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    Subject[PATCH 4.14 081/109] mm: treat indirectly reclaimable memory as available in MemAvailable
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Roman Gushchin <guro@fb.com>

    commit 034ebf65c3c21d85b963d39f992258a64a85e3a9 upstream.

    Adjust /proc/meminfo MemAvailable calculation by adding the amount of
    indirectly reclaimable memory (rounded to the PAGE_SIZE).

    Link: http://lkml.kernel.org/r/20180305133743.12746-4-guro@fb.com
    Signed-off-by: Roman Gushchin <guro@fb.com>
    Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
    Cc: Alexander Viro <viro@zeniv.linux.org.uk>
    Cc: Michal Hocko <mhocko@suse.com>
    Cc: Johannes Weiner <hannes@cmpxchg.org>
    Cc: Mel Gorman <mgorman@techsingularity.net>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    mm/page_alloc.c | 7 +++++++
    1 file changed, 7 insertions(+)

    --- a/mm/page_alloc.c
    +++ b/mm/page_alloc.c
    @@ -4557,6 +4557,13 @@ long si_mem_available(void)
    min(global_node_page_state(NR_SLAB_RECLAIMABLE) / 2,
    wmark_low);

    + /*
    + * Part of the kernel memory, which can be released under memory
    + * pressure.
    + */
    + available += global_node_page_state(NR_INDIRECTLY_RECLAIMABLE_BYTES) >>
    + PAGE_SHIFT;
    +
    if (available < 0)
    available = 0;
    return available;

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