From: Andrea Arcangeli <aarcange@redhat.com>
To: Chris Wright <chrisw@redhat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Rik van Riel <riel@redhat.com>,
Hugh Dickins <hugh.dickins@tiscali.co.uk>,
Andrew Morton <akpm@linux-foundation.org>,
Izik Eidus <ieidus@redhat.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 2/9] ksm: let shared pages be swappable
Date: Fri, 4 Dec 2009 19:53:03 +0100 [thread overview]
Message-ID: <20091204185303.GL28697@random.random> (raw)
In-Reply-To: <20091204171640.GE19624@x200.localdomain>
On Fri, Dec 04, 2009 at 09:16:40AM -0800, Chris Wright wrote:
> That's why I mentioned the page of zeroes as the prime example of
> something with a high mapcount that shouldn't really ever be evicted.
Just a nitpick, "never" is too much, it should remain evictable if
somebody halts all VM from monitor and starts a workloads that fills
RAM and runs for a very prolonged time pushing all VM into swap. This
is especially true if we stick to the below approach and it isn't
just 1 page in high-sharing.
> It's a somewhat special case, but wouldn't it be useful to have a generic
> method to recognize this kind of sharing since it's a generic issue?
Agreed.
WARNING: multiple messages have this Message-ID (diff)
From: Andrea Arcangeli <aarcange@redhat.com>
To: Chris Wright <chrisw@redhat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Rik van Riel <riel@redhat.com>,
Hugh Dickins <hugh.dickins@tiscali.co.uk>,
Andrew Morton <akpm@linux-foundation.org>,
Izik Eidus <ieidus@redhat.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 2/9] ksm: let shared pages be swappable
Date: Fri, 4 Dec 2009 19:53:03 +0100 [thread overview]
Message-ID: <20091204185303.GL28697@random.random> (raw)
In-Reply-To: <20091204171640.GE19624@x200.localdomain>
On Fri, Dec 04, 2009 at 09:16:40AM -0800, Chris Wright wrote:
> That's why I mentioned the page of zeroes as the prime example of
> something with a high mapcount that shouldn't really ever be evicted.
Just a nitpick, "never" is too much, it should remain evictable if
somebody halts all VM from monitor and starts a workloads that fills
RAM and runs for a very prolonged time pushing all VM into swap. This
is especially true if we stick to the below approach and it isn't
just 1 page in high-sharing.
> It's a somewhat special case, but wouldn't it be useful to have a generic
> method to recognize this kind of sharing since it's a generic issue?
Agreed.
--
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next prev parent reply other threads:[~2009-12-04 18:53 UTC|newest]
Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-24 16:37 [PATCH 0/9] ksm: swapping Hugh Dickins
2009-11-24 16:37 ` Hugh Dickins
2009-11-24 16:40 ` [PATCH 1/9] ksm: fix mlockfreed to munlocked Hugh Dickins
2009-11-24 16:40 ` Hugh Dickins
2009-11-24 23:53 ` Rik van Riel
2009-11-24 23:53 ` Rik van Riel
2009-11-26 16:20 ` Mel Gorman
2009-11-26 16:20 ` Mel Gorman
2009-11-27 12:45 ` Hugh Dickins
2009-11-27 12:45 ` Hugh Dickins
2009-11-30 6:01 ` KOSAKI Motohiro
2009-11-30 6:01 ` KOSAKI Motohiro
2009-11-30 12:26 ` Hugh Dickins
2009-11-30 12:26 ` Hugh Dickins
2009-11-30 21:27 ` Lee Schermerhorn
2009-11-30 21:27 ` Lee Schermerhorn
2009-12-01 11:14 ` Mel Gorman
2009-12-01 11:14 ` Mel Gorman
2009-11-24 16:42 ` [PATCH 2/9] ksm: let shared pages be swappable Hugh Dickins
2009-11-24 16:42 ` Hugh Dickins
2009-11-30 0:46 ` KAMEZAWA Hiroyuki
2009-11-30 0:46 ` KAMEZAWA Hiroyuki
2009-11-30 9:15 ` KOSAKI Motohiro
2009-11-30 9:15 ` KOSAKI Motohiro
2009-11-30 12:38 ` Hugh Dickins
2009-11-30 12:38 ` Hugh Dickins
2009-12-01 4:14 ` KOSAKI Motohiro
2009-12-01 4:14 ` KOSAKI Motohiro
2009-11-30 11:55 ` Hugh Dickins
2009-11-30 11:55 ` Hugh Dickins
2009-11-30 12:07 ` Andrea Arcangeli
2009-11-30 12:07 ` Andrea Arcangeli
2009-12-01 0:39 ` KAMEZAWA Hiroyuki
2009-12-01 0:39 ` KAMEZAWA Hiroyuki
2009-12-01 6:32 ` Chris Wright
2009-12-01 6:32 ` Chris Wright
2009-12-01 9:11 ` Andrea Arcangeli
2009-12-01 9:11 ` Andrea Arcangeli
2009-12-01 9:28 ` KOSAKI Motohiro
2009-12-01 9:28 ` KOSAKI Motohiro
2009-12-01 9:37 ` Andrea Arcangeli
2009-12-01 9:37 ` Andrea Arcangeli
2009-12-01 9:46 ` KOSAKI Motohiro
2009-12-01 9:46 ` KOSAKI Motohiro
2009-12-01 9:59 ` Andrea Arcangeli
2009-12-01 9:59 ` Andrea Arcangeli
2009-12-02 5:08 ` Rik van Riel
2009-12-02 5:08 ` Rik van Riel
2009-12-02 12:55 ` Andrea Arcangeli
2009-12-02 12:55 ` Andrea Arcangeli
2009-12-03 5:15 ` KOSAKI Motohiro
2009-12-03 5:15 ` KOSAKI Motohiro
2009-12-04 5:06 ` KOSAKI Motohiro
2009-12-04 5:06 ` KOSAKI Motohiro
2009-12-04 5:16 ` KAMEZAWA Hiroyuki
2009-12-04 5:16 ` KAMEZAWA Hiroyuki
2009-12-04 14:49 ` Andrea Arcangeli
2009-12-04 14:49 ` Andrea Arcangeli
2009-12-04 17:16 ` Chris Wright
2009-12-04 17:16 ` Chris Wright
2009-12-04 18:53 ` Andrea Arcangeli [this message]
2009-12-04 18:53 ` Andrea Arcangeli
2009-12-04 19:03 ` Chris Wright
2009-12-04 19:03 ` Chris Wright
2009-12-09 0:43 ` KAMEZAWA Hiroyuki
2009-12-09 0:43 ` KAMEZAWA Hiroyuki
2009-12-09 1:04 ` Chris Wright
2009-12-09 1:04 ` Chris Wright
2009-12-09 16:12 ` Andrea Arcangeli
2009-12-09 16:12 ` Andrea Arcangeli
2009-12-09 23:54 ` KAMEZAWA Hiroyuki
2009-12-09 23:54 ` KAMEZAWA Hiroyuki
2009-12-04 14:45 ` Andrea Arcangeli
2009-12-04 14:45 ` Andrea Arcangeli
2009-12-04 16:21 ` Rik van Riel
2009-12-04 16:21 ` Rik van Riel
2009-11-24 16:43 ` [PATCH 3/9] ksm: hold anon_vma in rmap_item Hugh Dickins
2009-11-24 16:43 ` Hugh Dickins
2009-11-24 16:45 ` [PATCH 4/9] ksm: take keyhole reference to page Hugh Dickins
2009-11-24 16:45 ` Hugh Dickins
2009-11-24 16:48 ` [PATCH 5/9] ksm: share anon page without allocating Hugh Dickins
2009-11-24 16:48 ` Hugh Dickins
2009-11-30 0:04 ` KAMEZAWA Hiroyuki
2009-11-30 0:04 ` KAMEZAWA Hiroyuki
2009-11-30 11:18 ` Hugh Dickins
2009-11-30 11:18 ` Hugh Dickins
2009-12-01 0:02 ` KAMEZAWA Hiroyuki
2009-12-01 0:02 ` KAMEZAWA Hiroyuki
2009-11-24 16:51 ` [PATCH 6/9] ksm: mem cgroup charge swapin copy Hugh Dickins
2009-11-24 16:51 ` Hugh Dickins
2009-11-25 14:23 ` Balbir Singh
2009-11-25 14:23 ` Balbir Singh
2009-11-25 17:12 ` Hugh Dickins
2009-11-25 17:12 ` Hugh Dickins
2009-11-25 17:36 ` Balbir Singh
2009-11-25 17:36 ` Balbir Singh
2009-11-30 0:13 ` KAMEZAWA Hiroyuki
2009-11-30 0:13 ` KAMEZAWA Hiroyuki
2009-11-30 11:40 ` Hugh Dickins
2009-11-30 11:40 ` Hugh Dickins
2009-11-24 16:54 ` [PATCH 7/9] ksm: rmap_walk to remove_migation_ptes Hugh Dickins
2009-11-24 16:54 ` Hugh Dickins
2009-11-24 16:56 ` [PATCH 8/9] ksm: memory hotremove migration only Hugh Dickins
2009-11-24 16:56 ` Hugh Dickins
2009-11-24 16:57 ` [PATCH 9/9] ksm: remove unswappable max_kernel_pages Hugh Dickins
2009-11-24 16:57 ` Hugh Dickins
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