From: Jens Axboe on
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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