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Message-ID: <43EAFEB9.2060000@yahoo.com.au>
Date: Thu, 09 Feb 2006 19:35:05 +1100
From: Nick Piggin <nickpiggin@yahoo.com.au>
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To: Andrew Morton <akpm@osdl.org>
CC: linux@horizon.com, linux-kernel@vger.kernel.org, sct@redhat.com
Subject: Re: msync() behaviour broken for MS_ASYNC, revert patch?
References: <20060209071832.10500.qmail@science.horizon.com> <20060209001850.18ca135f.akpm@osdl.org>
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Andrew Morton wrote:

> 
> 2.4:
> 
> 	MS_ASYNC: dirty the pagecache pages, start I/O
> 	MS_SYNC: dirty the pagecache pages, start I/O, wait on I/O
> 
> 2.6:
> 
> 	MS_ASYNC: dirty the pagecache pages
> 	MS_SYNC: dirty the pagecache pages, start I/O, wait on I/O.
> 
> So you're saying that doing the I/O in that 25-100msec window allowed your
> app to do more pipelining.
> 
> I think for most scenarios, what we have in 2.6 is better: it gives the app
> more control over when the I/O should be started. 

How so?

-- 
SUSE Labs, Novell Inc.
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