linux-kernel - Re: [PATCH v4 01/12] sched/numa: fix set cpupid on page migration twice against thp

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Message-ID: <1386707694-ag3197mb-mutt-n-horiguchi@ah.jp.nec.com>
Date:	Tue, 10 Dec 2013 15:34:54 -0500
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
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>,
	Mel Gorman <mgorman@...e.de>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v4 01/12] sched/numa: fix set cpupid on page migration
 twice against thp

On Tue, Dec 10, 2013 at 05:19:24PM +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 migrate_misplaced_transhuge_page, this patch fix it.
> 
> Acked-by: Mel Gorman <mgorman@...e.de>
> Reviewed-by: Rik van Riel <riel@...hat.com>
> Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>

Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>

> ---
>  mm/migrate.c |    2 --
>  1 files changed, 0 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/migrate.c b/mm/migrate.c
> index bb94004..fdb70f7 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -1736,8 +1736,6 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
>  	if (!new_page)
>  		goto out_fail;
>  
> -	page_cpupid_xchg_last(new_page, page_cpupid_last(page));
> -
>  	isolated = numamigrate_isolate_page(pgdat, page);
>  	if (!isolated) {
>  		put_page(new_page);
> -- 
> 1.7.7.6
> 
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