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

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Message-ID: <alpine.DEB.2.10.1509211546480.27715@chino.kir.corp.google.com>
Date:	Mon, 21 Sep 2015 15:47:06 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Ebru Akagunduz <ebru.akagunduz@...il.com>
cc:	linux-mm@...ck.org, riel@...hat.com, akpm@...ux-foundation.org,
	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 Fri, 18 Sep 2015, 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: David Rientjes <rientjes@...gle.com>
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