linux-kernel - Re: [PATCH v1] mm: migrate: hugetlb: putback destination hugepage to active list

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Message-ID: <20150916025344.GA18550@hori1.linux.bs1.fc.nec.co.jp>
Date:	Wed, 16 Sep 2015 02:53:46 +0000
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Michal Hocko <mhocko@...e.cz>, Andi Kleen <andi@...stfloor.org>,
	"Hugh Dickins" <hughd@...gle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] mm: migrate: hugetlb: putback destination hugepage
 to active list

my bad, this patch is totally unrelated to the thread the previous email
replied to. I just mishandled my script wrapping git-send-email, sorry.

But just resending patch seems to be noisy, so I want this to be reviewed
on this email.
If it's inconvenient or uncommon way of submission, please let me know and
I'll resend in a new thread.

Thanks,
Naoya Horiguchi

On Wed, Sep 16, 2015 at 12:21:04AM +0000, Naoya Horiguchi wrote:
> Since commit bcc54222309c ("mm: hugetlb: introduce page_huge_active")
> each hugetlb page maintains its active flag to avoid a race condition between
> multiple calls of isolate_huge_page(), but current kernel doesn't set the flag
> on a hugepage allocated by migration because the proper putback routine isn't
> called. This means that users could still encounter the race referred to by
> bcc54222309c in this special case, so this patch fixes it.
> 
> Fixes: bcc54222309c ("mm: hugetlb: introduce page_huge_active")
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Cc: <stable@...r.kernel.org>  #4.1
> ---
>  mm/migrate.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git v4.3-rc1/mm/migrate.c v4.3-rc1_patched/mm/migrate.c
> index c3cb566af3e2..7452a00bbb50 100644
> --- v4.3-rc1/mm/migrate.c
> +++ v4.3-rc1_patched/mm/migrate.c
> @@ -1075,7 +1075,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
>  	if (rc != MIGRATEPAGE_SUCCESS && put_new_page)
>  		put_new_page(new_hpage, private);
>  	else
> -		put_page(new_hpage);
> +		putback_active_hugepage(new_hpage);
>  
>  	if (result) {
>  		if (rc)
> -- 
> 2.4.3
> 
> --
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