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authorMel Gorman <mgorman@techsingularity.net>2019-03-06 00:45:18 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2019-03-06 06:07:17 +0100
commit8854c55f54bcc104e3adae42abe16948286ec75c (patch)
tree0a7ea9d9c74534019d11145c8b5b303823882221 /lib/memory-notifier-error-inject.c
parentmm, compaction: check early for huge pages encountered by the migration scanner (diff)
downloadlinux-8854c55f54bcc104e3adae42abe16948286ec75c.tar.xz
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mm, compaction: keep cached migration PFNs synced for unusable pageblocks
Migrate has separate cached PFNs for ASYNC and SYNC* migration on the basis that some migrations will fail in ASYNC mode. However, if the cached PFNs match at the start of scanning and pageblocks are skipped due to having no isolation candidates, then the sync state does not matter. This patch keeps matching cached PFNs in sync until a pageblock with isolation candidates is found. The actual benefit is marginal given that the sync scanner following the async scanner will often skip a number of pageblocks but it's useless work. Any benefit depends heavily on whether the scanners restarted recently. Link: http://lkml.kernel.org/r/20190118175136.31341-16-mgorman@techsingularity.net Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Dan Carpenter <dan.carpenter@oracle.com> Cc: David Rientjes <rientjes@google.com> Cc: YueHaibing <yuehaibing@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/memory-notifier-error-inject.c')
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