linux-kernel - Re: [PATCH] THP: Use explicit memory barrier

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Message-ID: <alpine.DEB.2.02.1304011634530.21603@chino.kir.corp.google.com>
Date:	Mon, 1 Apr 2013 16:35:38 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Minchan Kim <minchan@...nel.org>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Mel Gorman <mgorman@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH] THP: Use explicit memory barrier

On Mon, 1 Apr 2013, Minchan Kim wrote:

> __do_huge_pmd_anonymous_page depends on page_add_new_anon_rmap's
> spinlock for making sure that clear_huge_page write become visible
> after set set_pmd_at() write.
> 
> But lru_cache_add_lru uses pagevec so it could miss spinlock
> easily so above rule was broken so user may see inconsistent data.
> 
> This patch fixes it with using explict barrier rather than depending
> on lru spinlock.
> 

Is this the same issue that Andrea responded to in the "thp and memory 
barrier assumptions" thread at http://marc.info/?t=134333512700004 ?
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