Re: [PATCH 2/9] mm: vmscan: Obey proportional scanning requirementsfor kswapd

From: Kamezawa Hiroyuki
Date: Thu May 16 2013 - 23:42:01 EST

(2013/05/13 17:12), Mel Gorman wrote:
> Simplistically, the anon and file LRU lists are scanned proportionally
> depending on the value of vm.swappiness although there are other factors
> taken into account by get_scan_count(). The patch "mm: vmscan: Limit
> the number of pages kswapd reclaims" limits the number of pages kswapd
> reclaims but it breaks this proportional scanning and may evenly shrink
> anon/file LRUs regardless of vm.swappiness.
> This patch preserves the proportional scanning and reclaim. It does mean
> that kswapd will reclaim more than requested but the number of pages will
> be related to the high watermark.
> [mhocko@xxxxxxx: Correct proportional reclaim for memcg and simplify]
> [kamezawa.hiroyu@xxxxxxxxxxxxxx: Recalculate scan based on target]
> [hannes@xxxxxxxxxxx: Account for already scanned pages properly]
> Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
> Acked-by: Rik van Riel <riel@xxxxxxxxxx>

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>

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