
];
381 seq_printf(p
, "cpu %llu %llu %llu %llu %llu %llu %llu\n",
382 (unsigned long long)jiffies_64_to_clock_t(user
),
383 (unsigned long long)jiffies_64_to_clock_t(nice
),
384 (unsigned long long)jiffies_64_to_clock_t(system
),
385 (unsigned long long)jiffies_64_to_clock_t(idle
),
386 (unsigned long long)jiffies_64_to_clock_t(iowait
),
387 (unsigned long long)jiffies_64_to_clock_t(irq
),
388 (unsigned long long)jiffies_64_to_clock_t(softirq
));
389 for_each_online_cpu(i
) {
391 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
392 user
= kstat_cpu(i
).cpustat
.user
;
393 nice
= kstat_cpu(i
).cpustat
.nice
;
394 system
= kstat_cpu(i
).cpustat
.system
;
395 idle
= kstat_cpu(i
).cpustat
.idle
;
396 iowait
= kstat_cpu(i
).cpustat
.iowait
;
397 irq
= kstat_cpu(i
).cpustat
.irq
;
398 softirq
= kstat_cpu(i
).cpustat
.softirq
;
399 seq_printf(p
, "cpu%d %llu %llu %llu %llu %llu %llu %llu\n",
401 (unsigned long long)jiffies_64_to_clock_t(user
),
402 (unsigned long long)jiffies_64_to_clock_t(nice
),
403 (unsigned long long)jiffies_64_to_clock_t(system
),
404 (unsigned long long)jiffies_64_to_clock_t(idle
),
405 (unsigned long long)jiffies_64_to_clock_t(iowait
),
406 (unsigned long long)jiffies_64_to_clock_t(irq
),
407 (unsigned long long)jiffies_64_to_clock_t(softirq
));
409 seq_printf(p
, "intr %llu", (unsigned long long)sum
);
411 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA)
412 for (i
= 0; i
< NR_IRQS
; i
++)
413 seq_printf(p
, " %u", kstat_irqs(i
));
420 "procs_running %lu\n"
421 "procs_blocked %lu\n",
422 nr_context_switches(),
431 static int stat_open(struct inode
*inode
, struct file
*file
)
433 unsigned size
= 4096 * (1 + num_possible_cpus() / 32);
438 /* don't ask for more than the kmalloc() max size, currently 128 KB */
439 if (size
> 128 * 1024)
441 buf
= kmalloc(size
, GFP_KERNEL
);
445 res
= single_open(file
, show_stat
, NULL
);
447 m
= file
->private_data
;
454 static struct file_operations proc_stat_operations
= {
458 .release
= single_release
,
461 static int devices_read_proc(char *page
, char **start
, off_t off
,
462 int count
, int *eof
, void *data
)
464 int len
= get_chrdev_list(page
);
465 len
+= get_blkdev_list(page
+len
);
466 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
472 static void *int_seq_start(struct seq_file
*f
, loff_t
*pos
)
474 return (*pos
<= NR_IRQS
) ? pos
: NULL
;
477 static void *int_seq_next(struct seq_file
*f
, void *v
, loff_t
*pos
)
485 static void int_seq_stop(struct seq_file
*f
, void *v
)
491 extern int show_interrupts(struct seq_file
*f
, void *v
); /* In arch code */
492 static struct seq_operations int_seq_ops
= {
493 .start
= int_seq_start
,
494 .next
= int_seq_next
,
495 .stop
= int_seq_stop
,
496 .show
= show_interrupts
499 int interrupts_open(struct inode
*inode
, struct file
*filp
)
501 return seq_open(filp
, &int_seq_ops
);
504 static struct file_operations proc_interrupts_operations
= {
505 .open
= interrupts_open
,
508 .release
= seq_release
,
511 static int filesystems_read_proc(char *page
, char **start
, off_t off
,
512 int count
, int *eof
, void *data
)
514 int len
= get_filesystem_list(page
);
515 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
518 static int cmdline_read_proc(char *page
, char **start
, off_t off
,
519 int count
, int *eof
, void *data
)
523 len
= sprintf(page
, "%s\n", saved_command_line
);
524 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
527 static int locks_read_proc(char *page
, char **start
, off_t off
,
528 int count
, int *eof
, void *data
)
530 int len
= get_locks_status(page
, start
, off
, count
);
537 static int execdomains_read_proc(char *page
, char **start
, off_t off
,
538 int count
, int *eof
, void *data
)
540 int len
= get_exec_domain_list(page
);
541 return proc_calc_metrics(page
, start
, off
, count
, eof
, len
);
544 #ifdef CONFIG_MAGIC_SYSRQ
546 * writing 'C' to /proc/sysrq-trigger is like sysrq-C
548 static ssize_t
write_sysrq_trigger(struct file
*file
, const char __user
*buf
,
549 size_t count
, loff_t
*ppos
)
554 if (get_user(c
, buf
))
556 __handle_sysrq(c
, NULL
, NULL
);
561 static struct file_operations proc_sysrq_trigger_operations
= {
562 .write
= write_sysrq_trigger
,
566 struct proc_dir_entry
*proc_root_kcore
;
568 static void create_seq_entry(char *name
, mode_t mode
, struct file_operations
*f
)
570 struct proc_dir_entry
*entry
;
571 entry
= create_proc_entry(name
, mode
, NULL
);
573 entry
->proc_fops
= f
;
576 void __init
proc_misc_init(void)
578 struct proc_dir_entry
*entry
;
581 int (*read_proc
)(char*,char**,off_t
,int,int*,void*);
582 } *p
, simple_ones
[] = {
583 {"loadavg", loadavg_read_proc
},
584 {"uptime", uptime_read_proc
},
585 {"meminfo", meminfo_read_proc
},
586 {"version", version_read_proc
},
587 #ifdef CONFIG_PROC_HARDWARE
588 {"hardware", hardware_read_proc
},
590 #ifdef CONFIG_STRAM_PROC
591 {"stram", stram_read_proc
},
593 {"devices", devices_read_proc
},
594 {"filesystems", filesystems_read_proc
},
595 {"cmdline", cmdline_read_proc
},
596 {"locks", locks_read_proc
},
597 {"execdomains", execdomains_read_proc
},
600 for (p
= simple_ones
; p
->name
; p
++)
601 create_proc_read_entry(p
->name
, 0, NULL
, p
->read_proc
, NULL
);
603 proc_symlink("mounts", NULL
, "self/mounts");
605 /* And now for trickier ones */
606 entry
= create_proc_entry("kmsg", S_IRUSR
, &proc_root
);
608 entry
->proc_fops
= &proc_kmsg_operations
;
609 create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations
);
610 create_seq_entry("partitions", 0, &proc_partitions_operations
);
611 create_seq_entry("stat", 0, &proc_stat_operations
);
612 create_seq_entry("interrupts", 0, &proc_interrupts_operations
);
613 create_seq_entry("slabinfo",S_IWUSR
|S_IRUGO
,&proc_slabinfo_operations
);
614 create_seq_entry("buddyinfo",S_IRUGO
, &fragmentation_file_operations
);
615 create_seq_entry("vmstat",S_IRUGO
, &proc_vmstat_file_operations
);
616 create_seq_entry("diskstats", 0, &proc_diskstats_operations
);
617 #ifdef CONFIG_MODULES
618 create_seq_entry("modules", 0, &proc_modules_operations
);
620 #ifdef CONFIG_SCHEDSTATS
621 create_seq_entry("schedstat", 0, &proc_schedstat_operations
);
623 #ifdef CONFIG_PROC_KCORE
624 proc_root_kcore
= create_proc_entry("kcore", S_IRUSR
, NULL
);
625 if (proc_root_kcore
) {
626 proc_root_kcore
->proc_fops
= &proc_kcore_operations
;
627 proc_root_kcore
->size
=
628 (size_t)high_memory
- PAGE_OFFSET
+ PAGE_SIZE
;
631 #ifdef CONFIG_MAGIC_SYSRQ
632 entry
= create_proc_entry("sysrq-trigger", S_IWUSR
, NULL
);
634 entry
->proc_fops
= &proc_sysrq_trigger_operations
;
638 extern struct file_operations ppc_htab_operations
;
639 entry
= create_proc_entry("ppc_htab", S_IRUGO
|S_IWUSR
, NULL
);
641 entry
->proc_fops
= &ppc_htab_operations
;