linux-kernel - Re: Linux 2.6.29

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Message-Id: <20090402090912.cac200bb.akpm@linux-foundation.org>
Date:	Thu, 2 Apr 2009 09:09:12 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Janne Grunau <j@...nau.net>
Cc:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>, David Rees <drees76@...il.com>,
	Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29

On Thu, 2 Apr 2009 13:05:32 +0200 Janne Grunau <j@...nau.net> wrote:

> MythTV calls fsync every few seconds on ongoing recordings to prevent
> stalls due to large cache writebacks on ext3.

It should use sync_file_range(SYNC_FILE_RANGE_WRITE).  That will

- have minimum latency.  It tries to avoid blocking at all.

- avoid writing metadata

- avoid syncing other unrelated files within ext3

- avoid waiting for the ext3 commit to complete.

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