linux-kernel - Re: [PATCH] doc: add information about max_ptes

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Message-ID: <55FC224F.2020308@redhat.com>
Date:	Fri, 18 Sep 2015 10:40:15 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Ebru Akagunduz <ebru.akagunduz@...il.com>, linux-mm@...ck.org
CC:	akpm@...ux-foundation.org, rientjes@...gle.com, oleg@...hat.com,
	kirill.shutemov@...ux.intel.com, dave@...olabs.net,
	denc716@...il.com, ldufour@...ux.vnet.ibm.com,
	sasha.levin@...cle.com, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] doc: add information about max_ptes_swap

On 09/17/2015 05:34 PM, Ebru Akagunduz wrote:
> max_ptes_swap specifies how many pages can be brought in from
> swap when collapsing a group of pages into a transparent huge page.
> 
> /sys/kernel/mm/transparent_hugepage/khugepaged/max_ptes_swap
> 
> A higher value can cause excessive swap IO and waste
> memory. A lower value can prevent THPs from being
> collapsed, resulting fewer pages being collapsed into
> THPs, and lower memory access performance.
> 
> Signed-off-by: Ebru Akagunduz <ebru.akagunduz@...il.com>

Acked-by: Rik van Riel <riel@...hat.com>

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