From: Christoph Lameter <cl@linux.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Minchan Kim <minchan@kernel.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Mel Gorman <mgorman@suse.de>, Rik van Riel <riel@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
tglx@linutronix.de, Ingo Molnar <mingo@redhat.com>,
Theodore Ts'o <tytso@mit.edu>
Subject: Re: Allow migration of mlocked page?
Date: Fri, 11 May 2012 11:20:44 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1205111117380.31049@router.home> (raw)
In-Reply-To: <1336728026.1017.7.camel@twins>
On Fri, 11 May 2012, Peter Zijlstra wrote:
> On Fri, 2012-05-11 at 13:37 +0900, Minchan Kim wrote:
> > I hope hear opinion from rt guys, too.
>
> Its a problem yes, not sure your solution is any good though. As it
> stands mlock() simply doesn't guarantee no faults, all it does is
> guarantee no major faults.
There are two different way to lock pages down in memory that have
different counters in /proc/<pid>/status and also different semantics.
VmLck: Mlocked pages. This means there is a prohibition against evicting
pages. These pages can undergo page migration and therefore also be
handled by compation. These pages have PG_mlock set.
VmPin: Pinned pages. Page cannot be moved. These pages have an elevated
refcount that makes page migration fail.
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next prev parent reply other threads:[~2012-05-11 16:20 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-11 4:37 Minchan Kim
2012-05-11 9:20 ` Peter Zijlstra
2012-05-11 16:20 ` Christoph Lameter [this message]
2012-05-11 23:24 ` KOSAKI Motohiro
2012-05-14 13:45 ` Christoph Lameter
2012-05-14 4:13 ` Minchan Kim
2012-05-14 6:56 ` Peter Zijlstra
2012-05-14 7:37 ` Minchan Kim
2012-05-14 7:45 ` Peter Zijlstra
2012-05-14 7:49 ` Peter Zijlstra
2012-05-14 7:54 ` Minchan Kim
2012-05-14 13:47 ` Christoph Lameter
2012-05-15 1:23 ` Minchan Kim
2012-05-15 11:07 ` Peter Zijlstra
2012-05-11 13:14 ` Mel Gorman
2012-05-11 23:25 ` KOSAKI Motohiro
2012-05-14 13:32 ` Mel Gorman
2012-05-14 13:51 ` Peter Zijlstra
2012-05-14 14:01 ` Christoph Lameter
2012-05-14 14:14 ` Peter Zijlstra
2012-05-14 14:43 ` Christoph Lameter
2012-05-14 22:52 ` KOSAKI Motohiro
2012-05-14 23:04 ` Roland Dreier
2012-05-15 14:27 ` Christoph Lameter
2012-05-15 1:38 ` Minchan Kim
2012-05-14 14:08 ` Peter Zijlstra
2012-05-14 23:06 ` KOSAKI Motohiro
2012-05-15 1:35 ` Minchan Kim
2012-05-14 4:25 ` Minchan Kim
2012-05-14 13:39 ` Mel Gorman
2012-05-15 2:15 ` Minchan Kim
2012-05-15 4:33 ` KOSAKI Motohiro
2012-05-15 11:06 ` Peter Zijlstra
2012-05-15 14:12 ` Christoph Lameter
2012-05-15 14:45 ` Peter Zijlstra
2012-05-15 15:11 ` Christoph Lameter
2012-05-15 14:10 ` Christoph Lameter
2012-05-15 14:09 ` Christoph Lameter
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