linux-kernel - Re: [RFC v5 0/3] mm: make swapin readahead to gain more thp performance

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Message-Id: <20150914144106.ee205c3ae3f4ec0e5202c9fe@linux-foundation.org>
Date:	Mon, 14 Sep 2015 14:41:06 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ebru Akagunduz <ebru.akagunduz@...il.com>
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 0/3] mm: make swapin readahead to gain more thp
 performance

On Mon, 14 Sep 2015 22:31:42 +0300 Ebru Akagunduz <ebru.akagunduz@...il.com> wrote:

> This patch series makes swapin readahead up to a
> certain number to gain more thp performance and adds
> tracepoint for khugepaged_scan_pmd, collapse_huge_page,
> __collapse_huge_page_isolate.

I'll merge this series for testing.  Hopefully Andrea and/or Hugh will
find time for a quality think about the issue before 4.3 comes around.

It would be much better if we didn't have that sysfs knob - make the
control automatic in some fashion.

If we can't think of a way of doing that then at least let's document
max_ptes_swap very carefully.  Explain to our users what it does, why
they should care about it, how they should set about determining (ie:
measuring) its effect upon their workloads.

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