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@xxxxxxxxxxxxxx> --- 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>