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From: Chris Wright <chrisw@sous-sol.org>
To: Nai Xia <nai.xia@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Izik Eidus <izik.eidus@ravellosystems.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Hugh Dickins <hughd@google.com>,
	Chris Wright <chrisw@sous-sol.org>,
	Rik van Riel <riel@redhat.com>, linux-mm <linux-mm@kvack.org>,
	Johannes Weiner <hannes@cmpxchg.org>,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 0/2 V2] ksm: take dirty bit as reference to avoid volatile pages scanning
Date: Tue, 21 Jun 2011 17:46:08 -0700	[thread overview]
Message-ID: <20110622004608.GS25383@sequoia.sous-sol.org> (raw)
In-Reply-To: <201106212055.25400.nai.xia@gmail.com>

* Nai Xia (nai.xia@gmail.com) wrote:
> Compared to the first version, this patch set addresses the problem of
> dirty bit updating of virtual machines, by adding two mmu_notifier interfaces.
> So it can now track the volatile working set inside KVM guest OS.
> 
> V1 log:
> Currently, ksm uses page checksum to detect volatile pages. Izik Eidus 
> suggested that we could use pte dirty bit to optimize. This patch series
> adds this new logic.
> 
> Preliminary benchmarks show that the scan speed is improved by up to 16 
> times on volatile transparent huge pages and up to 8 times on volatile 
> regular pages.

Did you run this only in the host (which would not trigger the notifiers
to kvm), or also run your test program in a guest?

thanks,
-chris

WARNING: multiple messages have this Message-ID (diff)
From: Chris Wright <chrisw@sous-sol.org>
To: Nai Xia <nai.xia@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Izik Eidus <izik.eidus@ravellosystems.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Hugh Dickins <hughd@google.com>,
	Chris Wright <chrisw@sous-sol.org>,
	Rik van Riel <riel@redhat.com>, linux-mm <linux-mm@kvack.org>,
	Johannes Weiner <hannes@cmpxchg.org>,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 0/2 V2] ksm: take dirty bit as reference to avoid volatile pages scanning
Date: Tue, 21 Jun 2011 17:46:08 -0700	[thread overview]
Message-ID: <20110622004608.GS25383@sequoia.sous-sol.org> (raw)
In-Reply-To: <201106212055.25400.nai.xia@gmail.com>

* Nai Xia (nai.xia@gmail.com) wrote:
> Compared to the first version, this patch set addresses the problem of
> dirty bit updating of virtual machines, by adding two mmu_notifier interfaces.
> So it can now track the volatile working set inside KVM guest OS.
> 
> V1 log:
> Currently, ksm uses page checksum to detect volatile pages. Izik Eidus 
> suggested that we could use pte dirty bit to optimize. This patch series
> adds this new logic.
> 
> Preliminary benchmarks show that the scan speed is improved by up to 16 
> times on volatile transparent huge pages and up to 8 times on volatile 
> regular pages.

Did you run this only in the host (which would not trigger the notifiers
to kvm), or also run your test program in a guest?

thanks,
-chris

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  parent reply	other threads:[~2011-06-22  0:46 UTC|newest]

Thread overview: 96+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-06-21 12:55 [PATCH 0/2 V2] ksm: take dirty bit as reference to avoid volatile pages scanning Nai Xia
2011-06-21 12:55 ` Nai Xia
2011-06-21 13:26 ` [PATCH 1/2 " Nai Xia
2011-06-21 13:26   ` Nai Xia
2011-06-21 21:42   ` Chris Wright
2011-06-21 21:42     ` Chris Wright
2011-06-22  0:02     ` Nai Xia
2011-06-22  0:02       ` Nai Xia
2011-06-22  0:42       ` Chris Wright
2011-06-22  0:42         ` Chris Wright
2011-06-21 13:32 ` [PATCH] mmu_notifier, kvm: Introduce dirty bit tracking in spte and mmu notifier to help KSM dirty bit tracking Nai Xia
2011-06-21 13:32   ` Nai Xia
2011-06-22  0:21   ` Chris Wright
2011-06-22  0:21     ` Chris Wright
2011-06-22  4:43     ` Nai Xia
2011-06-22  4:43       ` Nai Xia
2011-06-22  6:15     ` Izik Eidus
2011-06-22  6:15       ` Izik Eidus
2011-06-22  6:38       ` Nai Xia
2011-06-22  6:38         ` Nai Xia
2011-06-22 15:46       ` Chris Wright
2011-06-22 15:46         ` Chris Wright
2011-06-22 10:43   ` Avi Kivity
2011-06-22 10:43     ` Avi Kivity
2011-06-22 11:05     ` Izik Eidus
2011-06-22 11:05       ` Izik Eidus
2011-06-22 11:10       ` Avi Kivity
2011-06-22 11:10         ` Avi Kivity
2011-06-22 11:19         ` Izik Eidus
2011-06-22 11:19           ` Izik Eidus
2011-06-22 11:24           ` Avi Kivity
2011-06-22 11:24             ` Avi Kivity
2011-06-22 11:28             ` Avi Kivity
2011-06-22 11:28               ` Avi Kivity
2011-06-22 11:31               ` Avi Kivity
2011-06-22 11:31                 ` Avi Kivity
2011-06-22 11:33               ` Nai Xia
2011-06-22 11:33                 ` Nai Xia
2011-06-22 11:39                 ` Izik Eidus
2011-06-22 11:39                   ` Izik Eidus
2011-06-22 15:39           ` Rik van Riel
2011-06-22 15:39             ` Rik van Riel
2011-06-22 16:55             ` Andrea Arcangeli
2011-06-22 16:55               ` Andrea Arcangeli
2011-06-22 23:37               ` Nai Xia
2011-06-22 23:37                 ` Nai Xia
2011-06-22 23:59                 ` Andrea Arcangeli
2011-06-22 23:59                   ` Andrea Arcangeli
2011-06-23  0:31                   ` Nai Xia
2011-06-23  0:31                     ` Nai Xia
2011-06-23  0:44                     ` Andrea Arcangeli
2011-06-23  0:44                       ` Andrea Arcangeli
2011-06-23  1:36                       ` Nai Xia
2011-06-23  1:36                         ` Nai Xia
2011-06-23  0:00                 ` Rik van Riel
2011-06-23  0:00                   ` Rik van Riel
2011-06-23  0:42                   ` Nai Xia
2011-06-23  0:42                     ` Nai Xia
2011-06-22 23:13             ` Nai Xia
2011-06-22 23:13               ` Nai Xia
2011-06-22 23:25               ` Andrea Arcangeli
2011-06-22 23:25                 ` Andrea Arcangeli
2011-06-23  1:30                 ` Nai Xia
2011-06-23  1:30                   ` Nai Xia
2011-06-22 23:28               ` Rik van Riel
2011-06-22 23:28                 ` Rik van Riel
2011-06-23  0:52                 ` Nai Xia
2011-06-23  0:52                   ` Nai Xia
2011-06-22 11:24     ` Nai Xia
2011-06-22 15:03   ` Andrea Arcangeli
2011-06-22 15:03     ` Andrea Arcangeli
2011-06-22 15:19     ` Izik Eidus
2011-06-22 15:19       ` Izik Eidus
2011-06-22 23:19     ` Nai Xia
2011-06-22 23:19       ` Nai Xia
2011-06-22 23:44       ` Andrea Arcangeli
2011-06-22 23:44         ` Andrea Arcangeli
2011-06-23  0:14         ` Nai Xia
2011-06-23  0:14           ` Nai Xia
2011-06-22 23:42     ` Nai Xia
2011-06-22 23:42       ` Nai Xia
2011-06-21 13:36 ` [PATCH 2/2 V2] ksm: take dirty bit as reference to avoid volatile pages scanning Nai Xia
2011-06-21 13:36   ` Nai Xia
2011-06-21 22:38   ` Chris Wright
2011-06-21 22:38     ` Chris Wright
2011-06-22  0:04     ` Nai Xia
2011-06-22  0:04       ` Nai Xia
2011-06-22  0:35       ` Chris Wright
2011-06-22  0:35         ` Chris Wright
2011-06-22  4:47         ` Nai Xia
2011-06-22  4:47           ` Nai Xia
2011-06-22 10:55         ` Nai Xia
2011-06-22 10:55           ` Nai Xia
2011-06-22  0:46 ` Chris Wright [this message]
2011-06-22  0:46   ` [PATCH 0/2 " Chris Wright
2011-06-22  4:15   ` Nai Xia

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