linux-kernel - Re: [PATCH v2 3/6] mm/balloon_compaction: isolate balloon pages without lru

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Date:	Tue, 2 Sep 2014 08:32:40 -0400
From:	Rafael Aquini <aquini@...hat.com>
To:	Konstantin Khlebnikov <koct9i@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Konstantin Khlebnikov <k.khlebnikov@...sung.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>
Subject: Re: [PATCH v2 3/6] mm/balloon_compaction: isolate balloon pages
 without lru_lock

On Sat, Aug 30, 2014 at 08:41:17PM +0400, Konstantin Khlebnikov wrote:
> From: Konstantin Khlebnikov <k.khlebnikov@...sung.com>
> 
> LRU-lock isn't required for balloon page isolation. This check makes migration
> of some ballooned pages mostly impossible because isolate_migratepages_range()
> drops LRU lock periodically.
> 
> Signed-off-by: Konstantin Khlebnikov <k.khlebnikov@...sung.com>
> Cc: stable <stable@...r.kernel.org> # v3.8
> ---
>  mm/compaction.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/compaction.c b/mm/compaction.c
> index 73466e1..ad58f73 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -643,7 +643,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
>  		 */
>  		if (!PageLRU(page)) {
>  			if (unlikely(balloon_page_movable(page))) {
> -				if (locked && balloon_page_isolate(page)) {
> +				if (balloon_page_isolate(page)) {
>  					/* Successfully isolated */
>  					goto isolate_success;
>  				}
> 
Acked-by: Rafael Aquini <aquini@...hat.com>

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