Re: [RFC] ext4: Don't send extra barrier during fsync if there areno dirty pages.

From: Avi Kivity
Date: Wed Aug 04 2010 - 22:20:30 EST

On 08/05/2010 02:32 AM, Ted Ts'o wrote:
On Tue, Aug 03, 2010 at 04:24:49PM +0300, Avi Kivity wrote:
On 06/30/2010 03:48 PM, tytso@xxxxxxx 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


The system call exists, it's called io_submit().
Um, not the same thing at all.

Why not? To be clear, I'm talking about an io_submit() with multiple IO_CMD_FSYNC requests, with a kernel implementation that is able to batch these requests.

I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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