linux-kernel - Re: [PATCH v5 4/8] sched/numa: fix set cpupid on page migration twice against normal page

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Date:	Wed, 11 Dec 2013 09:01:24 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>, Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v5 4/8] sched/numa: fix set cpupid on page migration
 twice against normal page

On Wed, Dec 11, 2013 at 08:49:57AM +0800, Wanpeng Li wrote:
> commit 7851a45cd3 (mm: numa: Copy cpupid on page migration) copy over
> the cpupid at page migration time, there is unnecessary to set it again
> in function alloc_misplaced_dst_page, this patch fix it.
> 
> Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>

migratepages aops is not necessarily required to go through migrate_page_copy
but in practice all of them do and it's hard to imagine one that didn't
so.

Acked-by: Mel Gorman <mgorman@...e.de>

-- 
Mel Gorman
SUSE Labs
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