From: Jens Axboe <jens.axboe@oracle.com>
To: "Darrick J. Wong" <djwong@us.ibm.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
linux-ext4 <linux-ext4@vger.kernel.org>
Subject: Re: [PATCH] block: Add a trace point whenever a barrier IO request is sent
Date: Wed, 21 Apr 2010 23:27:27 +0200 [thread overview]
Message-ID: <20100421212727.GY27497@kernel.dk> (raw)
In-Reply-To: <20100421205626.GA15607@tux1.beaverton.ibm.com>
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
next prev parent reply other threads:[~2010-04-21 21:27 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-21 20:56 [PATCH] block: Add a trace point whenever a barrier IO request is sent Darrick J. Wong
2010-04-21 21:27 ` Jens Axboe [this message]
2010-04-23 19:41 ` Darrick J. Wong
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