Re: [PATCH 03/10] mm: vmscan: Flatten kswapd priority loop
From: Mel Gorman
Date: Tue Mar 19 2013 - 07:01:45 EST
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.
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