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authorMel Gorman <mgorman@suse.de>2012-01-12 17:19:38 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-08-01 12:27:17 -0700
commita7e32d7a2a801b7838b4159e9d73ea86f68ae002 (patch)
tree2eb36db6a3b61cc42974dfd4a15aef2195cd1d59 /mm/compaction.c
parentc17a36656685a2af6ea9e99fa243a7103b643d12 (diff)
mm: compaction: make isolate_lru_page() filter-aware again
commit c82449352854ff09e43062246af86bdeb628f0c3 upstream. Stable note: Not tracked in Bugzilla. A fix aimed at preserving page aging information by reducing LRU list churning had the side-effect of reducing THP allocation success rates. This was part of a series to restore the success rates while preserving the reclaim fix. Commit 39deaf85 ("mm: compaction: make isolate_lru_page() filter-aware") noted that compaction does not migrate dirty or writeback pages and that is was meaningless to pick the page and re-add it to the LRU list. This had to be partially reverted because some dirty pages can be migrated by compaction without blocking. This patch updates "mm: compaction: make isolate_lru_page" by skipping over pages that migration has no possibility of migrating to minimise LRU disruption. Signed-off-by: Mel Gorman <mgorman@suse.de> Reviewed-by: Rik van Riel<riel@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Reviewed-by: Minchan Kim <minchan@kernel.org> Cc: Dave Jones <davej@redhat.com> Cc: Jan Kara <jack@suse.cz> Cc: Andy Isaacson <adi@hexapodia.org> Cc: Nai Xia <nai.xia@gmail.com> Cc: Johannes Weiner <jweiner@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm/compaction.c')
-rw-r--r--mm/compaction.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/compaction.c b/mm/compaction.c
index 228f91b57182..da449202ff9d 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -371,6 +371,9 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
continue;
}
+ if (!cc->sync)
+ mode |= ISOLATE_ASYNC_MIGRATE;
+
/* Try isolate the page */
if (__isolate_lru_page(page, mode, 0) != 0)
continue;