Messages in this thread | | | Date | Thu, 26 Aug 2010 10:03:05 +0100 | From | Mel Gorman <> | Subject | Re: [PATCH v2 1/2] compaction: handle active and inactive fairly in too_many_isolated |
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On Wed, Aug 25, 2010 at 12:31:18AM +0900, Minchan Kim wrote: > Iram reported compaction's too_many_isolated loops forever. > (http://www.spinics.net/lists/linux-mm/msg08123.html) > > The meminfo of situation happened was inactive anon is zero. > That's because the system has no memory pressure until then. > While all anon pages was in active lru, compaction could select > active lru as well as inactive lru. That's different things > with vmscan's isolated. So we has been two too_many_isolated. > > While compaction can isolated pages in both active and inactive, > current implementation of too_many_isolated only considers inactive. > It made Iram's problem. > > This patch handles active and inactive with fair. > That's because we can't expect where from and how many compaction would > isolated pages. > > This patch changes (nr_isolated > nr_inactive) with > nr_isolated > (nr_active + nr_inactive) / 2. > > Cc: Iram Shahzad <iram.shahzad@jp.fujitsu.com> > Acked-by: Mel Gorman <mel@csn.ul.ie> > Acked-by: Wu Fengguang <fengguang.wu@intel.com> > Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
Please send this patch on its own as it looks like it should be merged and arguably is a stable candidate for 2.6.35. Alternatively, Andrew, can you pick up just this patch? It seems unrelated to the second patch on COMPACTPAGEFAILED.
-- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab
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