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SubjectRe: [PATCH 12/63] mm: numa: Do not migrate or account for hinting faults on the zero page
On 10/07/2013 06:28 AM, Mel Gorman wrote:
> The zero page is not replicated between nodes and is often shared between
> processes. The data is read-only and likely to be cached in local CPUs
> if heavily accessed meaning that the remote memory access cost is less
> of a concern. This patch prevents trapping faults on the zero pages. For
> tasks using the zero page this will reduce the number of PTE updates,
> TLB flushes and hinting faults.
>
> [peterz@infradead.org: Correct use of is_huge_zero_page]
> Signed-off-by: Mel Gorman <mgorman@suse.de>

Reviewed-by: Rik van Riel <riel@redhat.com>


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