linux-kernel - Re: [PATCH v3 18/21] mm: add to lruvec isolated pages counters

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Date:	Fri, 24 Feb 2012 09:32:33 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Hugh Dickins <hughd@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH v3 18/21] mm: add to lruvec isolated pages counters

Konstantin Khlebnikov wrote:
> @@ -2480,8 +2494,11 @@ static int mem_cgroup_move_parent(struct page *page,
>
>          if (nr_pages>  1)
>                  compound_unlock_irqrestore(page, flags);
> +       if (!ret)
> +               /* This also stabilize PageLRU() sign for lruvec lock holder. */
> +               mem_cgroup_adjust_isolated(lruvec, page, -nr_pages);
>   put_back:
> -       putback_lru_page(page);
> +       __putback_lru_page(page, !ret);
>   put:
>          put_page(page);
>   out:

Oh, no. There must be !!ret

--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2482,7 +2482,7 @@ static int mem_cgroup_move_parent(struct page *page,
                 /* This also stabilize PageLRU() sign for lruvec lock holder. */
                 mem_cgroup_adjust_isolated(lruvec, page, -nr_pages);
  put_back:
-       __putback_lru_page(page, !ret);
+       __putback_lru_page(page, !!ret);
  put:
         put_page(page);
  out:
--
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