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Re: Directory fsync

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: Directory fsync
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Sun, 25 Sep 2011 20:51:07 -0400
Cc: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Zhu Han <schumi.han@xxxxxxxxx>
In-reply-to: <20110926002811.GA3159@dastard>
References: <CAF7KpS8h2KDsLVzwAj=5ig-yuuiCwjQSVk0Nfy9UJ0qiyAqeCQ@xxxxxxxxxxxxxx> <20110923163354.GA24319@xxxxxxxxxxxxx> <201109240109.45532@xxxxxx> <20110926002811.GA3159@dastard>
User-agent: Mutt/1.5.21 (2010-09-15)
On Mon, Sep 26, 2011 at 10:28:11AM +1000, Dave Chinner wrote:
> All it means is that the directory fsync() is a no-op that only
> costs CPU time.

Currently it also causes a superflous cache flush, but I have a patch
in my QA queue to fix that and reduce the (already tiny) CPU overhead a
bit more.

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