From: Christoph Hellwig <hch@lst.de>
To: Avi Kivity <avi@redhat.com>
Cc: Chris Webb <chris@arachsys.com>,
balbir@linux.vnet.ibm.com,
KVM development list <kvm@vger.kernel.org>,
Rik van Riel <riel@surriel.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Christoph Hellwig <hch@lst.de>, Kevin Wolf <kwolf@redhat.com>
Subject: Re: [PATCH][RF C/T/D] Unmapped page cache control - via boot parameter
Date: Wed, 17 Mar 2010 17:58:54 +0100 [thread overview]
Message-ID: <20100317165854.GC29548@lst.de> (raw)
In-Reply-To: <4BA1090E.9090502@redhat.com>
On Wed, Mar 17, 2010 at 06:53:34PM +0200, Avi Kivity wrote:
> Meanwhile I looked at the code, and it looks bad. There is an
> IO_CMD_FDSYNC, but it isn't tagged, so we have to drain the queue before
> issuing it. In any case, qemu doesn't use it as far as I could tell,
> and even if it did, device-matter doesn't implement the needed
> ->aio_fsync() operation.
No one implements it, and all surrounding code is dead wood. It would
require us to do asynchronous pagecache operations, which involve
major surgery of the VM code. Patches to do this were rejected multiple
times.
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next prev parent reply other threads:[~2010-03-17 16:59 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-15 7:22 [PATCH][RF C/T/D] Unmapped page cache control - via boot parameter Balbir Singh
2010-03-15 7:48 ` Avi Kivity
2010-03-15 8:07 ` Balbir Singh
2010-03-15 8:27 ` Avi Kivity
2010-03-15 9:17 ` Balbir Singh
2010-03-15 9:27 ` Avi Kivity
2010-03-15 10:45 ` Balbir Singh
2010-03-15 18:48 ` Anthony Liguori
2010-03-16 9:05 ` Avi Kivity
2010-03-19 7:23 ` Dave Hansen
2010-03-15 20:23 ` Chris Webb
2010-03-15 23:43 ` Anthony Liguori
2010-03-16 0:43 ` Christoph Hellwig
2010-03-16 1:27 ` Anthony Liguori
2010-03-16 8:19 ` Christoph Hellwig
2010-03-17 15:14 ` Chris Webb
2010-03-17 15:55 ` Anthony Liguori
2010-03-17 16:27 ` Chris Webb
2010-03-22 21:04 ` Chris Webb
2010-03-22 21:07 ` Avi Kivity
2010-03-22 21:10 ` Chris Webb
2010-03-17 16:27 ` Balbir Singh
2010-03-17 17:05 ` Vivek Goyal
2010-03-17 19:11 ` Chris Webb
2010-03-16 3:16 ` Balbir Singh
2010-03-16 9:17 ` Avi Kivity
2010-03-16 9:54 ` Kevin Wolf
2010-03-16 10:16 ` Avi Kivity
2010-03-16 10:26 ` Christoph Hellwig
2010-03-16 10:36 ` Avi Kivity
2010-03-16 10:44 ` Christoph Hellwig
2010-03-16 11:08 ` Avi Kivity
2010-03-16 14:27 ` Balbir Singh
2010-03-16 15:59 ` Avi Kivity
2010-03-17 8:49 ` Christoph Hellwig
2010-03-17 9:10 ` Avi Kivity
2010-03-17 15:24 ` Chris Webb
2010-03-17 16:22 ` Avi Kivity
2010-03-17 16:40 ` Avi Kivity
2010-03-17 16:47 ` Chris Webb
2010-03-17 16:53 ` Avi Kivity
2010-03-17 16:58 ` Christoph Hellwig [this message]
2010-03-17 17:03 ` Avi Kivity
2010-03-17 16:57 ` Christoph Hellwig
2010-03-17 17:06 ` Avi Kivity
2010-03-17 16:52 ` Christoph Hellwig
2010-03-17 17:02 ` Avi Kivity
2010-03-15 15:46 ` Randy Dunlap
2010-03-16 3:21 ` Balbir Singh
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