mm: free swap cache aggressively if memcg swap is full
authorVladimir Davydov <vdavydov@virtuozzo.com>
Wed, 20 Jan 2016 23:03:10 +0000 (15:03 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 21 Jan 2016 01:09:18 +0000 (17:09 -0800)
commit5ccc5abaaf6f9242cc63342c5286990233f392fa
tree14406eb21280bafa4a447d4b45ea5bd6caa354af
parentd8b38438a0bcb362c396f49d8279ef7b505917f4
mm: free swap cache aggressively if memcg swap is full

Swap cache pages are freed aggressively if swap is nearly full (>50%
currently), because otherwise we are likely to stop scanning anonymous
when we near the swap limit even if there is plenty of freeable swap cache
pages.  We should follow the same trend in case of memory cgroup, which
has its own swap limit.

Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/swap.h
mm/memcontrol.c
mm/memory.c
mm/swapfile.c
mm/vmscan.c