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authorZi Yan <ziy@nvidia.com>2020-11-13 22:51:43 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-11-14 11:26:03 -0800
commitd20bdd571ee5c9966191568527ecdb1bd4b52368 (patch)
treed34960496812c3fee82d7fd56136ebe5638ac5a6 /.mailmap
parent38935861d85a4d9a353d1dd5a156c97700e2765d (diff)
mm/compaction: stop isolation if too many pages are isolated and we have pages to migrate
In isolate_migratepages_block, if we have too many isolated pages and nr_migratepages is not zero, we should try to migrate what we have without wasting time on isolating. In theory it's possible that multiple parallel compactions will cause too_many_isolated() to become true even if each has isolated less than COMPACT_CLUSTER_MAX, and loop forever in the while loop. Bailing immediately prevents that. [vbabka@suse.cz: changelog addition] Fixes: 1da2f328fa64 (“mm,thp,compaction,cma: allow THP migration for CMA allocations”) Suggested-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: <stable@vger.kernel.org> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Michal Hocko <mhocko@kernel.org> Cc: Rik van Riel <riel@surriel.com> Cc: Yang Shi <shy828301@gmail.com> Link: https://lkml.kernel.org/r/20201030183809.3616803-2-zi.yan@sent.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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