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authorMinchan Kim <minchan@kernel.org>2012-10-08 16:31:55 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-09 16:22:43 +0900
commit02c6de8d757cb32c0829a45d81c3dfcbcafd998b (patch)
tree0d8f0d182a44ba4ec4af0c909d01eb663e03e254 /mm/page_alloc.c
parent70400303ce0c4ced3139499c676d5c79636b0c72 (diff)
downloadlwn-02c6de8d757cb32c0829a45d81c3dfcbcafd998b.tar.gz
lwn-02c6de8d757cb32c0829a45d81c3dfcbcafd998b.zip
mm: cma: discard clean pages during contiguous allocation instead of migration
Drop clean cache pages instead of migration during alloc_contig_range() to minimise allocation latency by reducing the amount of migration that is necessary. It's useful for CMA because latency of migration is more important than evicting the background process's working set. In addition, as pages are reclaimed then fewer free pages for migration targets are required so it avoids memory reclaiming to get free pages, which is a contributory factor to increased latency. I measured elapsed time of __alloc_contig_migrate_range() which migrates 10M in 40M movable zone in QEMU machine. Before - 146ms, After - 7ms [akpm@linux-foundation.org: fix nommu build] Signed-off-by: Mel Gorman <mgorman@suse.de> Signed-off-by: Minchan Kim <minchan@kernel.org> Reviewed-by: Mel Gorman <mgorman@suse.de> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Acked-by: Michal Nazarewicz <mina86@mina86.com> Cc: Rik van Riel <riel@redhat.com> Tested-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index cfd565dbe124..cefd14e6dcf2 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5700,6 +5700,8 @@ static int __alloc_contig_migrate_range(unsigned long start, unsigned long end)
break;
}
+ reclaim_clean_pages_from_list(cc.zone, &cc.migratepages);
+
ret = migrate_pages(&cc.migratepages,
__alloc_contig_migrate_alloc,
0, false, MIGRATE_SYNC);