From: Dave Hansen <dave@linux.vnet.ibm.com>
To: balbir@linux.vnet.ibm.com
Cc: Avi Kivity <avi@redhat.com>, kvm <kvm@vger.kernel.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC/T/D][PATCH 2/2] Linux/Guest cooperative unmapped page cache control
Date: Mon, 14 Jun 2010 10:09:31 -0700 [thread overview]
Message-ID: <1276535371.6437.7417.camel@nimitz> (raw)
In-Reply-To: <20100614165853.GW5191@balbir.in.ibm.com>
On Mon, 2010-06-14 at 22:28 +0530, Balbir Singh wrote:
> If you've got duplicate pages and you know
> that they are duplicated and can be retrieved at a lower cost, why
> wouldn't we go after them first?
I agree with this in theory. But, the guest lacks the information about
what is truly duplicated and what the costs are for itself and/or the
host to recreate it. "Unmapped page cache" may be the best proxy that
we have at the moment for "easy to recreate", but I think it's still too
poor a match to make these patches useful.
-- Dave
WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave@linux.vnet.ibm.com>
To: balbir@linux.vnet.ibm.com
Cc: Avi Kivity <avi@redhat.com>, kvm <kvm@vger.kernel.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC/T/D][PATCH 2/2] Linux/Guest cooperative unmapped page cache control
Date: Mon, 14 Jun 2010 10:09:31 -0700 [thread overview]
Message-ID: <1276535371.6437.7417.camel@nimitz> (raw)
In-Reply-To: <20100614165853.GW5191@balbir.in.ibm.com>
On Mon, 2010-06-14 at 22:28 +0530, Balbir Singh wrote:
> If you've got duplicate pages and you know
> that they are duplicated and can be retrieved at a lower cost, why
> wouldn't we go after them first?
I agree with this in theory. But, the guest lacks the information about
what is truly duplicated and what the costs are for itself and/or the
host to recreate it. "Unmapped page cache" may be the best proxy that
we have at the moment for "easy to recreate", but I think it's still too
poor a match to make these patches useful.
-- Dave
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next prev parent reply other threads:[~2010-06-14 17:09 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-08 15:51 [RFC/T/D][PATCH 0/2] KVM page cache optimization (v2) Balbir Singh
2010-06-08 15:51 ` Balbir Singh
2010-06-08 15:51 ` [RFC][PATCH 1/2] Linux/Guest unmapped page cache control Balbir Singh
2010-06-08 15:51 ` Balbir Singh
2010-06-13 18:31 ` Balbir Singh
2010-06-13 18:31 ` Balbir Singh
2010-06-14 0:28 ` KAMEZAWA Hiroyuki
2010-06-14 0:28 ` KAMEZAWA Hiroyuki
2010-06-14 6:49 ` Balbir Singh
2010-06-14 6:49 ` Balbir Singh
2010-06-14 7:00 ` KAMEZAWA Hiroyuki
2010-06-14 7:00 ` KAMEZAWA Hiroyuki
2010-06-14 7:36 ` Balbir Singh
2010-06-14 7:36 ` Balbir Singh
2010-06-14 7:49 ` KAMEZAWA Hiroyuki
2010-06-14 7:49 ` KAMEZAWA Hiroyuki
2010-06-08 15:51 ` [RFC/T/D][PATCH 2/2] Linux/Guest cooperative " Balbir Singh
2010-06-08 15:51 ` Balbir Singh
2010-06-10 9:43 ` Avi Kivity
2010-06-10 9:43 ` Avi Kivity
2010-06-10 14:25 ` Balbir Singh
2010-06-10 14:25 ` Balbir Singh
2010-06-11 0:07 ` Dave Hansen
2010-06-11 0:07 ` Dave Hansen
2010-06-11 1:54 ` KAMEZAWA Hiroyuki
2010-06-11 1:54 ` KAMEZAWA Hiroyuki
2010-06-11 4:46 ` Balbir Singh
2010-06-11 4:46 ` Balbir Singh
2010-06-11 5:05 ` KAMEZAWA Hiroyuki
2010-06-11 5:05 ` KAMEZAWA Hiroyuki
2010-06-11 5:08 ` KAMEZAWA Hiroyuki
2010-06-11 5:08 ` KAMEZAWA Hiroyuki
2010-06-11 6:14 ` Balbir Singh
2010-06-11 6:14 ` Balbir Singh
2010-06-11 4:56 ` Balbir Singh
2010-06-11 4:56 ` Balbir Singh
2010-06-14 8:09 ` Avi Kivity
2010-06-14 8:09 ` Avi Kivity
2010-06-14 8:48 ` Balbir Singh
2010-06-14 8:48 ` Balbir Singh
2010-06-14 12:40 ` Avi Kivity
2010-06-14 12:40 ` Avi Kivity
2010-06-14 12:50 ` Balbir Singh
2010-06-14 12:50 ` Balbir Singh
2010-06-14 13:01 ` Avi Kivity
2010-06-14 13:01 ` Avi Kivity
2010-06-14 15:33 ` Dave Hansen
2010-06-14 15:33 ` Dave Hansen
2010-06-14 15:44 ` Avi Kivity
2010-06-14 15:44 ` Avi Kivity
2010-06-14 15:55 ` Dave Hansen
2010-06-14 15:55 ` Dave Hansen
2010-06-14 16:34 ` Avi Kivity
2010-06-14 16:34 ` Avi Kivity
2010-06-14 17:45 ` Balbir Singh
2010-06-14 17:45 ` Balbir Singh
2010-06-15 6:58 ` Avi Kivity
2010-06-15 6:58 ` Avi Kivity
2010-06-15 7:49 ` Balbir Singh
2010-06-15 7:49 ` Balbir Singh
2010-06-15 9:44 ` Avi Kivity
2010-06-15 9:44 ` Avi Kivity
2010-06-15 10:18 ` Balbir Singh
2010-06-15 10:18 ` Balbir Singh
2010-06-14 17:58 ` Dave Hansen
2010-06-14 17:58 ` Dave Hansen
2010-06-15 7:07 ` Avi Kivity
2010-06-15 7:07 ` Avi Kivity
2010-06-15 14:47 ` Dave Hansen
2010-06-15 14:47 ` Dave Hansen
2010-06-16 11:39 ` Avi Kivity
2010-06-16 11:39 ` Avi Kivity
2010-06-17 6:04 ` Balbir Singh
2010-06-17 6:04 ` Balbir Singh
2010-06-14 15:12 ` Dave Hansen
2010-06-14 15:12 ` Dave Hansen
2010-06-14 15:34 ` Avi Kivity
2010-06-14 15:34 ` Avi Kivity
2010-06-14 17:40 ` Balbir Singh
2010-06-14 17:40 ` Balbir Singh
2010-06-15 7:11 ` Avi Kivity
2010-06-15 7:11 ` Avi Kivity
2010-06-14 16:58 ` Balbir Singh
2010-06-14 16:58 ` Balbir Singh
2010-06-14 17:09 ` Dave Hansen [this message]
2010-06-14 17:09 ` Dave Hansen
2010-06-14 17:16 ` Balbir Singh
2010-06-14 17:16 ` Balbir Singh
2010-06-15 7:12 ` Avi Kivity
2010-06-15 7:12 ` Avi Kivity
2010-06-15 7:52 ` Balbir Singh
2010-06-15 7:52 ` Balbir Singh
2010-06-15 9:54 ` Avi Kivity
2010-06-15 9:54 ` Avi Kivity
2010-06-15 12:49 ` Balbir Singh
2010-06-15 12:49 ` Balbir Singh
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