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authorLinus Torvalds <torvalds@linux-foundation.org>2015-02-13 05:54:28 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-13 05:54:28 +0300
commit818099574b04c5301eacbbcd441022b353a65466 (patch)
tree77b3645b375105cb0389df2b4ea5ffa90329f7f8 /Documentation
parent802ea9d8645d33d24b7b4cd4537c14f3e698bde0 (diff)
parent6016daed58ee482a2f7684e93342e89139cf4419 (diff)
downloadlinux-818099574b04c5301eacbbcd441022b353a65466.tar.xz
Merge branch 'akpm' (patches from Andrew)
Merge third set of updates from Andrew Morton: - the rest of MM [ This includes getting rid of the numa hinting bits, in favor of just generic protnone logic. Yay. - Linus ] - core kernel - procfs - some of lib/ (lots of lib/ material this time) * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (104 commits) lib/lcm.c: replace include lib/percpu_ida.c: remove redundant includes lib/strncpy_from_user.c: replace module.h include lib/stmp_device.c: replace module.h include lib/sort.c: move include inside #if 0 lib/show_mem.c: remove redundant include lib/radix-tree.c: change to simpler include lib/plist.c: remove redundant include lib/nlattr.c: remove redundant include lib/kobject_uevent.c: remove redundant include lib/llist.c: remove redundant include lib/md5.c: simplify include lib/list_sort.c: rearrange includes lib/genalloc.c: remove redundant include lib/idr.c: remove redundant include lib/halfmd4.c: simplify includes lib/dynamic_queue_limits.c: simplify includes lib/sort.c: use simpler includes lib/interval_tree.c: simplify includes hexdump: make it return number of bytes placed in buffer ...
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/filesystems/proc.txt37
1 files changed, 37 insertions, 0 deletions
diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index cf8fc2f0b34b..a07ba61662ed 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -145,6 +145,8 @@ Table 1-1: Process specific entries in /proc
stack Report full stack trace, enable via CONFIG_STACKTRACE
smaps a extension based on maps, showing the memory consumption of
each mapping and flags associated with it
+ numa_maps an extension based on maps, showing the memory locality and
+ binding policy as well as mem usage (in pages) of each mapping.
..............................................................................
For example, to get the status information of a process, all you have to do is
@@ -489,12 +491,47 @@ To clear the bits for the file mapped pages associated with the process
To clear the soft-dirty bit
> echo 4 > /proc/PID/clear_refs
+To reset the peak resident set size ("high water mark") to the process's
+current value:
+ > echo 5 > /proc/PID/clear_refs
+
Any other value written to /proc/PID/clear_refs will have no effect.
The /proc/pid/pagemap gives the PFN, which can be used to find the pageflags
using /proc/kpageflags and number of times a page is mapped using
/proc/kpagecount. For detailed explanation, see Documentation/vm/pagemap.txt.
+The /proc/pid/numa_maps is an extension based on maps, showing the memory
+locality and binding policy, as well as the memory usage (in pages) of
+each mapping. The output follows a general format where mapping details get
+summarized separated by blank spaces, one mapping per each file line:
+
+address policy mapping details
+
+00400000 default file=/usr/local/bin/app mapped=1 active=0 N3=1 kernelpagesize_kB=4
+00600000 default file=/usr/local/bin/app anon=1 dirty=1 N3=1 kernelpagesize_kB=4
+3206000000 default file=/lib64/ld-2.12.so mapped=26 mapmax=6 N0=24 N3=2 kernelpagesize_kB=4
+320621f000 default file=/lib64/ld-2.12.so anon=1 dirty=1 N3=1 kernelpagesize_kB=4
+3206220000 default file=/lib64/ld-2.12.so anon=1 dirty=1 N3=1 kernelpagesize_kB=4
+3206221000 default anon=1 dirty=1 N3=1 kernelpagesize_kB=4
+3206800000 default file=/lib64/libc-2.12.so mapped=59 mapmax=21 active=55 N0=41 N3=18 kernelpagesize_kB=4
+320698b000 default file=/lib64/libc-2.12.so
+3206b8a000 default file=/lib64/libc-2.12.so anon=2 dirty=2 N3=2 kernelpagesize_kB=4
+3206b8e000 default file=/lib64/libc-2.12.so anon=1 dirty=1 N3=1 kernelpagesize_kB=4
+3206b8f000 default anon=3 dirty=3 active=1 N3=3 kernelpagesize_kB=4
+7f4dc10a2000 default anon=3 dirty=3 N3=3 kernelpagesize_kB=4
+7f4dc10b4000 default anon=2 dirty=2 active=1 N3=2 kernelpagesize_kB=4
+7f4dc1200000 default file=/anon_hugepage\040(deleted) huge anon=1 dirty=1 N3=1 kernelpagesize_kB=2048
+7fff335f0000 default stack anon=3 dirty=3 N3=3 kernelpagesize_kB=4
+7fff3369d000 default mapped=1 mapmax=35 active=0 N3=1 kernelpagesize_kB=4
+
+Where:
+"address" is the starting address for the mapping;
+"policy" reports the NUMA memory policy set for the mapping (see vm/numa_memory_policy.txt);
+"mapping details" summarizes mapping data such as mapping type, page usage counters,
+node locality page counters (N0 == node0, N1 == node1, ...) and the kernel page
+size, in KB, that is backing the mapping up.
+
1.2 Kernel data
---------------