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authorMinchan Kim <minchan.kim@gmail.com>2011-10-31 17:06:55 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-08-01 12:27:16 -0700
commit5e02dde6aee7c4492b3a62ad93e7f1120877a019 (patch)
treeea27226fff5a55ddf9a94d5f7a3d14cc6b87b0dc /mm/percpu-vm.c
parent19faec0520b3b16dfd58cde30938a3c4d3dcdd5b (diff)
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mm: zone_reclaim: make isolate_lru_page() filter-aware
commit f80c0673610e36ae29d63e3297175e22f70dde5f upstream. Stable note: Not tracked in Bugzilla. THP and compaction disrupt the LRU list leading to poor reclaim decisions which has a variable performance impact. In __zone_reclaim case, we don't want to shrink mapped page. Nonetheless, we have isolated mapped page and re-add it into LRU's head. It's unnecessary CPU overhead and makes LRU churning. Of course, when we isolate the page, the page might be mapped but when we try to migrate the page, the page would be not mapped. So it could be migrated. But race is rare and although it happens, it's no big deal. Signed-off-by: Minchan Kim <minchan.kim@gmail.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Cc: Mel Gorman <mgorman@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Mel Gorman <mgorman@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm/percpu-vm.c')
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