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

[Johannes Weiner]

On Thu, May 01, 2014 at 09:44:32AM +0100, 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>

Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/