linux-kernel - Re: [ANNOUNCE] Native Linux KVM tool v2

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Message-ID: <20110616092429.GA5484@infradead.org>
Date:	Thu, 16 Jun 2011 05:24:29 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Anthony Liguori <anthony@...emonkey.ws>,
	Alexander Graf <agraf@...e.de>,
	Prasad Joshi <prasadjoshi124@...il.com>,
	Avi Kivity <avi@...hat.com>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Sasha Levin <levinsasha928@...il.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Asias He <asias.hejun@...il.com>,
	Jens Axboe <jaxboe@...ionio.com>
Subject: Re: [ANNOUNCE] Native Linux KVM tool v2

On Thu, Jun 16, 2011 at 09:21:03AM +0300, Pekka Enberg wrote:
> And btw, we use sync_file_range() 

Which doesn't help you at all.  sync_file_range is just a hint for VM
writeback, but never commits filesystem metadata nor the physical
disk's write cache.  In short it's a completely dangerous interface, and
that is pretty well documented in the man page.

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