linux-ext4 - Re: [PATCH, RFC 2/3] jbd2: Change j_state_lock to be a rwlock

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Date:	Tue, 3 Aug 2010 20:08:39 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	ocfs2-devel@....oracle.com
Cc:	John Stultz <johnstul@...ibm.com>,
	Keith Maanthey <kmannth@...ibm.com>,
	Eric Whitney <eric.whitney@...com>
Subject: Re: [PATCH, RFC 2/3] jbd2: Change j_state_lock to be a rwlock_t

On Tue, Aug 03, 2010 at 12:01:54PM -0400, Theodore Ts'o wrote:
> Lockstat reports have shown that j_state_lock is a major source of
> lock contention, especially on systems with more than 4 CPU cores.  So
> change it to be a read/write spinlock.
> 
> Signed-off-by: "Theodore Ts'o" <tytso@....edu>

Oops, this patch can result in a BUG_ON in fs/jbd2/transaction.c.  I'm
currently testing a fix/replacement patch, but I figured I send a
quick warning to folks not to waste time trying this out just yet.  I
should hopefully have a new, better-tested patch in by tomorrow
morning.

						- Ted

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