linux-ext4 - Re: [PATCH] block: Add a trace point whenever a barrier IO request is sent

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Message-ID: <20100421212727.GY27497@kernel.dk>
Date:	Wed, 21 Apr 2010 23:27:27 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	"Darrick J. Wong" <djwong@...ibm.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] block: Add a trace point whenever a barrier IO request
	is  sent

On Wed, Apr 21 2010, Darrick J. Wong wrote:
> Simple debugging patch used to watch for barrier requests.  I've been using
> this to watch ext4's barrier=1 behavior.

But barriers are already being logged, if you watch blkparse data, it'll
be RB or WB events. So I don't see what this addition provides that we
don't already have?

-- 
Jens Axboe

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