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Date: Thu, 15 Apr 2010 13:11:37 +0900 (JST) From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> To: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> Cc: kosaki.motohiro@...fujitsu.com, Dave Chinner <david@...morbit.com>, Mel Gorman <mel@....ul.ie>, Chris Mason <chris.mason@...cle.com>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, linux-fsdevel@...r.kernel.org Subject: [PATCH 1/4] vmscan: delegate pageout io to flusher thread if current is kswapd Now, vmscan pageout() is one of IO throuput degression source. Some IO workload makes very much order-0 allocation and reclaim and pageout's 4K IOs are making annoying lots seeks. At least, kswapd can avoid such pageout() because kswapd don't need to consider OOM-Killer situation. that's no risk. Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> --- mm/vmscan.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 3ff3311..d392a50 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -614,6 +614,13 @@ static enum page_references page_check_references(struct page *page, if (referenced_page) return PAGEREF_RECLAIM_CLEAN; + /* + * Delegate pageout IO to flusher thread. They can make more + * effective IO pattern. + */ + if (current_is_kswapd()) + return PAGEREF_RECLAIM_CLEAN; + return PAGEREF_RECLAIM; } -- 1.6.5.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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