From: Andrea Arcangeli <aarcange@redhat.com>
To: "Dike, Jeffrey G" <jeffrey.g.dike@intel.com>
Cc: Avi Kivity <avi@redhat.com>,
"Wu, Fengguang" <fengguang.wu@intel.com>,
Rik van Riel <riel@redhat.com>,
"Yu, Wilfred" <wilfred.yu@intel.com>,
"Kleen, Andi" <andi.kleen@intel.com>,
Hugh Dickins <hugh.dickins@tiscali.co.uk>,
Andrew Morton <akpm@linux-foundation.org>,
Christoph Lameter <cl@linux-foundation.org>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Mel Gorman <mel@csn.ul.ie>, LKML <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>
Subject: Re: [RFC] respect the referenced bit of KVM guest pages?
Date: Wed, 5 Aug 2009 18:19:49 +0200 [thread overview]
Message-ID: <20090805161949.GE23385@random.random> (raw)
In-Reply-To: <9EECC02A4CC333418C00A85D21E89326B651C0BD@azsmsx502.amr.corp.intel.com>
On Wed, Aug 05, 2009 at 09:12:39AM -0700, Dike, Jeffrey G wrote:
> Sounds like there's some terminology confusion. A refault is a page
> being discarded due to memory pressure and subsequently being
> faulted back in. I was counting the number of faults between the
> discard and faulting back in for each affected page. For a large
> number of predominately stack pages, that number was very small.
Hmm ok, but if it's anonymous pages we're talking about here (I see
KVM in the equation so it has to be!) normally we call that thing
swapin to imply I/O is involved, not refault... Refault to me sounds
minor fault from swapcache (clean or dirty) and that's about it...
Anon page becomes swapcache, it is unmapped if young bit permits, and
then it's collected from lru eventually, if it is collected I/O will
be generated as swapin during the next page fault.
If it's too much swapin, then yes, it could be that patch that
prevents young bit to keep the anon pages in active list. But fix is
to remove the whole check, not just to enable list_add for anon pages.
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next prev parent reply other threads:[~2009-08-05 16:20 UTC|newest]
Thread overview: 122+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-05 2:40 [RFC] respect the referenced bit of KVM guest pages? Wu Fengguang
2009-08-05 4:15 ` KOSAKI Motohiro
2009-08-05 4:41 ` Wu Fengguang
2009-08-05 7:58 ` Avi Kivity
2009-08-05 8:17 ` Avi Kivity
2009-08-05 14:33 ` Rik van Riel
2009-08-05 15:37 ` Avi Kivity
2009-08-05 14:15 ` Rik van Riel
2009-08-05 15:12 ` Avi Kivity
2009-08-05 15:15 ` Rik van Riel
2009-08-05 15:25 ` Avi Kivity
2009-08-05 16:35 ` Andrea Arcangeli
2009-08-05 16:31 ` Andrea Arcangeli
2009-08-05 17:25 ` Rik van Riel
2009-08-05 15:45 ` Dike, Jeffrey G
2009-08-05 16:05 ` Andrea Arcangeli
2009-08-05 16:12 ` Dike, Jeffrey G
2009-08-05 16:19 ` Andrea Arcangeli [this message]
2009-08-05 15:58 ` Andrea Arcangeli
2009-08-05 17:20 ` Rik van Riel
2009-08-05 17:42 ` Rik van Riel
2009-08-06 10:15 ` Andrea Arcangeli
2009-08-06 10:08 ` Andrea Arcangeli
2009-08-06 10:18 ` Avi Kivity
2009-08-06 10:20 ` Andrea Arcangeli
2009-08-06 10:59 ` Wu Fengguang
2009-08-06 11:44 ` Avi Kivity
2009-08-06 13:06 ` Wu Fengguang
2009-08-06 13:16 ` Rik van Riel
2009-08-16 3:28 ` Wu Fengguang
2009-08-16 3:56 ` Rik van Riel
2009-08-16 4:43 ` Balbir Singh
2009-08-16 4:55 ` Wu Fengguang
2009-08-16 5:59 ` Balbir Singh
2009-08-17 19:47 ` Dike, Jeffrey G
2009-08-21 18:24 ` Balbir Singh
2009-08-31 19:43 ` Dike, Jeffrey G
2009-08-31 19:52 ` Rik van Riel
2009-08-31 20:06 ` Dike, Jeffrey G
2009-08-31 20:09 ` Rik van Riel
2009-08-31 20:11 ` Dike, Jeffrey G
2009-08-31 20:42 ` Balbir Singh
2009-08-06 13:46 ` Avi Kivity
2009-08-06 21:09 ` Jeff Dike
2009-08-16 3:18 ` Wu Fengguang
2009-08-16 3:53 ` Rik van Riel
2009-08-16 5:15 ` Wu Fengguang
2009-08-16 11:29 ` Wu Fengguang
2009-08-17 14:33 ` Minchan Kim
2009-08-18 2:34 ` Wu Fengguang
2009-08-18 4:17 ` Minchan Kim
2009-08-18 9:31 ` Wu Fengguang
2009-08-18 9:52 ` Minchan Kim
2009-08-18 10:00 ` Wu Fengguang
2009-08-18 11:00 ` Minchan Kim
2009-08-18 11:11 ` Wu Fengguang
2009-08-18 14:03 ` Minchan Kim
2009-08-18 16:27 ` KOSAKI Motohiro
2009-08-18 15:57 ` KOSAKI Motohiro
2009-08-19 12:01 ` Wu Fengguang
2009-08-19 12:05 ` KOSAKI Motohiro
2009-08-19 12:10 ` Wu Fengguang
2009-08-19 12:25 ` Minchan Kim
2009-08-19 13:19 ` KOSAKI Motohiro
2009-08-19 13:28 ` Minchan Kim
2009-08-21 11:17 ` KOSAKI Motohiro
2009-08-19 13:24 ` Wu Fengguang
2009-08-19 13:38 ` Minchan Kim
2009-08-19 14:00 ` Wu Fengguang
2009-08-06 13:13 ` Rik van Riel
2009-08-06 13:49 ` Avi Kivity
2009-08-07 3:11 ` KOSAKI Motohiro
2009-08-07 7:54 ` Balbir Singh
2009-08-07 8:24 ` KAMEZAWA Hiroyuki
2009-08-06 13:11 ` Rik van Riel
2009-08-06 13:08 ` Rik van Riel
2009-08-07 3:17 ` KOSAKI Motohiro
2009-08-12 7:48 ` Wu Fengguang
2009-08-12 14:31 ` Rik van Riel
2009-08-13 1:03 ` Wu Fengguang
2009-08-13 15:46 ` Rik van Riel
2009-08-13 16:12 ` Avi Kivity
2009-08-13 16:26 ` Rik van Riel
2009-08-13 19:12 ` Avi Kivity
2009-08-13 21:16 ` Johannes Weiner
2009-08-14 7:16 ` Avi Kivity
2009-08-14 9:10 ` Johannes Weiner
2009-08-14 9:51 ` Wu Fengguang
2009-08-14 13:19 ` Rik van Riel
2009-08-15 5:45 ` Wu Fengguang
2009-08-16 5:09 ` Balbir Singh
2009-08-16 5:41 ` Wu Fengguang
2009-08-16 5:50 ` Wu Fengguang
2009-08-18 15:57 ` KOSAKI Motohiro
2009-08-17 18:04 ` Dike, Jeffrey G
2009-08-18 2:26 ` Wu Fengguang
2009-09-02 19:30 ` Dike, Jeffrey G
2009-09-03 2:04 ` Wu Fengguang
2009-09-04 20:06 ` Dike, Jeffrey G
2009-09-04 20:57 ` Rik van Riel
2009-08-18 15:57 ` KOSAKI Motohiro
2009-08-19 12:08 ` Wu Fengguang
2009-08-19 13:40 ` [RFC] memcg: move definitions to .h and inline some functions Wu Fengguang
2009-08-19 14:18 ` KAMEZAWA Hiroyuki
2009-08-19 14:27 ` Balbir Singh
2009-08-20 1:34 ` Wu Fengguang
2009-08-14 21:42 ` [RFC] respect the referenced bit of KVM guest pages? Dike, Jeffrey G
2009-08-14 22:37 ` Rik van Riel
2009-08-15 5:32 ` Wu Fengguang
2009-09-13 16:23 ` KOSAKI Motohiro
2009-08-05 17:53 ` Rik van Riel
2009-08-05 19:00 ` Dike, Jeffrey G
2009-08-05 19:07 ` Rik van Riel
2009-08-05 19:18 ` Dike, Jeffrey G
2009-08-06 9:22 ` Avi Kivity
2009-08-06 9:25 ` Wu Fengguang
2009-08-06 9:35 ` Avi Kivity
2009-08-06 9:35 ` Wu Fengguang
2009-08-06 9:59 ` Avi Kivity
2009-08-06 9:59 ` Wu Fengguang
2009-08-06 10:14 ` Avi Kivity
2009-08-07 1:25 ` KAMEZAWA Hiroyuki
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