linux-ext4 - Re: [Ocfs2-devel] [PATCH -v2 0/3] jbd2 scalability patches

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Message-ID: <20100809160652.GA4743@mail.oracle.com>
Date:	Mon, 9 Aug 2010 09:06:55 -0700
From:	Joel Becker <Joel.Becker@...cle.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	ocfs2-devel@....oracle.com, Keith Maanthey <kmannth@...ibm.com>,
	John Stultz <johnstul@...ibm.com>,
	Eric Whitney <eric.whitney@...com>
Subject: Re: [Ocfs2-devel] [PATCH -v2 0/3] jbd2 scalability patches

On Wed, Aug 04, 2010 at 12:39:14PM -0400, Theodore Ts'o wrote:
> This version fixes three bugs in the 2nd patch of this series that
> caused kernel BUG when the system was under race.  We weren't accounting
> with t_oustanding_credits correctly, and there were race conditions
> caused by the fact the I had overlooked the fact that
> __jbd2_log_wait_for_space() and jbd2_get_transaction() requires
> j_state_lock to be write locked.
> 

Here's an initial set of runs.  Not the fastest disk ever, but it shows
the patches don't hurt us.

http://oss.oracle.com/~mmatsuna/ocfs2-test/FFSB/FFSB.html

Joel

-- 

"I inject pure kryptonite into my brain.
 It improves my kung fu, and it eases the pain."


Joel Becker
Consulting Software Developer
Oracle
E-mail: joel.becker@...cle.com
Phone: (650) 506-8127
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