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| author | Mel Gorman <mgorman@techsingularity.net> | 2023-05-15 13:33:42 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-06-10 01:25:20 +0200 |
| commit | 9ecc5fc50a9c75b0af252913163a9f1ac4206b17 (patch) | |
| tree | 32ecaa4dd9fba57a2a34f57023d42e6244c1d88c /mm/compaction.c | |
| parent | mm: compaction: ensure rescanning only happens on partially scanned pageblocks (diff) | |
| download | linux-9ecc5fc50a9c75b0af252913163a9f1ac4206b17.tar.xz linux-9ecc5fc50a9c75b0af252913163a9f1ac4206b17.zip | |
mm: compaction: only force pageblock scan completion when skip hints are obeyed
fast_find_migrateblock relies on skip hints to avoid rescanning a recently
selected pageblock but compact_zone() only forces the pageblock scan
completion to set the skip hint if in direct compaction. While this
prevents direct compaction repeatedly scanning a subset of blocks due to
fast_find_migrateblock(), it does not prevent proactive compaction, node
compaction and kcompactd encountering the same problem described in commit
cfccd2e63e7e ("mm, compaction: finish pageblocks on complete migration
failure").
Force the scan completion of a pageblock to set the skip hint if skip
hints are obeyed to prevent fast_find_migrateblock() repeatedly selecting
a subset of pageblocks.
Link: https://lkml.kernel.org/r/20230515113344.6869-3-mgorman@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Tested-by: Raghavendra K T <raghavendra.kt@amd.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Chuyi Zhou <zhouchuyi@bytedance.com>
Cc: Jiri Slaby <jirislaby@kernel.org>
Cc: Maxim Levitsky <mlevitsk@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Pedro Falcato <pedro.falcato@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/compaction.c')
| -rw-r--r-- | mm/compaction.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/compaction.c b/mm/compaction.c index d16b0fcd6db5..009128d1e4ef 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -2457,7 +2457,8 @@ rescan: } /* * If an ASYNC or SYNC_LIGHT fails to migrate a page - * within the current order-aligned block, scan the + * within the current order-aligned block and + * fast_find_migrateblock may be used then scan the * remainder of the pageblock. This will mark the * pageblock "skip" to avoid rescanning in the near * future. This will isolate more pages than necessary @@ -2466,7 +2467,7 @@ rescan: * recently partially scanned. */ if (!pageblock_aligned(cc->migrate_pfn) && - cc->direct_compaction && !cc->finish_pageblock && + !cc->ignore_skip_hint && !cc->finish_pageblock && (cc->mode < MIGRATE_SYNC)) { cc->finish_pageblock = true; |