Re: [PATCH 01/17] mm: page_alloc: Do not update zlc unless the zlc is active

[Rik van Riel]

On 05/01/2014 04:44 AM, Mel Gorman wrote:
> The zlc is used on NUMA machines to quickly skip over zones that are full.
> However it is always updated, even for the first zone scanned when the
> zlc might not even be active. As it's a write to a bitmap that potentially
> bounces cache line it's deceptively expensive and most machines will not
> care. Only update the zlc if it was active.
> 
> Signed-off-by: Mel Gorman <mgorman@xxxxxxx>

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

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