linux-kernel - Re: [PATCH] mm: do not use page

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Message-ID: <20120611144132.GT3094@redhat.com>
Date:	Mon, 11 Jun 2012 16:41:32 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...e.cz>
Subject: Re: [PATCH] mm: do not use page_count without a page pin

Hi Minchan,

On Mon, Jun 11, 2012 at 10:30:43PM +0900, Minchan Kim wrote:
> AFAIUC, you mean we have to increase reference count of head page?
> If so, it's not in __count_immobile_pages because it is already race-likely function
> so it shouldn't be critical although race happens.

I meant, shouldn't we take into account the full size? If it's in the
lru the whole thing can be moved away.

  if (!PageLRU(page)) {
     nr_pages = hpage_nr_pages(page);
     barrier();
     found += nr_pages;
     iter += nr_pages-1;
  }
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