Re: [PATCH 1/2] blktrace: treat flush as barrier

[Christoph Hellwig]

On Sat, May 28, 2011 at 11:09:41AM +0900, Namhyung Kim wrote:
> AFAIK FLUSH always precedes WRITE and then followed by FUA, so how about

Right now most do because that's how the old barriers worked, but it's
going to change.  For $NEXT + 1 I have a patch that for will make
xfs sends FUA without flushes in a lot of cases, and afaik some device
mapper code already does now.

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