linux-kernel - Re: [PATCH] mm: migrate: Check page_count of THP before migrating accounting fix

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Message-ID: <alpine.LNX.2.00.1301091120580.4818@eggly.anvils>
Date:	Wed, 9 Jan 2013 11:26:59 -0800 (PST)
From:	Hugh Dickins <hughd@...gle.com>
To:	Mel Gorman <mgorman@...e.de>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: migrate: Check page_count of THP before migrating
 accounting fix

On Wed, 9 Jan 2013, Mel Gorman wrote:

> As pointed out by Hugh Dickins, "mm: migrate: Check page_count of THP
> before migrating" can leave nr_isolated_anon elevated, correct it. This
> is a fix to mm-migrate-check-page_count-of-thp-before-migrating.patch
> 
> Signed-off-by: Mel Gorman <mgorman@...e.de>

Thanks: to this and the one it's fixing (I expect akpm will merge)

Acked-by: Hugh Dickins <hughd@...gle.com>

> ---
>  mm/migrate.c |    5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/mm/migrate.c b/mm/migrate.c
> index f466827..c387786 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -1689,8 +1689,11 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
>  	if (!isolated || page_count(page) != 2) {
>  		count_vm_events(PGMIGRATE_FAIL, HPAGE_PMD_NR);
>  		put_page(new_page);
> -		if (isolated)
> +		if (isolated) {
>  			putback_lru_page(page);
> +			isolated = 0;
> +			goto out;
> +		}
>  		goto out_keep_locked;
>  	}
--
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