Re: [PATCH 1/4] pagemap: avoid splitting thp when reading/proc/pid/pagemap

From: KAMEZAWA Hiroyuki
Date: Mon Dec 26 2011 - 03:27:49 EST

On Wed, 21 Dec 2011 17:23:45 -0500
Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> wrote:

> Thp split is not necessary if we explicitly check whether pmds are
> mapping thps or not. This patch introduces the check and the code
> to generate pagemap entries for pmds mapping thps, which results in
> less performance impact of pagemap on thp.
> Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
> Reviewed-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> Changes since v1:
> - move pfn declaration to the beginning of pagemap_pte_range()
> ---

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

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