• Michal Hocko's avatar
    mm, compaction: distinguish between full and partial COMPACT_COMPLETE · c8f7de0b
    Michal Hocko authored
    COMPACT_COMPLETE now means that compaction and free scanner met.  This
    is not very useful information if somebody just wants to use this
    feedback and make any decisions based on that.  The current caller might
    be a poor guy who just happened to scan tiny portion of the zone and
    that could be the reason no suitable pages were compacted.  Make sure we
    distinguish the full and partial zone walks.
    
    Consumers should treat COMPACT_PARTIAL_SKIPPED as a potential success
    and be optimistic in retrying.
    
    The existing users of COMPACT_COMPLETE are conservatively changed to use
    COMPACT_PARTIAL_SKIPPED as well but some of them should be probably
    reconsidered and only defer the compaction only for COMPACT_COMPLETE
    with the new semantic.
    
    This patch shouldn't introduce any functional changes.
    Signed-off-by: default avatarMichal Hocko <mhocko@suse.com>
    Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
    Acked-by: default avatarHillf Danton <hillf.zj@alibaba-inc.com>
    Cc: David Rientjes <rientjes@google.com>
    Cc: Johannes Weiner <hannes@cmpxchg.org>
    Cc: Joonsoo Kim <js1304@gmail.com>
    Cc: Mel Gorman <mgorman@techsingularity.net>
    Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
    Cc: Vladimir Davydov <vdavydov@virtuozzo.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    c8f7de0b
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