linux-kernel - Re: [RFC PATCH] mm: numa: adjust hinting fault record if page is migrated

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Message-ID: <CAJd=RBDhm5ZAQdi4K+JK3FZ-=jaNz6peyLtSxMrBGcGmKX=6qw@mail.gmail.com>
Date:	Sun, 15 Sep 2013 09:11:24 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	dhillf@...a.com, Mel Gorman <mgorman@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [RFC PATCH] mm: numa: adjust hinting fault record if page is migrated

Hello Rik

On Sat, Sep 14, 2013 at 11:55 PM, Rik van Riel <riel@...hat.com> wrote:
> On 09/14/2013 07:53 AM, Hillf Danton wrote:
>> After page A on source node is migrated to page B on target node, hinting
>> fault is recorded on the target node for B. On the source node there is
>> another record for A, since a two-stage filter is used when migrating pages.
>>
>> Page A is no longer used after migration, so we have to erase its record.
>
> What kind of performance changes have you observed with this patch?
>
> What benchmarks have you run, and on what kind of systems?
>
Due to no NUMA box, I can not answer you now.
I will try best to borrow one next Monday.

Thanks
Hillf
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