From: Peter Zijlstra <peterz@infradead.org>
To: Minchan Kim <minchan@kernel.org>
Cc: 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>,
Christoph Lameter <cl@linux-foundation.org>,
"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 11:20:26 +0200 [thread overview]
Message-ID: <1336728026.1017.7.camel@twins> (raw)
In-Reply-To: <4FAC9786.9060200@kernel.org>
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.
Are you saying compaction doesn't actually move mlocked pages? I'm
somewhat surprised by that, I've always assumed it would.
Its sad that mlock() doesn't take a flags argument, so I'd rather
introduce a new madvise() flag for -rt, something like MADV_UNMOVABLE
(or whatever) which will basically copy the pages to an un-movable page
block and really pin the things.
That way mlock() can stay what the spec says it is and guarantee
residency.
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next prev parent reply other threads:[~2012-05-11 9:20 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-11 4:37 Allow migration of mlocked page? Minchan Kim
2012-05-11 9:20 ` Peter Zijlstra [this message]
2012-05-11 16:20 ` Christoph Lameter
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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