Messages in this thread Patch in this message | | | From | KOSAKI Motohiro <> | Subject | [PATCH 4/4] vmscan: delegate page cleaning io to flusher thread if VM pressure is low | Date | Thu, 15 Apr 2010 13:15:11 +0900 (JST) |
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Even if pageout() is called from direct reclaim, we can delegate io to flusher thread if vm pressure is low.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> --- mm/vmscan.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c index 8b78b49..eab6028 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -623,6 +623,13 @@ static enum page_references page_check_references(struct page *page, if (current_is_kswapd()) return PAGEREF_RECLAIM_CLEAN; + /* + * Now VM pressure is not so high. then we can delegate + * page cleaning to flusher thread safely. + */ + if (!sc->order && sc->priority > DEF_PRIORITY/2) + return PAGEREF_RECLAIM_CLEAN; + return PAGEREF_RECLAIM; } -- 1.6.5.2
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