From: Peter Zijlstra <peterz@infradead.org>
To: Mel Gorman <mgorman@suse.de>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
Minchan Kim <minchan@kernel.org>,
Johannes Weiner <hannes@cmpxchg.org>,
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: Mon, 14 May 2012 16:08:57 +0200 [thread overview]
Message-ID: <1337004537.2443.43.camel@twins> (raw)
In-Reply-To: <1337003515.2443.35.camel@twins>
Anyway, afaict there's only two options:
1) make mlock() mean physically pinned (which we've so far always
rejected and isn't supported by whatever passes as a std for unix -- at
least not by the precise wording).
2) keep mlock() to mean no major fault.
I strongly prefer 2 -- its what we've always said.
This might mean there's a need for a stronger API -- one that also
guarantees physically pinned. This is a more expensive
resource/operation. It means we need to migrate all memory to UNMOVABLE
blocks, possibly growing the number of such blocks with all the
down-sides that has.
Alternatively -- in case we pick 1 -- we should create a weaker variant
that does what mlock means now in order to allow people to not pressure
the system unduly.
I don't see any other way.. the current constraints really are mutually
exclusive.
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next prev parent reply other threads:[~2012-05-14 14:09 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
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 [this message]
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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