linux-ext4 - Re: [PATCH] ext3: wait on all pending commits in ext3_sync

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Message-ID: <494AFA16.2010004@redhat.com>
Date:	Thu, 18 Dec 2008 19:34:14 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	Jan Kara <jack@...e.cz>
CC:	Arthur Jones <ajones@...erbed.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"sct@...hat.com" <sct@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ext3: wait on all pending commits in ext3_sync_fs

Jan Kara wrote:

>> In looking at what we have today, I wonder if we can make things smarter
>> so that we don't commit empty transactions in any case?
>   Probably it does not make sence to commit such transactions and we might
> save some time in sync paths if we do so. So yes, I think skipping empty
> transaction commit might be worthwhile and it shouldn't be hard to do
> either. But I'd give it serious testing just in case some unexpectedly
> relies on this behaviour - wouldn't this interfere e.g. with sync
> transaction batching autotuning code? Untested patch below...
> 								Honza


Cool, thanks!  This's stop:

# sync

from spinning up disks under idle filesystems too, I think.

I was looking at something similar but was still working out how many
things to check before deciding if the transaction was in fact empty.  :)

-Eric
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