Re: [patch v2 3/3] mm: page_alloc: fair zone allocator policy

[Rik van Riel]

On 08/02/2013 11:37 AM, Johannes Weiner wrote:
> Each zone that holds userspace pages of one workload must be aged at a
> speed proportional to the zone size.  Otherwise, the time an
> individual page gets to stay in memory depends on the zone it happened
> to be allocated in.  Asymmetry in the zone aging creates rather
> unpredictable aging behavior and results in the wrong pages being
> reclaimed, activated etc.


> When zone_reclaim_mode is enabled, allocations will now spread out to
> all zones on the local node, not just the first preferred zone (which
> on a 4G node might be a tiny Normal zone).
>
> Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
> Tested-by: Zlatko Calusic <zcalusic@xxxxxxxxxxx>

Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>


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