Messages in this thread | | | Date | Thu, 18 Nov 2010 18:10:48 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [PATCH 7/8] mm: compaction: Use the LRU to get a hint on where compaction should start |
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On Wed, 17 Nov 2010 16:22:48 +0000 Mel Gorman <mel@csn.ul.ie> wrote:
> The end of the LRU stores the oldest known page. Compaction on the other > hand always starts scanning from the start of the zone. This patch uses > the LRU to hint to compaction where it should start scanning from. This > means that compaction will at least start with some old pages reducing > the impact on running processes and reducing the amount of scanning. The > check it makes is racy as the LRU lock is not taken but it should be > harmless as we are not manipulating the lists without the lock. > > Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Hmm, does this patch make a noticable difference ? Isn't it better to start scan from the biggest free chunk in a zone ?
Thanks, -Kame
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