From: Izik Eidus <ieidus@redhat.com>
To: Jonathan Corbet <corbet@lwn.net>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
kvm@vger.kernel.org, aarcange@redhat.com, chrisw@redhat.com,
avi@redhat.com
Subject: Re: [PATCH 3/4] add ksm kernel shared memory driver
Date: Wed, 12 Nov 2008 01:02:47 +0200 [thread overview]
Message-ID: <491A0F17.2070706@redhat.com> (raw)
In-Reply-To: <20081111153028.422b301a@bike.lwn.net>
Jonathan Corbet wrote:
>
> What about things like cache effects from scanning all those pages? My
> guess is that, if you're trying to run dozens of Windows guests, cache
> usage is not at the top of your list of concerns, but I could be
> wrong. Usually am...
>
Ok, ksm does make the cache of the cpu dirty when scanning the pages
(but the scanning happen slowly slowly and cache usually get dirty much
faster)
But infact it improve the cache by the fact that it make many ptes point
to the same page
so if before we had 12 process touching 12 diffrent physical page they
would dirty the page
but now they will touch just one...
so i guess it depend on how you see it...
> Thanks,
>
> jon
>
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next prev parent reply other threads:[~2008-11-11 23:02 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-11 13:21 [PATCH 0/4] ksm - dynamic page sharing driver for linux Izik Eidus
2008-11-11 13:21 ` [PATCH 1/4] rmap: add page_wrprotect() function, Izik Eidus, Izik Eidus
2008-11-11 13:21 ` [PATCH 2/4] Add replace_page(), change the mapping of pte from one page into another Izik Eidus, Izik Eidus
2008-11-11 13:21 ` [PATCH 3/4] add ksm kernel shared memory driver Izik Eidus, Izik Eidus
2008-11-11 13:21 ` [PATCH 4/4] MMU_NOTIFIRES: add set_pte_at_notify() Izik Eidus, Izik Eidus
2008-11-11 20:38 ` [PATCH 3/4] add ksm kernel shared memory driver Andrew Morton
2008-11-11 22:03 ` Andrea Arcangeli
2008-11-11 22:03 ` Jonathan Corbet
2008-11-11 22:17 ` Izik Eidus
2008-11-11 22:25 ` Jonathan Corbet
2008-11-11 22:31 ` Izik Eidus
2008-11-11 22:30 ` Jonathan Corbet
2008-11-11 22:38 ` Izik Eidus
2008-11-11 23:02 ` Izik Eidus [this message]
2008-11-11 23:03 ` Andrea Arcangeli
2008-11-11 22:49 ` Avi Kivity
2008-11-11 22:40 ` Valdis.Kletnieks
2008-11-13 6:13 ` Eric Rannaud
2008-11-11 22:43 ` Avi Kivity
2008-11-11 19:45 ` [PATCH 2/4] Add replace_page(), change the mapping of pte from one page into another Andrew Morton
2008-11-11 20:57 ` Izik Eidus
2008-11-11 21:21 ` Christoph Lameter
2008-11-11 21:23 ` Izik Eidus
2008-11-11 21:31 ` Christoph Lameter
2008-11-11 21:37 ` Izik Eidus
2008-11-11 22:24 ` Andrea Arcangeli
2008-11-12 2:19 ` KAMEZAWA Hiroyuki
2008-11-12 10:05 ` Avi Kivity
2008-11-12 11:11 ` Izik Eidus
2008-11-13 6:11 ` KAMEZAWA Hiroyuki
2008-11-13 10:38 ` Izik Eidus
2008-11-13 11:32 ` KAMEZAWA Hiroyuki
2008-11-11 21:35 ` Andrea Arcangeli
2008-11-11 21:06 ` Andrea Arcangeli
2008-11-11 21:26 ` Christoph Lameter
2008-11-11 21:39 ` Avi Kivity
2008-11-11 21:47 ` Christoph Lameter
2008-11-11 21:55 ` Izik Eidus
2008-11-11 22:36 ` Avi Kivity
2008-11-11 22:17 ` Andrea Arcangeli
2008-11-11 22:30 ` Christoph Lameter
2008-11-11 23:17 ` Andrea Arcangeli
2008-11-11 23:25 ` Andrea Arcangeli
2008-11-12 0:27 ` Christoph Lameter
2008-11-12 2:27 ` Andrea Arcangeli
2008-11-12 3:10 ` Christoph Lameter
2008-11-12 17:32 ` Andrea Arcangeli
2008-11-12 20:08 ` Lee Schermerhorn
2008-11-12 20:31 ` Christoph Lameter
2008-11-12 20:27 ` Christoph Lameter
2008-11-12 22:09 ` Lee Schermerhorn
2008-11-13 2:00 ` Andrea Arcangeli
2008-11-13 2:31 ` Andrea Arcangeli
2008-11-13 4:02 ` Nick Piggin
2008-11-11 19:39 ` [PATCH 1/4] rmap: add page_wrprotect() function, Andrew Morton
2008-11-11 20:38 ` Andrea Arcangeli
2008-11-11 21:01 ` Andrew Morton
2008-11-11 21:17 ` Andrea Arcangeli
2008-11-11 18:30 ` [PATCH 0/4] ksm - dynamic page sharing driver for linux Andrew Morton
2008-11-11 18:48 ` Avi Kivity
2008-11-11 19:08 ` Izik Eidus
2008-11-11 19:11 ` Andrew Morton
2008-11-11 19:18 ` Izik Eidus
2008-11-11 19:32 ` Andrew Morton
2008-11-11 19:52 ` Izik Eidus
2008-11-11 20:08 ` Izik Eidus
2008-11-11 19:29 ` Avi Kivity
2008-11-11 19:55 ` Andrea Arcangeli
2008-11-11 19:07 ` Izik Eidus
2008-11-11 19:20 ` Andrew Morton
-- strict thread matches above, loose matches on Subject: below --
2008-11-17 2:20 [PATCH 0/4] ksm - dynamic page sharing driver for linux v2 Izik Eidus
2008-11-17 2:20 ` [PATCH 1/4] Rmap: Add page_wrprotect() function Izik Eidus
2008-11-17 2:20 ` [PATCH 2/4] Add replace_page(): change the page pte is pointing to Izik Eidus
2008-11-17 2:20 ` [PATCH 3/4] add ksm kernel shared memory driver Izik Eidus
2008-11-28 16:58 ` Alan Cox
2008-12-02 18:07 ` Chris Wright
2008-12-02 18:13 ` Alan Cox
2008-12-02 21:24 ` Chris Wright
2008-12-02 21:37 ` Jonathan Corbet
2008-12-02 22:10 ` Alan Cox
2008-12-03 14:33 ` Pavel Machek
2008-12-04 9:48 ` Alan Cox
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