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| author | Mike Rapoport <rppt@linux.ibm.com> | 2021-07-01 04:50:00 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-07-01 06:47:28 +0300 |
| commit | 8d719afcb34434ebfa7911338d8c777eca8452b0 (patch) | |
| tree | 6e71c677883e6cb656acf02bddec12868834da4b /Documentation | |
| parent | 781eb2cdd26f3748be57da9bed98bbe5b0dd99fb (diff) | |
| download | linux-8d719afcb34434ebfa7911338d8c777eca8452b0.tar.xz | |
docs: proc.rst: meminfo: briefly describe gaps in memory accounting
Add a paragraph that explains that it may happen that the counters in
/proc/meminfo do not add up to the overall memory usage.
Link: https://lkml.kernel.org/r/20210421061127.1182723-1-rppt@kernel.org
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Eric Dumazet <eric.dumazet@gmail.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.rst | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst index 81bfe3c800cc..dd4e3e18c22b 100644 --- a/Documentation/filesystems/proc.rst +++ b/Documentation/filesystems/proc.rst @@ -933,8 +933,15 @@ meminfo ~~~~~~~ Provides information about distribution and utilization of memory. This -varies by architecture and compile options. The following is from a -16GB PIII, which has highmem enabled. You may not have all of these fields. +varies by architecture and compile options. Some of the counters reported +here overlap. The memory reported by the non overlapping counters may not +add up to the overall memory usage and the difference for some workloads +can be substantial. In many cases there are other means to find out +additional memory using subsystem specific interfaces, for instance +/proc/net/sockstat for TCP memory allocations. + +The following is from a 16GB PIII, which has highmem enabled. +You may not have all of these fields. :: |