On 05/29/2011 02:13 PM, Minchan Kim wrote:
There are some places to isolate lru page and I believe users of isolate_lru_page will be growing. The purpose of them is each different so part of isolated pages should put back to LRU, again. The problem is when we put back the page into LRU, we lose LRU ordering and the page is inserted at head of LRU list. It makes unnecessary LRU churning so that vm can evict working set pages rather than idle pages. This patch adds new modes when we isolate page in LRU so we don't isolate pages if we can't handle it. It could reduce LRU churning. This patch doesn't change old behavior. It's just used by next patches. Cc: KOSAKI Motohiro<kosaki.motohiro@xxxxxxxxxxxxxx> Cc: Mel Gorman<mgorman@xxxxxxx> Cc: Rik van Riel<riel@xxxxxxxxxx> Cc: Andrea Arcangeli<aarcange@xxxxxxxxxx> Cc: Johannes Weiner<hannes@xxxxxxxxxxx> Cc: KAMEZAWA Hiroyuki<kamezawa.hiroyu@xxxxxxxxxxxxxx> Signed-off-by: Minchan Kim<minchan.kim@xxxxxxxxx>
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