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    Subject[PATCH v5 1/6] mm, documentation: clarify /proc/pid/status VmSwap limitations for shmem
    Date
    The documentation for /proc/pid/status does not mention that the value of
    VmSwap counts only swapped out anonymous private pages, and not swapped out
    pages of the underlying shmem objects (for shmem mappings). This is not
    obvious, so document this limitation.

    Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
    Acked-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
    Acked-by: Michal Hocko <mhocko@suse.com>
    Acked-by: Jerome Marchand <jmarchan@redhat.com>
    Acked-by: Hugh Dickins <hughd@google.com>
    ---
    Documentation/filesystems/proc.txt | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
    index 402ab99..9f13b6e 100644
    --- a/Documentation/filesystems/proc.txt
    +++ b/Documentation/filesystems/proc.txt
    @@ -238,7 +238,8 @@ Table 1-2: Contents of the status files (as of 4.1)
    VmLib size of shared library code
    VmPTE size of page table entries
    VmPMD size of second level page tables
    - VmSwap size of swap usage (the number of referred swapents)
    + VmSwap amount of swap used by anonymous private data
    + (shmem swap usage is not included)
    HugetlbPages size of hugetlb memory portions
    Threads number of threads
    SigQ number of signals queued/max. number for queue
    --
    2.6.3


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