linux-kernel - Re: [PATCH 08/15] readahead: record readahead patterns

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Date:	Thu, 25 Feb 2010 17:37:31 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Chris Mason <chris.mason@...cle.com>,
	Clemens Ladisch <clemens@...isch.de>,
	Olivier Galibert <galibert@...ox.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Christian Ehrhardt <ehrhardt@...ux.vnet.ibm.com>,
	Matt Mackall <mpm@...enic.com>, Nick Piggin <npiggin@...e.de>,
	Linux Memory Management List <linux-mm@...ck.org>,
	linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 08/15] readahead: record readahead patterns

On 02/23/2010 10:10 PM, Wu Fengguang wrote:
> Record the readahead pattern in ra_flags. This info can be examined by
> users via the readahead tracing/stats interfaces.
>
> Currently 7 patterns are defined:
>
>        	pattern			readahead for
> -----------------------------------------------------------
> 	RA_PATTERN_INITIAL	start-of-file/oversize read
> 	RA_PATTERN_SUBSEQUENT	trivial     sequential read
> 	RA_PATTERN_CONTEXT	interleaved sequential read
> 	RA_PATTERN_THRASH	thrashed    sequential read
> 	RA_PATTERN_MMAP_AROUND	mmap fault
> 	RA_PATTERN_FADVISE	posix_fadvise()
> 	RA_PATTERN_RANDOM	random read
>
> CC: Ingo Molnar<mingo@...e.hu>
> CC: Jens Axboe<jens.axboe@...cle.com>
> CC: Peter Zijlstra<a.p.zijlstra@...llo.nl>
> Signed-off-by: Wu Fengguang<fengguang.wu@...el.com>

Acked-by: Rik van Riel <riel@...hat.com>

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