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| author | Chuyi Zhou <zhouchuyi@bytedance.com> | 2022-07-13 14:20:09 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-10-12 15:56:45 -0700 |
| commit | 7efc3b7261030da79001c00d92bc3392fd6c664c (patch) | |
| tree | 6d96954ad03bd2991c3019a72a2e5974f3575a99 /mm | |
| parent | acfac37851e01b40c30a7afd0d93ad8db8914f25 (diff) | |
| download | lwn-7efc3b7261030da79001c00d92bc3392fd6c664c.tar.gz lwn-7efc3b7261030da79001c00d92bc3392fd6c664c.zip | |
mm/compaction: fix set skip in fast_find_migrateblock
When we successfully find a pageblock in fast_find_migrateblock(), the
block will be set skip-flag through set_pageblock_skip(). However, when
entering isolate_migratepages_block(), the whole pageblock will be skipped
due to the branch 'if (!valid_page && IS_ALIGNED(low_pfn,
pageblock_nr_pages))'. Eventually we will goto isolate_abort and isolate
nothing. That makes fast_find_migrateblock useless.
In this patch, when we find a suitable pageblock in
fast_find_migrateblock, we do noting but let isolate_migratepages_block to
set skip flag to the pageblock after scan it. Normally, we would isolate
some pages from the fast-find block.
I use mmtest/thpscale-madvhugepage test it. Here is the result:
baseline patch
Amean fault-both-1 1331.66 ( 0.00%) 1261.04 * 5.30%*
Amean fault-both-3 1383.95 ( 0.00%) 1191.69 * 13.89%*
Amean fault-both-5 1568.13 ( 0.00%) 1445.20 * 7.84%*
Amean fault-both-7 1819.62 ( 0.00%) 1555.13 * 14.54%*
Amean fault-both-12 1106.96 ( 0.00%) 1149.43 * -3.84%*
Amean fault-both-18 2196.93 ( 0.00%) 1875.77 * 14.62%*
Amean fault-both-24 2642.69 ( 0.00%) 2671.21 * -1.08%*
Amean fault-both-30 2901.89 ( 0.00%) 2857.32 * 1.54%*
Amean fault-both-32 3747.00 ( 0.00%) 3479.23 * 7.15%*
Link: https://lkml.kernel.org/r/20220713062009.597255-1-zhouchuyi@bytedance.com
Fixes: 70b44595eafe9 ("mm, compaction: use free lists to quickly locate a migration source")
Signed-off-by: zhouchuyi <zhouchuyi@bytedance.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/compaction.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/mm/compaction.c b/mm/compaction.c index e2a9615f5fde..c4e4453187a2 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -1851,7 +1851,6 @@ static unsigned long fast_find_migrateblock(struct compact_control *cc) pfn = cc->zone->zone_start_pfn; cc->fast_search_fail = 0; found_block = true; - set_pageblock_skip(freepage); break; } } |