linux-kernel - Re: [PATCH 0/1] mm, shmem: map few pages around fault address if they are in page cache

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Date:	Fri, 28 Feb 2014 16:35:16 -0800
From:	Ning Qu <quning@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Hugh Dickins <hughd@...gle.com>
Cc:	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@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Ning Qu <quning@...gle.com>
Subject: Re: [PATCH 0/1] mm, shmem: map few pages around fault address if they
 are in page cache

Sorry about my fault about the experiments, here is the real one.

Btw, apparently, there are still some questions about the results and
I will sync with Kirill about his test command line.

Below is just some simple experiment numbers from this patch, let me know if
you would like more:

Tested on Xeon machine with 64GiB of RAM, using the current default fault
order 4.

Sequential access 8GiB file
                        Baseline        with-patch
1 thread
    minor fault         8,389,052    4,456,530
    time, seconds    9.55            8.31

Random access 8GiB file
                        Baseline        with-patch
1 thread
    minor fault         8,389,315   6,423,386
    time, seconds    11.68         10.51



Best wishes,
-- 
Ning Qu
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