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| author | Hugh Dickins <hughd@google.com> | 2016-07-28 15:48:41 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-28 16:07:41 -0700 |
| commit | 1d2047fefa20e49072f6a37a7f71544e8cace529 (patch) | |
| tree | 0da9cd7348ee67586ea430e09190be88970923c3 /mm/mempool.c | |
| parent | 7c7fd82556c61113b6327c9696b347a82b215072 (diff) | |
| download | linux-1d2047fefa20e49072f6a37a7f71544e8cace529.tar.gz linux-1d2047fefa20e49072f6a37a7f71544e8cace529.tar.bz2 linux-1d2047fefa20e49072f6a37a7f71544e8cace529.zip | |
mm, compaction: don't isolate PageWriteback pages in MIGRATE_SYNC_LIGHT mode
At present MIGRATE_SYNC_LIGHT is allowing __isolate_lru_page() to
isolate a PageWriteback page, which __unmap_and_move() then rejects with
-EBUSY: of course the writeback might complete in between, but that's
not what we usually expect, so probably better not to isolate it.
When tested by stress-highalloc from mmtests, this has reduced the
number of page migrate failures by 60-70%.
Link: http://lkml.kernel.org/r/20160721073614.24395-2-vbabka@suse.cz
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mempool.c')
0 files changed, 0 insertions, 0 deletions