linux-ext4 - Re: [PATCH RFC] jbd: don't wake kjournald unnecessarily

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Date:	Wed, 19 Dec 2012 15:27:34 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Jan Kara <jack@...e.cz>
Cc:	Eric Sandeen <sandeen@...hat.com>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH RFC] jbd: don't wake kjournald unnecessarily

On Wed, Dec 19, 2012 at 06:14:01PM +0100, Jan Kara wrote:
>   I agree. Just I'm still somewhat puzzled by those two reports pointed to
> by Eric. In both cases stored tids were 0 and I cannot see how that happens
> (well how it could happen in a reasonably likely way).

I'm also really puzzled about how Eric's patch makes a 10% different
on the AIM7 benchmark; as you've pointed out, that will just cause an
extra wakeup of the jbd/jbd2 thread, which should then quickly check
and decide to go back to sleep.

					- Ted
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