From: Anthony Liguori <anthony@codemonkey.ws>
To: Avi Kivity <avi@redhat.com>
Cc: 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>
Subject: Re: [PATCH][RF C/T/D] Unmapped page cache control - via boot parameter
Date: Mon, 15 Mar 2010 13:48:46 -0500 [thread overview]
Message-ID: <4B9E810E.9010706@codemonkey.ws> (raw)
In-Reply-To: <4B9DFD9C.8030608@redhat.com>
On 03/15/2010 04:27 AM, Avi Kivity wrote:
>
> That's only beneficial if the cache is shared. Otherwise, you could
> use the balloon to evict cache when memory is tight.
>
> Shared cache is mostly a desktop thing where users run similar
> workloads. For servers, it's much less likely. So a modified-guest
> doesn't help a lot here.
Not really. In many cloud environments, there's a set of common images
that are instantiated on each node. Usually this is because you're
running a horizontally scalable application or because you're supporting
an ephemeral storage model.
In fact, with ephemeral storage, you typically want to use
cache=writeback since you aren't providing data guarantees across
shutdown/failure.
Regards,
Anthony Liguori
WARNING: multiple messages have this Message-ID (diff)
From: Anthony Liguori <anthony@codemonkey.ws>
To: Avi Kivity <avi@redhat.com>
Cc: 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>
Subject: Re: [PATCH][RF C/T/D] Unmapped page cache control - via boot parameter
Date: Mon, 15 Mar 2010 13:48:46 -0500 [thread overview]
Message-ID: <4B9E810E.9010706@codemonkey.ws> (raw)
In-Reply-To: <4B9DFD9C.8030608@redhat.com>
On 03/15/2010 04:27 AM, Avi Kivity wrote:
>
> That's only beneficial if the cache is shared. Otherwise, you could
> use the balloon to evict cache when memory is tight.
>
> Shared cache is mostly a desktop thing where users run similar
> workloads. For servers, it's much less likely. So a modified-guest
> doesn't help a lot here.
Not really. In many cloud environments, there's a set of common images
that are instantiated on each node. Usually this is because you're
running a horizontally scalable application or because you're supporting
an ephemeral storage model.
In fact, with ephemeral storage, you typically want to use
cache=writeback since you aren't providing data guarantees across
shutdown/failure.
Regards,
Anthony Liguori
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next prev parent reply other threads:[~2010-03-15 18:48 UTC|newest]
Thread overview: 98+ 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 7:22 ` Balbir Singh
2010-03-15 7:48 ` Avi Kivity
2010-03-15 7:48 ` Avi Kivity
2010-03-15 8:07 ` Balbir Singh
2010-03-15 8:07 ` Balbir Singh
2010-03-15 8:27 ` Avi Kivity
2010-03-15 8:27 ` Avi Kivity
2010-03-15 9:17 ` Balbir Singh
2010-03-15 9:17 ` Balbir Singh
2010-03-15 9:27 ` Avi Kivity
2010-03-15 9:27 ` Avi Kivity
2010-03-15 10:45 ` Balbir Singh
2010-03-15 10:45 ` Balbir Singh
2010-03-15 18:48 ` Anthony Liguori [this message]
2010-03-15 18:48 ` Anthony Liguori
2010-03-16 9:05 ` Avi Kivity
2010-03-16 9:05 ` Avi Kivity
2010-03-19 7:23 ` Dave Hansen
2010-03-19 7:23 ` Dave Hansen
2010-03-15 20:23 ` Chris Webb
2010-03-15 20:23 ` Chris Webb
2010-03-15 23:43 ` Anthony Liguori
2010-03-15 23:43 ` Anthony Liguori
2010-03-16 0:43 ` Christoph Hellwig
2010-03-16 0:43 ` Christoph Hellwig
2010-03-16 1:27 ` Anthony Liguori
2010-03-16 1:27 ` Anthony Liguori
2010-03-16 8:19 ` Christoph Hellwig
2010-03-16 8:19 ` Christoph Hellwig
2010-03-17 15:14 ` Chris Webb
2010-03-17 15:14 ` Chris Webb
2010-03-17 15:55 ` Anthony Liguori
2010-03-17 15:55 ` Anthony Liguori
2010-03-17 16:27 ` Chris Webb
2010-03-17 16:27 ` Chris Webb
2010-03-22 21:04 ` Chris Webb
2010-03-22 21:04 ` Chris Webb
2010-03-22 21:07 ` Avi Kivity
2010-03-22 21:07 ` Avi Kivity
2010-03-22 21:10 ` Chris Webb
2010-03-22 21:10 ` Chris Webb
2010-03-17 16:27 ` Balbir Singh
2010-03-17 16:27 ` Balbir Singh
2010-03-17 17:05 ` Vivek Goyal
2010-03-17 17:05 ` Vivek Goyal
2010-03-17 19:11 ` Chris Webb
2010-03-17 19:11 ` Chris Webb
2010-03-16 3:16 ` Balbir Singh
2010-03-16 3:16 ` Balbir Singh
2010-03-16 9:17 ` Avi Kivity
2010-03-16 9:17 ` Avi Kivity
2010-03-16 9:54 ` Kevin Wolf
2010-03-16 9:54 ` Kevin Wolf
2010-03-16 10:16 ` Avi Kivity
2010-03-16 10:16 ` Avi Kivity
2010-03-16 10:26 ` Christoph Hellwig
2010-03-16 10:26 ` Christoph Hellwig
2010-03-16 10:36 ` Avi Kivity
2010-03-16 10:36 ` Avi Kivity
2010-03-16 10:44 ` Christoph Hellwig
2010-03-16 10:44 ` Christoph Hellwig
2010-03-16 11:08 ` Avi Kivity
2010-03-16 11:08 ` Avi Kivity
2010-03-16 14:27 ` Balbir Singh
2010-03-16 14:27 ` Balbir Singh
2010-03-16 15:59 ` Avi Kivity
2010-03-16 15:59 ` Avi Kivity
2010-03-17 8:49 ` Christoph Hellwig
2010-03-17 8:49 ` Christoph Hellwig
2010-03-17 9:10 ` Avi Kivity
2010-03-17 9:10 ` Avi Kivity
2010-03-17 15:24 ` Chris Webb
2010-03-17 15:24 ` Chris Webb
2010-03-17 16:22 ` Avi Kivity
2010-03-17 16:22 ` Avi Kivity
2010-03-17 16:40 ` Avi Kivity
2010-03-17 16:40 ` Avi Kivity
2010-03-17 16:47 ` Chris Webb
2010-03-17 16:47 ` Chris Webb
2010-03-17 16:53 ` Avi Kivity
2010-03-17 16:53 ` Avi Kivity
2010-03-17 16:58 ` Christoph Hellwig
2010-03-17 16:58 ` Christoph Hellwig
2010-03-17 17:03 ` Avi Kivity
2010-03-17 17:03 ` Avi Kivity
2010-03-17 16:57 ` Christoph Hellwig
2010-03-17 16:57 ` Christoph Hellwig
2010-03-17 17:06 ` Avi Kivity
2010-03-17 17:06 ` Avi Kivity
2010-03-17 16:52 ` Christoph Hellwig
2010-03-17 16:52 ` Christoph Hellwig
2010-03-17 17:02 ` Avi Kivity
2010-03-17 17:02 ` Avi Kivity
2010-03-15 15:46 ` Randy Dunlap
2010-03-15 15:46 ` Randy Dunlap
2010-03-16 3:21 ` Balbir Singh
2010-03-16 3:21 ` Balbir Singh
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