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authorVladimir Davydov <vdavydov@virtuozzo.com>2016-01-20 23:03:10 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-21 01:09:18 (GMT)
commit5ccc5abaaf6f9242cc63342c5286990233f392fa (patch)
tree14406eb21280bafa4a447d4b45ea5bd6caa354af /mm/swapfile.c
parentd8b38438a0bcb362c396f49d8279ef7b505917f4 (diff)
downloadlinux-5ccc5abaaf6f9242cc63342c5286990233f392fa.tar.xz
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>
Diffstat (limited to 'mm/swapfile.c')
-rw-r--r--mm/swapfile.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 22a7a1f..c43f654 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1006,7 +1006,7 @@ int free_swap_and_cache(swp_entry_t entry)
* Also recheck PageSwapCache now page is locked (above).
*/
if (PageSwapCache(page) && !PageWriteback(page) &&
- (!page_mapped(page) || vm_swap_full())) {
+ (!page_mapped(page) || mem_cgroup_swap_full(page))) {
delete_from_swap_cache(page);
SetPageDirty(page);
}