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authorStefani Seibold <stefani@seibold.net>2009-06-17 19:26:01 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-18 16:03:41 -0400
commit349888ee7b2c1ffb44c806adf6f4289ca4a6fd42 (patch)
tree841552b3ed0c3140be1904c82ffc0149f32491b1 /Documentation
parent2f6d311080c36e30a5fa87adca550dc6b51dbfdc (diff)
proc.txt: update kernel filesystem/proc.txt documentation
An update for the "Process-Specific Subdirectories" section to reflect the changes till kernel 2.6.30. Signed-off-by: Stefani Seibold <stefani@seibold.net> Cc: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/filesystems/proc.txt242
1 files changed, 190 insertions, 52 deletions
diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index fb7d649437af..fad18f9456e4 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -5,11 +5,12 @@
5 Bodo Bauer <bb@ricochet.net> 5 Bodo Bauer <bb@ricochet.net>
6 6
72.4.x update Jorge Nerin <comandante@zaralinux.com> November 14 2000 72.4.x update Jorge Nerin <comandante@zaralinux.com> November 14 2000
8move /proc/sys Shen Feng <shen@cn.fujitsu.com> April 1 2009 8move /proc/sys Shen Feng <shen@cn.fujitsu.com> April 1 2009
9------------------------------------------------------------------------------ 9------------------------------------------------------------------------------
10Version 1.3 Kernel version 2.2.12 10Version 1.3 Kernel version 2.2.12
11 Kernel version 2.4.0-test11-pre4 11 Kernel version 2.4.0-test11-pre4
12------------------------------------------------------------------------------ 12------------------------------------------------------------------------------
13fixes/update part 1.1 Stefani Seibold <stefani@seibold.net> June 9 2009
13 14
14Table of Contents 15Table of Contents
15----------------- 16-----------------
@@ -116,7 +117,7 @@ The link self points to the process reading the file system. Each process
116subdirectory has the entries listed in Table 1-1. 117subdirectory has the entries listed in Table 1-1.
117 118
118 119
119Table 1-1: Process specific entries in /proc 120Table 1-1: Process specific entries in /proc
120.............................................................................. 121..............................................................................
121 File Content 122 File Content
122 clear_refs Clears page referenced bits shown in smaps output 123 clear_refs Clears page referenced bits shown in smaps output
@@ -134,46 +135,103 @@ Table 1-1: Process specific entries in /proc
134 status Process status in human readable form 135 status Process status in human readable form
135 wchan If CONFIG_KALLSYMS is set, a pre-decoded wchan 136 wchan If CONFIG_KALLSYMS is set, a pre-decoded wchan
136 stack Report full stack trace, enable via CONFIG_STACKTRACE 137 stack Report full stack trace, enable via CONFIG_STACKTRACE
137 smaps Extension based on maps, the rss size for each mapped file 138 smaps a extension based on maps, showing the memory consumption of
139 each mapping
138.............................................................................. 140..............................................................................
139 141
140For example, to get the status information of a process, all you have to do is 142For example, to get the status information of a process, all you have to do is
141read the file /proc/PID/status: 143read the file /proc/PID/status:
142 144
143 >cat /proc/self/status 145 >cat /proc/self/status
144 Name: cat 146 Name: cat
145 State: R (running) 147 State: R (running)
146 Pid: 5452 148 Tgid: 5452
147 PPid: 743 149 Pid: 5452
150 PPid: 743
148 TracerPid: 0 (2.4) 151 TracerPid: 0 (2.4)
149 Uid: 501 501 501 501 152 Uid: 501 501 501 501
150 Gid: 100 100 100 100 153 Gid: 100 100 100 100
151 Groups: 100 14 16 154 FDSize: 256
152 VmSize: 1112 kB 155 Groups: 100 14 16
153 VmLck: 0 kB 156 VmPeak: 5004 kB
154 VmRSS: 348 kB 157 VmSize: 5004 kB
155 VmData: 24 kB 158 VmLck: 0 kB
156 VmStk: 12 kB 159 VmHWM: 476 kB
157 VmExe: 8 kB 160 VmRSS: 476 kB
158 VmLib: 1044 kB 161 VmData: 156 kB
159 SigPnd: 0000000000000000 162 VmStk: 88 kB
160 SigBlk: 0000000000000000 163 VmExe: 68 kB
161 SigIgn: 0000000000000000 164 VmLib: 1412 kB
162 SigCgt: 0000000000000000 165 VmPTE: 20 kb
163 CapInh: 00000000fffffeff 166 Threads: 1
164 CapPrm: 0000000000000000 167 SigQ: 0/28578
165 CapEff: 0000000000000000 168 SigPnd: 0000000000000000
166 169 ShdPnd: 0000000000000000
170 SigBlk: 0000000000000000
171 SigIgn: 0000000000000000
172 SigCgt: 0000000000000000
173 CapInh: 00000000fffffeff
174 CapPrm: 0000000000000000
175 CapEff: 0000000000000000
176 CapBnd: ffffffffffffffff
177 voluntary_ctxt_switches: 0
178 nonvoluntary_ctxt_switches: 1
167 179
168This shows you nearly the same information you would get if you viewed it with 180This shows you nearly the same information you would get if you viewed it with
169the ps command. In fact, ps uses the proc file system to obtain its 181the ps command. In fact, ps uses the proc file system to obtain its
170information. The statm file contains more detailed information about the 182information. But you get a more detailed view of the process by reading the
171process memory usage. Its seven fields are explained in Table 1-2. The stat 183file /proc/PID/status. It fields are described in table 1-2.
172file contains details information about the process itself. Its fields are 184
173explained in Table 1-3. 185The statm file contains more detailed information about the process
186memory usage. Its seven fields are explained in Table 1-3. The stat file
187contains details information about the process itself. Its fields are
188explained in Table 1-4.
174 189
190Table 1-2: Contents of the statm files (as of 2.6.30-rc7)
191..............................................................................
192 Field Content
193 Name filename of the executable
194 State state (R is running, S is sleeping, D is sleeping
195 in an uninterruptible wait, Z is zombie,
196 T is traced or stopped)
197 Tgid thread group ID
198 Pid process id
199 PPid process id of the parent process
200 TracerPid PID of process tracing this process (0 if not)
201 Uid Real, effective, saved set, and file system UIDs
202 Gid Real, effective, saved set, and file system GIDs
203 FDSize number of file descriptor slots currently allocated
204 Groups supplementary group list
205 VmPeak peak virtual memory size
206 VmSize total program size
207 VmLck locked memory size
208 VmHWM peak resident set size ("high water mark")
209 VmRSS size of memory portions
210 VmData size of data, stack, and text segments
211 VmStk size of data, stack, and text segments
212 VmExe size of text segment
213 VmLib size of shared library code
214 VmPTE size of page table entries
215 Threads number of threads
216 SigQ number of signals queued/max. number for queue
217 SigPnd bitmap of pending signals for the thread
218 ShdPnd bitmap of shared pending signals for the process
219 SigBlk bitmap of blocked signals
220 SigIgn bitmap of ignored signals
221 SigCgt bitmap of catched signals
222 CapInh bitmap of inheritable capabilities
223 CapPrm bitmap of permitted capabilities
224 CapEff bitmap of effective capabilities
225 CapBnd bitmap of capabilities bounding set
226 Cpus_allowed mask of CPUs on which this process may run
227 Cpus_allowed_list Same as previous, but in "list format"
228 Mems_allowed mask of memory nodes allowed to this process
229 Mems_allowed_list Same as previous, but in "list format"
230 voluntary_ctxt_switches number of voluntary context switches
231 nonvoluntary_ctxt_switches number of non voluntary context switches
232..............................................................................
175 233
176Table 1-2: Contents of the statm files (as of 2.6.8-rc3) 234Table 1-3: Contents of the statm files (as of 2.6.8-rc3)
177.............................................................................. 235..............................................................................
178 Field Content 236 Field Content
179 size total program size (pages) (same as VmSize in status) 237 size total program size (pages) (same as VmSize in status)
@@ -188,7 +246,7 @@ Table 1-2: Contents of the statm files (as of 2.6.8-rc3)
188.............................................................................. 246..............................................................................
189 247
190 248
191Table 1-3: Contents of the stat files (as of 2.6.22-rc3) 249Table 1-4: Contents of the stat files (as of 2.6.30-rc7)
192.............................................................................. 250..............................................................................
193 Field Content 251 Field Content
194 pid process id 252 pid process id
@@ -222,10 +280,10 @@ Table 1-3: Contents of the stat files (as of 2.6.22-rc3)
222 start_stack address of the start of the stack 280 start_stack address of the start of the stack
223 esp current value of ESP 281 esp current value of ESP
224 eip current value of EIP 282 eip current value of EIP
225 pending bitmap of pending signals (obsolete) 283 pending bitmap of pending signals
226 blocked bitmap of blocked signals (obsolete) 284 blocked bitmap of blocked signals
227 sigign bitmap of ignored signals (obsolete) 285 sigign bitmap of ignored signals
228 sigcatch bitmap of catched signals (obsolete) 286 sigcatch bitmap of catched signals
229 wchan address where process went to sleep 287 wchan address where process went to sleep
230 0 (place holder) 288 0 (place holder)
231 0 (place holder) 289 0 (place holder)
@@ -234,19 +292,99 @@ Table 1-3: Contents of the stat files (as of 2.6.22-rc3)
234 rt_priority realtime priority 292 rt_priority realtime priority
235 policy scheduling policy (man sched_setscheduler) 293 policy scheduling policy (man sched_setscheduler)
236 blkio_ticks time spent waiting for block IO 294 blkio_ticks time spent waiting for block IO
295 gtime guest time of the task in jiffies
296 cgtime guest time of the task children in jiffies
237.............................................................................. 297..............................................................................
238 298
299The /proc/PID/map file containing the currently mapped memory regions and
300their access permissions.
301
302The format is:
303
304address perms offset dev inode pathname
305
30608048000-08049000 r-xp 00000000 03:00 8312 /opt/test
30708049000-0804a000 rw-p 00001000 03:00 8312 /opt/test
3080804a000-0806b000 rw-p 00000000 00:00 0 [heap]
309a7cb1000-a7cb2000 ---p 00000000 00:00 0
310a7cb2000-a7eb2000 rw-p 00000000 00:00 0
311a7eb2000-a7eb3000 ---p 00000000 00:00 0
312a7eb3000-a7ed5000 rw-p 00000000 00:00 0
313a7ed5000-a8008000 r-xp 00000000 03:00 4222 /lib/libc.so.6
314a8008000-a800a000 r--p 00133000 03:00 4222 /lib/libc.so.6
315a800a000-a800b000 rw-p 00135000 03:00 4222 /lib/libc.so.6
316a800b000-a800e000 rw-p 00000000 00:00 0
317a800e000-a8022000 r-xp 00000000 03:00 14462 /lib/libpthread.so.0
318a8022000-a8023000 r--p 00013000 03:00 14462 /lib/libpthread.so.0
319a8023000-a8024000 rw-p 00014000 03:00 14462 /lib/libpthread.so.0
320a8024000-a8027000 rw-p 00000000 00:00 0
321a8027000-a8043000 r-xp 00000000 03:00 8317 /lib/ld-linux.so.2
322a8043000-a8044000 r--p 0001b000 03:00 8317 /lib/ld-linux.so.2
323a8044000-a8045000 rw-p 0001c000 03:00 8317 /lib/ld-linux.so.2
324aff35000-aff4a000 rw-p 00000000 00:00 0 [stack]
325ffffe000-fffff000 r-xp 00000000 00:00 0 [vdso]
326
327where "address" is the address space in the process that it occupies, "perms"
328is a set of permissions:
329
330 r = read
331 w = write
332 x = execute
333 s = shared
334 p = private (copy on write)
335
336"offset" is the offset into the mapping, "dev" is the device (major:minor), and
337"inode" is the inode on that device. 0 indicates that no inode is associated
338with the memory region, as the case would be with BSS (uninitialized data).
339The "pathname" shows the name associated file for this mapping. If the mapping
340is not associated with a file:
341
342 [heap] = the heap of the program
343 [stack] = the stack of the main process
344 [vdso] = the "virtual dynamic shared object",
345 the kernel system call handler
346
347 or if empty, the mapping is anonymous.
348
349
350The /proc/PID/smaps is an extension based on maps, showing the memory
351consumption for each of the process's mappings. For each of mappings there
352is a series of lines such as the following:
353
35408048000-080bc000 r-xp 00000000 03:02 13130 /bin/bash
355Size: 1084 kB
356Rss: 892 kB
357Pss: 374 kB
358Shared_Clean: 892 kB
359Shared_Dirty: 0 kB
360Private_Clean: 0 kB
361Private_Dirty: 0 kB
362Referenced: 892 kB
363Swap: 0 kB
364KernelPageSize: 4 kB
365MMUPageSize: 4 kB
366
367The first of these lines shows the same information as is displayed for the
368mapping in /proc/PID/maps. The remaining lines show the size of the mapping,
369the amount of the mapping that is currently resident in RAM, the "proportional
370set size” (divide each shared page by the number of processes sharing it), the
371number of clean and dirty shared pages in the mapping, and the number of clean
372and dirty private pages in the mapping. The "Referenced" indicates the amount
373of memory currently marked as referenced or accessed.
374
375This file is only present if the CONFIG_MMU kernel configuration option is
376enabled.
239 377
2401.2 Kernel data 3781.2 Kernel data
241--------------- 379---------------
242 380
243Similar to the process entries, the kernel data files give information about 381Similar to the process entries, the kernel data files give information about
244the running kernel. The files used to obtain this information are contained in 382the running kernel. The files used to obtain this information are contained in
245/proc and are listed in Table 1-4. Not all of these will be present in your 383/proc and are listed in Table 1-5. Not all of these will be present in your
246system. It depends on the kernel configuration and the loaded modules, which 384system. It depends on the kernel configuration and the loaded modules, which
247files are there, and which are missing. 385files are there, and which are missing.
248 386
249Table 1-4: Kernel info in /proc 387Table 1-5: Kernel info in /proc
250.............................................................................. 388..............................................................................
251 File Content 389 File Content
252 apm Advanced power management info 390 apm Advanced power management info
@@ -634,10 +772,10 @@ IDE devices:
634 772
635More detailed information can be found in the controller specific 773More detailed information can be found in the controller specific
636subdirectories. These are named ide0, ide1 and so on. Each of these 774subdirectories. These are named ide0, ide1 and so on. Each of these
637directories contains the files shown in table 1-5. 775directories contains the files shown in table 1-6.
638 776
639 777
640Table 1-5: IDE controller info in /proc/ide/ide? 778Table 1-6: IDE controller info in /proc/ide/ide?
641.............................................................................. 779..............................................................................
642 File Content 780 File Content
643 channel IDE channel (0 or 1) 781 channel IDE channel (0 or 1)
@@ -647,11 +785,11 @@ Table 1-5: IDE controller info in /proc/ide/ide?
647.............................................................................. 785..............................................................................
648 786
649Each device connected to a controller has a separate subdirectory in the 787Each device connected to a controller has a separate subdirectory in the
650controllers directory. The files listed in table 1-6 are contained in these 788controllers directory. The files listed in table 1-7 are contained in these
651directories. 789directories.
652 790
653 791
654Table 1-6: IDE device information 792Table 1-7: IDE device information
655.............................................................................. 793..............................................................................
656 File Content 794 File Content
657 cache The cache 795 cache The cache
@@ -693,12 +831,12 @@ the drive parameters:
6931.4 Networking info in /proc/net 8311.4 Networking info in /proc/net
694-------------------------------- 832--------------------------------
695 833
696The subdirectory /proc/net follows the usual pattern. Table 1-6 shows the 834The subdirectory /proc/net follows the usual pattern. Table 1-8 shows the
697additional values you get for IP version 6 if you configure the kernel to 835additional values you get for IP version 6 if you configure the kernel to
698support this. Table 1-7 lists the files and their meaning. 836support this. Table 1-9 lists the files and their meaning.
699 837
700 838
701Table 1-6: IPv6 info in /proc/net 839Table 1-8: IPv6 info in /proc/net
702.............................................................................. 840..............................................................................
703 File Content 841 File Content
704 udp6 UDP sockets (IPv6) 842 udp6 UDP sockets (IPv6)
@@ -713,7 +851,7 @@ Table 1-6: IPv6 info in /proc/net
713.............................................................................. 851..............................................................................
714 852
715 853
716Table 1-7: Network info in /proc/net 854Table 1-9: Network info in /proc/net
717.............................................................................. 855..............................................................................
718 File Content 856 File Content
719 arp Kernel ARP table 857 arp Kernel ARP table
@@ -837,10 +975,10 @@ The directory /proc/parport contains information about the parallel ports of
837your system. It has one subdirectory for each port, named after the port 975your system. It has one subdirectory for each port, named after the port
838number (0,1,2,...). 976number (0,1,2,...).
839 977
840These directories contain the four files shown in Table 1-8. 978These directories contain the four files shown in Table 1-10.
841 979
842 980
843Table 1-8: Files in /proc/parport 981Table 1-10: Files in /proc/parport
844.............................................................................. 982..............................................................................
845 File Content 983 File Content
846 autoprobe Any IEEE-1284 device ID information that has been acquired. 984 autoprobe Any IEEE-1284 device ID information that has been acquired.
@@ -858,10 +996,10 @@ Table 1-8: Files in /proc/parport
858 996
859Information about the available and actually used tty's can be found in the 997Information about the available and actually used tty's can be found in the
860directory /proc/tty.You'll find entries for drivers and line disciplines in 998directory /proc/tty.You'll find entries for drivers and line disciplines in
861this directory, as shown in Table 1-9. 999this directory, as shown in Table 1-11.
862 1000
863 1001
864Table 1-9: Files in /proc/tty 1002Table 1-11: Files in /proc/tty
865.............................................................................. 1003..............................................................................
866 File Content 1004 File Content
867 drivers list of drivers and their usage 1005 drivers list of drivers and their usage
@@ -952,9 +1090,9 @@ Information about mounted ext4 file systems can be found in
952/proc/fs/ext4. Each mounted filesystem will have a directory in 1090/proc/fs/ext4. Each mounted filesystem will have a directory in
953/proc/fs/ext4 based on its device name (i.e., /proc/fs/ext4/hdc or 1091/proc/fs/ext4 based on its device name (i.e., /proc/fs/ext4/hdc or
954/proc/fs/ext4/dm-0). The files in each per-device directory are shown 1092/proc/fs/ext4/dm-0). The files in each per-device directory are shown
955in Table 1-10, below. 1093in Table 1-12, below.
956 1094
957Table 1-10: Files in /proc/fs/ext4/<devname> 1095Table 1-12: Files in /proc/fs/ext4/<devname>
958.............................................................................. 1096..............................................................................
959 File Content 1097 File Content
960 mb_groups details of multiblock allocator buddy cache of free blocks 1098 mb_groups details of multiblock allocator buddy cache of free blocks