Lines Matching +full:embedded +full:- +full:trace +full:- +full:extension
1 .. SPDX-License-Identifier: GPL-2.0
24 1.1 Process-Specific Subdirectories
36 3 Per-Process Parameters
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
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.
62 ------------------------
70 we know, it is the first 'all-in-one' document about the /proc file system. It
73 It also only covers IPv4 networking, not IPv6 nor other protocols - sorry. But
92 mailing list at linux-[email protected] and/or try to reach me at
96 ---------------
106 ---------------
113 ------------------------------------------------------------------------------
119 First, we'll take a look at the read-only parts of /proc. In Chapter 2, we
122 1.1 Process-Specific Subdirectories
123 -----------------------------------
129 subdirectory has the entries listed in Table 1-1.
139 .. table:: Table 1-1: Process specific entries in /proc
158 symbol the task is blocked in - or "0" if not blocked.
160 stack Report full stack trace, enable via CONFIG_STACKTRACE
161 smaps An extension based on maps, showing the memory consumption of
165 numa_maps An extension based on maps, showing the memory locality and
223 file /proc/PID/status. It fields are described in table 1-2.
226 memory usage. Its seven fields are explained in Table 1-3. The stat file
228 explained in Table 1-4.
237 .. table:: Table 1-2: Contents of the status fields (as of 4.19)
311 .. table:: Table 1-3: Contents of the statm fields (as of 2.6.8-rc3)
329 .. table:: Table 1-4: Contents of the stat fields (as of 2.6.30-rc7)
398 08048000-08049000 r-xp 00000000 03:00 8312 /opt/test
399 08049000-0804a000 rw-p 00001000 03:00 8312 /opt/test
400 0804a000-0806b000 rw-p 00000000 00:00 0 [heap]
401 a7cb1000-a7cb2000 ---p 00000000 00:00 0
402 a7cb2000-a7eb2000 rw-p 00000000 00:00 0
403 a7eb2000-a7eb3000 ---p 00000000 00:00 0
404 a7eb3000-a7ed5000 rw-p 00000000 00:00 0
405 a7ed5000-a8008000 r-xp 00000000 03:00 4222 /lib/libc.so.6
406 a8008000-a800a000 r--p 00133000 03:00 4222 /lib/libc.so.6
407 a800a000-a800b000 rw-p 00135000 03:00 4222 /lib/libc.so.6
408 a800b000-a800e000 rw-p 00000000 00:00 0
409 a800e000-a8022000 r-xp 00000000 03:00 14462 /lib/libpthread.so.0
410 a8022000-a8023000 r--p 00013000 03:00 14462 /lib/libpthread.so.0
411 a8023000-a8024000 rw-p 00014000 03:00 14462 /lib/libpthread.so.0
412 a8024000-a8027000 rw-p 00000000 00:00 0
413 a8027000-a8043000 r-xp 00000000 03:00 8317 /lib/ld-linux.so.2
414 a8043000-a8044000 r--p 0001b000 03:00 8317 /lib/ld-linux.so.2
415 a8044000-a8045000 rw-p 0001c000 03:00 8317 /lib/ld-linux.so.2
416 aff35000-aff4a000 rw-p 00000000 00:00 0 [stack]
417 ffffe000-fffff000 r-xp 00000000 00:00 0 [vdso]
448 ioctl()-based API that gives ability to flexibly and efficiently query and
456 The /proc/PID/smaps is an extension based on maps, showing the memory
460 08048000-080bc000 r-xp 00000000 03:02 13130 /bin/bash
516 "KSM" reports how many of the pages are KSM pages. Note that KSM-placed zeropages
534 "Swap" shows how much would-be-anonymous memory is also used, but out on swap.
537 replaced by copy-on-write) part of the underlying shmem object out on swap.
583 uw userfaultfd wr-protect tracking
590 be vanished or the reverse -- new added. Interpretation of their meaning
613 - Pss_Anon
614 - Pss_File
615 - Pss_Shmem
625 soft-dirty bit on pte (see Documentation/admin-guide/mm/soft-dirty.rst
639 To clear the soft-dirty bit::
653 Documentation/admin-guide/mm/pagemap.rst.
655 The /proc/pid/numa_maps is an extension based on maps, showing the memory
664 3206000000 default file=/lib64/ld-2.12.so mapped=26 mapmax=6 N0=24 N3=2 kernelpagesize_kB=4
665 320621f000 default file=/lib64/ld-2.12.so anon=1 dirty=1 N3=1 kernelpagesize_kB=4
666 3206220000 default file=/lib64/ld-2.12.so anon=1 dirty=1 N3=1 kernelpagesize_kB=4
668 …3206800000 default file=/lib64/libc-2.12.so mapped=59 mapmax=21 active=55 N0=41 N3=18 kernelpagesi…
669 320698b000 default file=/lib64/libc-2.12.so
670 3206b8a000 default file=/lib64/libc-2.12.so anon=2 dirty=2 N3=2 kernelpagesize_kB=4
671 3206b8e000 default file=/lib64/libc-2.12.so anon=1 dirty=1 N3=1 kernelpagesize_kB=4
683 "policy" reports the NUMA memory policy set for the mapping (see Documentation/admin-guide/mm/numa_…
690 ---------------
694 /proc and are listed in Table 1-5. Not all of these will be present in your
698 .. table:: Table 1-5: Kernel info in /proc
712 cmdline Kernel command line, both from bootloader and embedded
747 pci Deprecated info of PCI bus (new way -> /proc/bus/pci/,
769 0: 8728810 XT-PIC timer
770 1: 895 XT-PIC keyboard
771 2: 0 XT-PIC cascade
772 3: 531695 XT-PIC aha152x
773 4: 2014133 XT-PIC serial
774 5: 44401 XT-PIC pcnet_cs
775 8: 2 XT-PIC rtc
776 11: 8 XT-PIC i82365
777 12: 182918 XT-PIC PS/2 Mouse
778 13: 1 XT-PIC fpu
779 14: 1232265 XT-PIC ide0
780 15: 7 XT-PIC ide1
789 0: 1243498 1214548 IO-APIC-edge timer
790 1: 8949 8958 IO-APIC-edge keyboard
791 2: 0 0 XT-PIC cascade
792 5: 11286 10161 IO-APIC-edge soundblaster
793 8: 1 0 IO-APIC-edge rtc
794 9: 27422 27407 IO-APIC-edge 3c503
795 12: 113645 113873 IO-APIC-edge PS/2 Mouse
796 13: 0 0 XT-PIC fpu
797 14: 22491 24012 IO-APIC-edge ide0
798 15: 2183 2415 IO-APIC-edge ide1
799 17: 30564 30414 IO-APIC-level eth0
800 18: 177 164 IO-APIC-level bttv
810 ERR is incremented in the case of errors in the IO-APIC bus (the bus that
812 the IO-APIC automatically retry the transmission, so it should not be a big
813 problem, but you should read the SMP-FAQ.
878 1024-1031
880 The default_smp_affinity mask applies to all non-active IRQs, which are the
882 /proc/irq/[0-9]* directory.
891 The way IRQs are routed is handled by the IO-APIC, and it's Round Robin
894 best choice for almost everyone. [Note this applies only to those IO-APIC's
952 X86-64. By keeping pages grouped based on their ability to move, the kernel
953 can reclaim pages within a page block to satisfy a high-order allocation.
957 by migrate-type and finishes with details on how many page blocks of each
983 > tail -n +3 /proc/allocinfo | sort -rn
988 13377536 234 block/blk-mq.c:3421 func:blk_mq_alloc_rqs
1091 In-memory cache for files read from the disk (the
1135 Non-file backed pages mapped into userspace page tables
1145 in-kernel data structures cache
1173 CommitLimit = ([total RAM pages] - [total huge TLB pages]) *
1181 in mm/overcommit-accounting.
1216 Non-file backed huge pages mapped into userspace page tables
1232 See Documentation/admin-guide/mm/hugetlbpage.rst.
1260 0xffffc20000000000-0xffffc20000201000 2101248 alloc_large_system_hash+0x204 ...
1262 0xffffc20000201000-0xffffc20000302000 1052672 alloc_large_system_hash+0x204 ...
1264 0xffffc20000302000-0xffffc20000304000 8192 acpi_tb_verify_table+0x21/0x4f...
1266 0xffffc20000304000-0xffffc20000307000 12288 acpi_tb_verify_table+0x21/0x4f...
1268 0xffffc2000031d000-0xffffc2000031f000 8192 init_vdso_vars+0x112/0x210
1269 0xffffc2000031f000-0xffffc2000032b000 49152 cramfs_uncompress_init+0x2e ...
1271 0xffffc2000033a000-0xffffc2000033d000 12288 sys_swapon+0x640/0xac0 ...
1273 0xffffc20000347000-0xffffc2000034c000 20480 xt_alloc_table_info+0xfe ...
1275 0xffffffffa0000000-0xffffffffa000f000 61440 sys_init_module+0xc27/0x1d00 ...
1277 0xffffffffa000f000-0xffffffffa0014000 20480 sys_init_module+0xc27/0x1d00 ...
1279 0xffffffffa0014000-0xffffffffa0017000 12288 sys_init_module+0xc27/0x1d00 ...
1281 0xffffffffa0017000-0xffffffffa0022000 45056 sys_init_module+0xc27/0x1d00 ...
1305 --------------------------------
1307 The subdirectory /proc/net follows the usual pattern. Table 1-8 shows the
1309 support this. Table 1-9 lists the files and their meaning.
1312 .. table:: Table 1-8: IPv6 info in /proc/net
1328 .. table:: Table 1-9: Network info in /proc/net
1350 softnet_stat Per-CPU incoming packets queues statistics of online CPUs
1366 Inter-|Receive |[...
1385 -------------
1395 Type: Direct-Access ANSI SCSI revision: 03
1397 Vendor: PIONEER Model: CD-ROM DR-U06S Rev: 1.04
1398 Type: CD-ROM ANSI SCSI revision: 02
1405 AHA-2940 SCSI adapter::
1415 SCSI Adapter: Adaptec AHA-294X Ultra SCSI host adapter
1448 ---------------------------------------
1454 These directories contain the four files shown in Table 1-10.
1457 .. table:: Table 1-10: Files in /proc/parport
1462 autoprobe Any IEEE-1284 device ID information that has been acquired.
1473 -------------------------
1477 this directory, as shown in Table 1-11.
1480 .. table:: Table 1-11: Files in /proc/tty
1494 pty_slave /dev/pts 136 0-255 pty:slave
1495 pty_master /dev/ptm 128 0-255 pty:master
1496 pty_slave /dev/ttyp 3 0-255 pty:slave
1497 pty_master /dev/pty 2 0-255 pty:master
1498 serial /dev/cua 5 64-67 serial:callout
1499 serial /dev/ttyS 4 64-67 serial
1504 unknown /dev/tty 4 1-63 console
1508 -------------------------------------------------
1533 - user: normal processes executing in user mode
1534 - nice: niced processes executing in user mode
1535 - system: processes executing in kernel mode
1536 - idle: twiddling thumbs
1537 - iowait: In a word, iowait stands for waiting for I/O to complete. But there
1543 2. In a multi-core CPU, the task waiting for I/O to complete is not running
1549 - irq: servicing interrupts
1550 - softirq: servicing softirqs
1551 - steal: involuntary wait
1552 - guest: running a normal guest
1553 - guest_nice: running a niced guest
1583 -------------------------------
1588 /proc/fs/ext4/sda9 or /proc/fs/ext4/dm-0). The files in each per-device
1589 directory are shown in Table 1-12, below.
1591 .. table:: Table 1-12: Files in /proc/fs/ext4/<devname>
1599 -------------------
1606 tty0 -WU (ECp) 4:7
1607 ttyS0 -W- (Ep) 4:64
1611 +--------------------+-------------------------------------------------------+
1617 +--------------------+-------------------------------------------------------+
1624 +--------------------+-------------------------------------------------------+
1627 +--------------------+-------------------------------------------------------+
1630 -------
1643 ---------------
1649 ------------------------------------------------------------------------------
1673 Please see: Documentation/admin-guide/sysctl/ directory for descriptions of
1677 -------
1686 Chapter 3: Per-process Parameters
1689 3.1 /proc/<pid>/oom_adj & /proc/<pid>/oom_score_adj- Adjust the oom-killer score
1690 --------------------------------------------------------------------------------
1712 is used to determine which task to kill. Acceptable values range from -1000
1715 task or completely disabling it. The lowest possible value, -1000, is
1723 50% more memory. A value of -500, on the other hand, would be roughly
1728 be used to tune the badness score. Its acceptable values range from -16
1729 (OOM_ADJUST_MIN) to +15 (OOM_ADJUST_MAX) and a special value of -17
1738 3.2 /proc/<pid>/oom_score - Display current oom-killer score
1739 -------------------------------------------------------------
1741 This file can be used to check the current score used by the oom-killer for
1743 process should be killed in an out-of-memory situation.
1749 3.3 /proc/<pid>/io - Display the IO accounting fields
1750 -------------------------------------------------------
1816 accurate for block-backed filesystems. <please add status regarding NFS and
1825 the storage layer. This is done at page-dirtying time.
1844 At its current implementation state, this is a bit racy on 32-bit machines:
1846 of those 64-bit counters, process A could see an intermediate result.
1852 3.4 /proc/<pid>/coredump_filter - Core dump filtering settings
1853 ---------------------------------------------------------------
1857 Conversely, sometimes we want to save file-backed memory segments into a core
1867 - (bit 0) anonymous private memory
1868 - (bit 1) anonymous shared memory
1869 - (bit 2) file-backed private memory
1870 - (bit 3) file-backed shared memory
1871 - (bit 4) ELF header pages in file-backed private memory areas (it is
1873 - (bit 5) hugetlb private memory
1874 - (bit 6) hugetlb shared memory
1875 - (bit 7) DAX private memory
1876 - (bit 8) DAX shared memory
1881 Note that bits 0-4 don't affect hugetlb or DAX memory. hugetlb memory is
1882 only affected by bit 5-6, and DAX is only affected by bits 7-8.
1899 3.5 /proc/<pid>/mountinfo - Information about mounts
1900 --------------------------------------------------------
1904 36 35 98:0 /mnt1 /mnt2 rw,noatime master:1 - ext3 /dev/root rw,errors=continue
1940 --------------------------------------------------------
1948 3.7 /proc/<pid>/task/<tid>/children - Information about task children
1949 -------------------------------------------------------------------------
1954 Note the "first level" here -- if a child has its own children they will
1955 not be listed here; one needs to read /proc/<children-pid>/task/<tid>/children
1965 3.8 /proc/<pid>/fdinfo/<fd> - Information about opened file
1966 ---------------------------------------------------------------
1968 files have at least four fields -- 'pos', 'flags', 'mnt_id' and 'ino'.
1999 eventfd-count: 5a
2001 where 'eventfd-count' is hex value of a counter.
2044 …inotify wd:3 ino:9e7e sdev:800013 mask:800afce ignored_mask:0 fhandle-bytes:8 fhandle-type:1 f_han…
2053 fields 'fhandle-bytes', 'fhandle-type' and 'f_handle', all in hex
2067 fanotify flags:10 event-flags:0
2069 …fanotify ino:4f969 sdev:800013 mflags:0 mask:3b ignored_mask:40000000 fhandle-bytes:8 fhandle-type…
2071 where fanotify 'flags' and 'event-flags' are values used in fanotify_init
2117 exp_name: system-heap
2122 3.9 /proc/<pid>/map_files - Information about memory mapped files
2123 ---------------------------------------------------------------------
2127 | lr-------- 1 root root 64 Jan 27 11:24 333c600000-333c620000 -> /usr/lib64/ld-2.18.so
2128 | lr-------- 1 root root 64 Jan 27 11:24 333c81f000-333c820000 -> /usr/lib64/ld-2.18.so
2129 | lr-------- 1 root root 64 Jan 27 11:24 333c820000-333c821000 -> /usr/lib64/ld-2.18.so
2131 | lr-------- 1 root root 64 Jan 27 11:24 35d0421000-35d0422000 -> /usr/lib64/libselinux.so.1
2132 | lr-------- 1 root root 64 Jan 27 11:24 400000-41a000 -> /usr/bin/ls
2135 vm_area_struct::vm_start-vm_area_struct::vm_end.
2144 3.10 /proc/<pid>/timerslack_ns - Task timerslack value
2145 ---------------------------------------------------------
2155 Valid values are from 0 - ULLONG_MAX
2160 3.11 /proc/<pid>/patch_state - Livepatch patch operation state
2161 -----------------------------------------------------------------
2165 A value of '-1' indicates that no patch is in transition.
2177 3.12 /proc/<pid>/arch_status - task architecture specific status
2178 -------------------------------------------------------------------
2218 A special value of '-1' indicates that no AVX512 usage was recorded, thus
2222 3.13 /proc/<pid>/fd - List of symlinks to open files
2223 -------------------------------------------------------
2227 lr-x------ 1 root root 64 Sep 20 17:53 0 -> /dev/null
2228 l-wx------ 1 root root 64 Sep 20 17:53 1 -> /dev/null
2229 lrwx------ 1 root root 64 Sep 20 17:53 10 -> 'socket:[12539]'
2230 lrwx------ 1 root root 64 Sep 20 17:53 11 -> 'socket:[12540]'
2231 lrwx------ 1 root root 64 Sep 20 17:53 12 -> 'socket:[12542]'
2235 -------------------------------------------------------
2237 3.14 /proc/<pid/ksm_stat - Information about the process's ksm status
2238 ---------------------------------------------------------------------
2263 addresses. KSM will generate a ksm_rmap_item for each ksm-scanned page of
2303 Documentation/admin-guide/mm/ksm.rst.
2310 ---------------------
2320 hidepid=off or hidepid=0 means classic mode - everybody may access all
2334 by "kill -0 $PID"), but it hides process's uid and gid, which may be learned by
2363 # strace -e mount mount -o hidepid=1 -t proc proc /tmp/proc
2374 # mount -o remount,hidepid=1 -t proc proc /tmp/proc
2387 # mount -o hidepid=invisible -t proc proc /proc
2388 # mount -o hidepid=noaccess -t proc proc /tmp/proc