Messages in this thread | | | Date | Tue, 19 Mar 2013 11:01:37 +0000 | From | Mel Gorman <> | Subject | Re: [PATCH 03/10] mm: vmscan: Flatten kswapd priority loop |
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On Tue, Mar 19, 2013 at 06:26:43PM +0800, Simon Jeons wrote: > >>>- if (sc.nr_reclaimed >= SWAP_CLUSTER_MAX) > >>>- break; > >>>- } while (--sc.priority >= 0); > >>>+ if (order && sc.nr_reclaimed >= 2UL << order) > >>>+ order = sc.order = 0; > >>If order == 0 is meet, should we do defrag for it? > >> > >Compaction is unnecessary for order-0. > > > > I mean since order && sc.reclaimed >= 2UL << order, it is reclaimed > for high order allocation, if order == 0 is meet, should we do > defrag for it? >
I don't get this question at all. We do not defrag via compaction for order-0 allocation requests because it makes no sense.
-- Mel Gorman SUSE Labs
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