Lines Matching refs: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
51 3.14 /proc/<pid/ksm_stat - Information about the process's ksm status.
72 https://www.kernel.org/doc/html/latest/filesystems/proc.html
86 * Investigating the properties of the pseudo file system /proc and its
88 * Examining /proc's structure
94 The proc file system acts as an interface to internal data structures in the
98 First, we'll take a look at the read-only parts of /proc. In Chapter 2, we
99 show you how you can use /proc/sys to change settings.
104 The directory /proc contains (among other things) one subdirectory for each
110 A process can read its own information from /proc/PID/* with no extra
111 permissions. When reading /proc/PID/* information for other processes, reading
118 to /proc/PID/mem for other processes.
120 Note that an open file descriptor to /proc/<pid> or to any of its
123 open /proc/<pid> file descriptors corresponding to dead processes
128 .. table:: Table 1-1: Process specific entries in /proc
159 read the file /proc/PID/status::
161 >cat /proc/self/status
210 the ps command. In fact, ps uses the proc file system to obtain its
212 file /proc/PID/status. It fields are described in table 1-2.
223 snapshot of a moment, you can see /proc/<pid>/smaps file and scan page table.
360 use /proc/PID/wchan instead)
381 The /proc/PID/maps file contains the currently mapped memory regions and
437 Starting with 6.11 kernel, /proc/PID/maps provides an alternative
446 The /proc/PID/smaps is an extension based on maps, showing the memory
479 the mapping in /proc/PID/maps. Following lines show the size of the
606 Note: reading /proc/PID/maps or /proc/PID/smaps is inherently racy (consistent
618 The /proc/PID/smaps_rollup file includes the same fields as /proc/PID/smaps,
632 The /proc/PID/clear_refs is used to reset the PG_Referenced and ACCESSED/YOUNG
638 > echo 1 > /proc/PID/clear_refs
642 > echo 2 > /proc/PID/clear_refs
646 > echo 3 > /proc/PID/clear_refs
650 > echo 4 > /proc/PID/clear_refs
655 > echo 5 > /proc/PID/clear_refs
657 Any other value written to /proc/PID/clear_refs will have no effect.
659 The /proc/pid/pagemap gives the PFN, which can be used to find the pageflags
660 using /proc/kpageflags and number of times a page is mapped using
661 /proc/kpagecount. For detailed explanation, see
664 The /proc/pid/numa_maps is an extension based on maps, showing the memory
708 /proc and are listed in Table 1-5. Not all of these will be present in your
712 .. table:: Table 1-5: Kernel info in /proc
761 pci Deprecated info of PCI bus (new way -> /proc/bus/pci/,
779 they are used for by looking in the file /proc/interrupts::
781 > cat /proc/interrupts
800 > cat /proc/interrupts
829 In 2.6.2* /proc/interrupts was expanded again. This time the goal was for
830 /proc/interrupts to display every IRQ vector in use by the system, not
861 Of some interest is the introduction of the /proc/irq directory to 2.4.
869 > ls /proc/irq/
872 > ls /proc/irq/0/
878 > echo 1 > /proc/irq/10/smp_affinity
885 > cat /proc/irq/0/smp_affinity
891 > cat /proc/irq/0/smp_affinity_list
896 /proc/irq/[0-9]* directory.
911 There are three more important subdirectories in /proc: net, scsi, and sys.
924 > cat /proc/buddyinfo
943 > cat /proc/pagetypeinfo
1010 > tail -n +3 /proc/allocinfo | sort -rn
1034 /proc/net/sockstat for TCP memory allocations.
1040 > cat /proc/meminfo
1300 > cat /proc/vmallocinfo
1333 > cat /proc/softirqs
1345 1.3 Networking info in /proc/net
1348 The subdirectory /proc/net follows the usual pattern. Table 1-8 shows the
1353 .. table:: Table 1-8: IPv6 info in /proc/net
1369 .. table:: Table 1-9: Network info in /proc/net
1406 > cat /proc/net/dev
1420 example, the bond0 device will have a directory called /proc/net/bond0/.
1429 subdirectory named after the driver for this adapter in /proc/scsi.
1430 You'll also see a list of all recognized SCSI devices in /proc/scsi::
1432 >cat /proc/scsi/scsi
1448 > cat /proc/scsi/aic7xxx/0
1488 1.5 Parallel port info in /proc/parport
1491 The directory /proc/parport contains information about the parallel ports of
1498 .. table:: Table 1-10: Files in /proc/parport
1513 1.6 TTY info in /proc/tty
1517 directory /proc/tty. You'll find entries for drivers and line disciplines in
1521 .. table:: Table 1-11: Files in /proc/tty
1532 /proc/tty/drivers::
1534 > cat /proc/tty/drivers
1548 1.7 Miscellaneous kernel statistics in /proc/stat
1552 /proc/stat file. All of the numbers reported in this file are aggregates
1555 > cat /proc/stat
1586 3. The value of iowait field in /proc/stat will decrease in certain
1589 So, the iowait is not reliable by reading from /proc/stat.
1627 /proc/fs/ext4. Each mounted filesystem will have a directory in
1628 /proc/fs/ext4 based on its device name (i.e., /proc/fs/ext4/hdc or
1629 /proc/fs/ext4/sda9 or /proc/fs/ext4/dm-0). The files in each per-device
1632 .. table:: Table 1-12: Files in /proc/fs/ext4/<devname>
1639 1.9 /proc/consoles
1644 /dev/console, you may simply look into the file /proc/consoles::
1646 > cat /proc/consoles
1673 The /proc file system serves information about the running system. It not only
1677 The directory structure of /proc reflects the types of information and makes
1686 * Modifying kernel parameters by writing into files found in /proc/sys
1688 * Review of the /proc/sys file tree
1692 A very interesting part of /proc is the directory /proc/sys. This is not only
1704 The files in /proc/sys can be used to fine tune and monitor miscellaneous and
1708 very careful when writing to any of these files. The entries in /proc may
1722 /proc/sys tree can not only be read, but also modified. You can use the echo
1730 3.1 /proc/<pid>/oom_adj & /proc/<pid>/oom_score_adj- Adjust the oom-killer score
1752 The value of /proc/<pid>/oom_score_adj is added to the badness score before it
1761 consider for each task. Setting a /proc/<pid>/oom_score_adj value of +500, for
1768 For backwards compatibility with previous kernels, /proc/<pid>/oom_adj may also
1772 scaled linearly with /proc/<pid>/oom_score_adj.
1774 The value of /proc/<pid>/oom_score_adj may be reduced no lower than the last
1779 3.2 /proc/<pid>/oom_score - Display current oom-killer score
1783 any given <pid>. Use it together with /proc/<pid>/oom_score_adj to tune which
1790 3.3 /proc/<pid>/io - Display the IO accounting fields
1803 test:/tmp # cat /proc/3828/io
1886 if process A reads process B's /proc/pid/io while process B is updating one
1893 3.4 /proc/<pid>/coredump_filter - Core dump filtering settings
1901 /proc/<pid>/coredump_filter allows you to customize which memory segments
1929 write 0x31 to the process's proc file::
1931 $ echo 0x31 > /proc/1234/coredump_filter
1937 $ echo 0x7 > /proc/self/coredump_filter
1940 3.5 /proc/<pid>/mountinfo - Information about mounts
1980 3.6 /proc/<pid>/comm & /proc/<pid>/task/<tid>/comm
1989 3.7 /proc/<pid>/task/<tid>/children - Information about task children
1996 not be listed here; one needs to read /proc/<children-pid>/task/<tid>/children
2006 3.8 /proc/<pid>/fdinfo/<fd> - Information about opened file
2014 /proc/<pid>/mountinfo for details]. 'ino' represents the inode number of
2177 3.9 /proc/<pid>/map_files - Information about memory mapped files
2193 files in a fast way instead of parsing /proc/<pid>/maps or
2194 /proc/<pid>/smaps, both of which contain many more records. At the same
2199 3.10 /proc/<pid>/timerslack_ns - Task timerslack value
2215 3.11 /proc/<pid>/patch_state - Livepatch patch operation state
2232 3.12 /proc/<pid>/arch_status - task architecture specific status
2242 $ cat /proc/6753/arch_status
2277 3.13 /proc/<pid>/fd - List of symlinks to open files
2289 of stat() output for /proc/<pid>/fd for fast access.
2292 3.14 /proc/<pid/ksm_stat - Information about the process's ksm status
2302 / # cat /proc/self/ksm_stat
2332 /proc/<pid>/ksm_merging_pages shows.
2370 hidepid= Set /proc/<pid>/ access mode.
2377 /proc/<pid>/ directories (default).
2379 hidepid=noaccess or hidepid=1 means users may not access any /proc/<pid>/
2383 behaviour). As an additional bonus, as /proc/<pid>/cmdline is unaccessible for
2387 hidepid=invisible or hidepid=2 means hidepid=1 plus all /proc/<pid>/ will be
2391 stat()'ing /proc/<pid>/ otherwise. It greatly complicates an intruder's task of
2397 /proc/<pid>/ directories that the caller can ptrace.
2407 `/proc/$pid/ns/pid`, or a file descriptor when using `FSCONFIG_SET_FD`) that
2423 # grep ^proc /proc/mounts
2424 proc /proc proc rw,relatime,hidepid=2 0 0
2426 # strace -e mount mount -o hidepid=1 -t proc proc /tmp/proc
2427 mount("proc", "/tmp/proc", "proc", 0, "hidepid=1") = 0
2430 # grep ^proc /proc/mounts
2431 proc /proc proc rw,relatime,hidepid=2 0 0
2432 proc /tmp/proc proc rw,relatime,hidepid=2 0 0
2437 # mount -o remount,hidepid=1 -t proc proc /tmp/proc
2439 # grep ^proc /proc/mounts
2440 proc /proc proc rw,relatime,hidepid=1 0 0
2441 proc /tmp/proc proc rw,relatime,hidepid=1 0 0
2450 # mount -o hidepid=invisible -t proc proc /proc
2451 # mount -o hidepid=noaccess -t proc proc /tmp/proc
2452 # grep ^proc /proc/mounts
2453 proc /proc proc rw,relatime,hidepid=invisible 0 0
2454 proc /tmp/proc proc rw,relatime,hidepid=noaccess 0 0