linux-kernel - Re: [PATCHv3 0/2] mm: map few pages around fault address if they are in page cache

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Message-ID: <20140312142247.GA11013@node.dhcp.inet.fi>
Date:	Wed, 12 Mar 2014 16:22:47 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Dave Chinner <david@...morbit.com>, Ning Qu <quning@...il.com>,
	linux-mm <linux-mm@...ck.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv3 0/2] mm: map few pages around fault address if they are
 in page cache

On Thu, Feb 27, 2014 at 01:28:22PM -0800, Linus Torvalds wrote:
>  (a) could you test this on a couple of different architectures?


Here's data from 4-socket Westmere. The advantage of faultaround is not that
obvious here.

FAULT_AROUND_ORDER              baseline        2               4               6

Linux build (make -j40)
minor-faults                    297,626,681     245,934,795     227,800,211     221,052,532
time, seconds                   293.4322        291.4602        292.9198        295.2355

Linux rebuild (make -j40)
minor-faults                    5,903,936       3,802,148       3,018,728       2,735,602
time, seconds                   41.5657         41.0301         40.7621         41.1161

Git test suite
minor-faults                    171,314,056     109,187,718     81,955,503      70,172,157
time, seconds                   223.2327        220.2623        223.8355        231.7843

I don't have time to test on Haswell now. Probably later.

-- 
 Kirill A. Shutemov
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