linux-ext4 - Re: [RFC] ext4: Don't send extra barrier during fsync if there are no dirty pages.

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Message-ID: <20100804233206.GA2901@thunk.org>
Date:	Wed, 4 Aug 2010 19:32:06 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Avi Kivity <avi@...hat.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Ric Wheeler <rwheeler@...hat.com>,
	Mingming Cao <cmm@...ibm.com>, djwong@...ibm.com,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Keith Mannthey <kmannth@...ibm.com>,
	Mingming Cao <mcao@...ibm.com>
Subject: Re: [RFC] ext4: Don't send extra barrier during fsync if there are
 no dirty pages.

On Tue, Aug 03, 2010 at 04:24:49PM +0300, Avi Kivity wrote:
>  On 06/30/2010 03:48 PM, tytso@....edu wrote:
> >
> >I wonder if it's worthwhile to think about a new system call which
> >allows users to provide an array of fd's which are collectively should
> >be fsync'ed out at the same time.  Otherwise, we end up issuing
> >multiple barrier operations in cases where the application needs to
> >do:
> >
> >	fsync(control_fd);
> >	fsync(data_fd);
> >
> 
> The system call exists, it's called io_submit().

Um, not the same thing at all.

						- Ted
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