From: Rik van Riel <riel@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
Ingo Molnar <mingo@kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>,
Mel Gorman <mel@csn.ul.ie>,
Linux kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: question on NUMA page migration
Date: Fri, 19 Oct 2012 14:33:17 -0400 [thread overview]
Message-ID: <50819CED.30803@redhat.com> (raw)
In-Reply-To: <1350669236.2768.66.camel@twins>
On 10/19/2012 01:53 PM, Peter Zijlstra wrote:
> On Fri, 2012-10-19 at 13:13 -0400, Rik van Riel wrote:
>> Another alternative might be to do the put_page inside
>> do_prot_none_numa(). That would be analogous to do_wp_page
>> disposing of the old page for the caller.
>
> It'd have to be inside migrate_misplaced_page(), can't do before
> isolate_lru_page() or the page might disappear. Doing it after is
> (obviously) too late.
Keeping an extra refcount on the page might _still_
result in it disappearing from the process by some
other means, in-between you grabbing the refcount
and invoking migration of the page.
>> I am not real happy about NUMA migration introducing its own
>> migration mode...
>
> You didn't seem to mind too much earlier, but I can remove it if you
> want.
Could have been reviewing fatigue :)
And yes, it would have been nice to not have a special
migration mode for sched/numa.
Speaking of, when do you guys plan to submit a (cleaned up)
version of the sched/numa patch series for review on lkml?
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next prev parent reply other threads:[~2012-10-19 18:33 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-19 15:53 question on NUMA page migration Rik van Riel
2012-10-19 16:39 ` Peter Zijlstra
2012-10-19 17:13 ` Rik van Riel
2012-10-19 17:53 ` Peter Zijlstra
2012-10-19 18:33 ` Rik van Riel [this message]
2012-10-20 1:23 ` Ingo Molnar
2012-10-20 16:02 ` Rik van Riel
2012-10-21 12:30 ` Ingo Molnar
2012-10-21 2:39 ` Ni zhan Chen
2012-10-21 2:40 ` Rik van Riel
2012-10-21 12:31 ` Ingo Molnar
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