linux-kernel - Re: [RFC v5 2/3] mm: make optimistic check for swapin readahead

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Date:	Tue, 15 Sep 2015 23:08:21 +0300
From:	Ebru Akagunduz <ebru.akagunduz@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm@...ck.org, kirill.shutemov@...ux.intel.com,
	n-horiguchi@...jp.nec.com, aarcange@...hat.com, riel@...hat.com,
	iamjoonsoo.kim@....com, xiexiuqi@...wei.com, gorcunov@...nvz.org,
	linux-kernel@...r.kernel.org, mgorman@...e.de, rientjes@...gle.com,
	vbabka@...e.cz, aneesh.kumar@...ux.vnet.ibm.com, hughd@...gle.com,
	hannes@...xchg.org, mhocko@...e.cz, boaz@...xistor.com,
	raindel@...lanox.com
Subject: Re: [RFC v5 2/3] mm: make optimistic check for swapin readahead

On Mon, Sep 14, 2015 at 02:33:55PM -0700, Andrew Morton wrote:
> On Mon, 14 Sep 2015 22:31:44 +0300 Ebru Akagunduz <ebru.akagunduz@...il.com> wrote:
> 
> > This patch introduces new sysfs integer knob
> > /sys/kernel/mm/transparent_hugepage/khugepaged/max_ptes_swap
> > which makes optimistic check for swapin readahead to
> > increase thp collapse rate. Before getting swapped
> > out pages to memory, checks them and allows up to a
> > certain number. It also prints out using tracepoints
> > amount of unmapped ptes.
> 
> We we please get this control documented? 
> Documentation/vm/transhuge.txt appears to be the place for it.

I will add annotation about max_swap_ptes to doc and send it with new patch.

Kind regards,
Ebru
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