Lines Matching full:proc
4 The /proc Filesystem
8 /proc/sys Terrehon Bowden <terrehon@pacbell.net>, October 7 1999
11 move /proc/sys Shen Feng <shen@cn.fujitsu.com> April 1 2009
26 1.3 IDE devices in /proc/ide
27 1.4 Networking info in /proc/net
29 1.6 Parallel port info in /proc/parport
30 1.7 TTY info in /proc/tty
31 1.8 Miscellaneous kernel statistics in /proc/stat
37 3.1 /proc/<pid>/oom_adj & /proc/<pid>/oom_score_adj - Adjust the oom-killer
39 3.2 /proc/<pid>/oom_score - Display current oom-killer score
40 3.3 /proc/<pid>/io - Display the IO accounting fields
41 3.4 /proc/<pid>/coredump_filter - Core dump filtering settings
42 3.5 /proc/<pid>/mountinfo - Information about mounts
43 3.6 /proc/<pid>/comm & /proc/<pid>/task/<tid>/comm
44 3.7 /proc/<pid>/task/<tid>/children - Information about task children
45 3.8 /proc/<pid>/fdinfo/<fd> - Information about opened file
46 3.9 /proc/<pid>/map_files - Information about memory mapped files
47 3.10 /proc/<pid>/timerslack_ns - Task timerslack value
48 3.11 /proc/<pid>/patch_state - Livepatch patch operation state
49 3.12 /proc/<pid>/arch_status - Task architecture specific information
50 3.13 /proc/<pid>/fd - List of symlinks to open files
65 /proc file system and we've used many freely available sources to write these
69 we know, it is the first 'all-in-one' document about the /proc file system. It
88 https://www.kernel.org/doc/html/latest/filesystems/proc.html
106 * Investigating the properties of the pseudo file system /proc and its
108 * Examining /proc's structure
114 The proc file system acts as an interface to internal data structures in the
118 First, we'll take a look at the read-only parts of /proc. In Chapter 2, we
119 show you how you can use /proc/sys to change settings.
124 The directory /proc contains (among other things) one subdirectory for each
130 Note that an open file descriptor to /proc/<pid> or to any of its
133 open /proc/<pid> file descriptors corresponding to dead processes
138 .. table:: Table 1-1: Process specific entries in /proc
169 read the file /proc/PID/status::
171 >cat /proc/self/status
220 the ps command. In fact, ps uses the proc file system to obtain its
222 file /proc/PID/status. It fields are described in table 1-2.
233 snapshot of a moment, you can see /proc/<pid>/smaps file and scan page table.
369 use /proc/PID/wchan instead)
390 The /proc/PID/maps file contains the currently mapped memory regions and
446 Starting with 6.11 kernel, /proc/PID/maps provides an alternative
455 The /proc/PID/smaps is an extension based on maps, showing the memory
488 mapping in /proc/PID/maps. Following lines show the size of the mapping
595 Note: reading /proc/PID/maps or /proc/PID/smaps is inherently racy (consistent
607 The /proc/PID/smaps_rollup file includes the same fields as /proc/PID/smaps,
621 The /proc/PID/clear_refs is used to reset the PG_Referenced and ACCESSED/YOUNG
627 > echo 1 > /proc/PID/clear_refs
631 > echo 2 > /proc/PID/clear_refs
635 > echo 3 > /proc/PID/clear_refs
639 > echo 4 > /proc/PID/clear_refs
644 > echo 5 > /proc/PID/clear_refs
646 Any other value written to /proc/PID/clear_refs will have no effect.
648 The /proc/pid/pagemap gives the PFN, which can be used to find the pageflags
649 using /proc/kpageflags and number of times a page is mapped using
650 /proc/kpagecount. For detailed explanation, see
653 The /proc/pid/numa_maps is an extension based on maps, showing the memory
692 /proc and are listed in Table 1-5. Not all of these will be present in your
696 .. table:: Table 1-5: Kernel info in /proc
745 pci Deprecated info of PCI bus (new way -> /proc/bus/pci/,
763 they are used for by looking in the file /proc/interrupts::
765 > cat /proc/interrupts
784 > cat /proc/interrupts
813 In 2.6.2* /proc/interrupts was expanded again. This time the goal was for
814 /proc/interrupts to display every IRQ vector in use by the system, not
845 Of some interest is the introduction of the /proc/irq directory to 2.4.
853 > ls /proc/irq/
856 > ls /proc/irq/0/
862 > echo 1 > /proc/irq/10/smp_affinity
869 > cat /proc/irq/0/smp_affinity
875 > cat /proc/irq/0/smp_affinity_list
880 /proc/irq/[0-9]* directory.
895 There are three more important subdirectories in /proc: net, scsi, and sys.
908 > cat /proc/buddyinfo
927 > cat /proc/pagetypeinfo
981 > tail -n +3 /proc/allocinfo | sort -rn
1005 /proc/net/sockstat for TCP memory allocations.
1011 > cat /proc/meminfo
1257 > cat /proc/vmallocinfo
1290 > cat /proc/softirqs
1302 1.3 Networking info in /proc/net
1305 The subdirectory /proc/net follows the usual pattern. Table 1-8 shows the
1310 .. table:: Table 1-8: IPv6 info in /proc/net
1326 .. table:: Table 1-9: Network info in /proc/net
1363 > cat /proc/net/dev
1377 example, the bond0 device will have a directory called /proc/net/bond0/.
1386 subdirectory named after the driver for this adapter in /proc/scsi.
1387 You'll also see a list of all recognized SCSI devices in /proc/scsi::
1389 >cat /proc/scsi/scsi
1405 > cat /proc/scsi/aic7xxx/0
1445 1.5 Parallel port info in /proc/parport
1448 The directory /proc/parport contains information about the parallel ports of
1455 .. table:: Table 1-10: Files in /proc/parport
1470 1.6 TTY info in /proc/tty
1474 directory /proc/tty. You'll find entries for drivers and line disciplines in
1478 .. table:: Table 1-11: Files in /proc/tty
1489 /proc/tty/drivers::
1491 > cat /proc/tty/drivers
1505 1.7 Miscellaneous kernel statistics in /proc/stat
1509 /proc/stat file. All of the numbers reported in this file are aggregates
1512 > cat /proc/stat
1543 3. The value of iowait field in /proc/stat will decrease in certain
1546 So, the iowait is not reliable by reading from /proc/stat.
1584 /proc/fs/ext4. Each mounted filesystem will have a directory in
1585 /proc/fs/ext4 based on its device name (i.e., /proc/fs/ext4/hdc or
1586 /proc/fs/ext4/sda9 or /proc/fs/ext4/dm-0). The files in each per-device
1589 .. table:: Table 1-12: Files in /proc/fs/ext4/<devname>
1596 1.9 /proc/consoles
1601 /dev/console, you may simply look into the file /proc/consoles::
1603 > cat /proc/consoles
1630 The /proc file system serves information about the running system. It not only
1634 The directory structure of /proc reflects the types of information and makes
1643 * Modifying kernel parameters by writing into files found in /proc/sys
1645 * Review of the /proc/sys file tree
1649 A very interesting part of /proc is the directory /proc/sys. This is not only
1661 The files in /proc/sys can be used to fine tune and monitor miscellaneous and
1665 very careful when writing to any of these files. The entries in /proc may
1679 /proc/sys tree can not only be read, but also modified. You can use the echo
1687 3.1 /proc/<pid>/oom_adj & /proc/<pid>/oom_score_adj- Adjust the oom-killer score
1709 The value of /proc/<pid>/oom_score_adj is added to the badness score before it
1718 consider for each task. Setting a /proc/<pid>/oom_score_adj value of +500, for
1725 For backwards compatibility with previous kernels, /proc/<pid>/oom_adj may also
1729 scaled linearly with /proc/<pid>/oom_score_adj.
1731 The value of /proc/<pid>/oom_score_adj may be reduced no lower than the last
1736 3.2 /proc/<pid>/oom_score - Display current oom-killer score
1740 any given <pid>. Use it together with /proc/<pid>/oom_score_adj to tune which
1747 3.3 /proc/<pid>/io - Display the IO accounting fields
1760 test:/tmp # cat /proc/3828/io
1843 if process A reads process B's /proc/pid/io while process B is updating one
1850 3.4 /proc/<pid>/coredump_filter - Core dump filtering settings
1858 /proc/<pid>/coredump_filter allows you to customize which memory segments
1886 write 0x31 to the process's proc file::
1888 $ echo 0x31 > /proc/1234/coredump_filter
1894 $ echo 0x7 > /proc/self/coredump_filter
1897 3.5 /proc/<pid>/mountinfo - Information about mounts
1937 3.6 /proc/<pid>/comm & /proc/<pid>/task/<tid>/comm
1946 3.7 /proc/<pid>/task/<tid>/children - Information about task children
1953 not be listed here; one needs to read /proc/<children-pid>/task/<tid>/children
1963 3.8 /proc/<pid>/fdinfo/<fd> - Information about opened file
1971 /proc/<pid>/mountinfo for details]. 'ino' represents the inode number of
2120 3.9 /proc/<pid>/map_files - Information about memory mapped files
2136 files in a fast way instead of parsing /proc/<pid>/maps or
2137 /proc/<pid>/smaps, both of which contain many more records. At the same
2142 3.10 /proc/<pid>/timerslack_ns - Task timerslack value
2158 3.11 /proc/<pid>/patch_state - Livepatch patch operation state
2175 3.12 /proc/<pid>/arch_status - task architecture specific status
2185 $ cat /proc/6753/arch_status
2220 3.13 /proc/<pid>/fd - List of symlinks to open files
2232 of stat() output for /proc/<pid>/fd for fast access.
2245 hidepid= Set /proc/<pid>/ access mode.
2251 /proc/<pid>/ directories (default).
2253 hidepid=noaccess or hidepid=1 means users may not access any /proc/<pid>/
2257 behaviour). As an additional bonus, as /proc/<pid>/cmdline is unaccessible for
2261 hidepid=invisible or hidepid=2 means hidepid=1 plus all /proc/<pid>/ will be
2265 stat()'ing /proc/<pid>/ otherwise. It greatly complicates an intruder's task of
2271 /proc/<pid>/ directories that the caller can ptrace.
2290 # grep ^proc /proc/mounts
2291 proc /proc proc rw,relatime,hidepid=2 0 0
2293 # strace -e mount mount -o hidepid=1 -t proc proc /tmp/proc
2294 mount("proc", "/tmp/proc", "proc", 0, "hidepid=1") = 0
2297 # grep ^proc /proc/mounts
2298 proc /proc proc rw,relatime,hidepid=2 0 0
2299 proc /tmp/proc proc rw,relatime,hidepid=2 0 0
2304 # mount -o remount,hidepid=1 -t proc proc /tmp/proc
2306 # grep ^proc /proc/mounts
2307 proc /proc proc rw,relatime,hidepid=1 0 0
2308 proc /tmp/proc proc rw,relatime,hidepid=1 0 0
2317 # mount -o hidepid=invisible -t proc proc /proc
2318 # mount -o hidepid=noaccess -t proc proc /tmp/proc
2319 # grep ^proc /proc/mounts
2320 proc /proc proc rw,relatime,hidepid=invisible 0 0
2321 proc /tmp/proc proc rw,relatime,hidepid=noaccess 0 0