linux-kernel - Re: [patch 3/9] Guest page hinting: volatile page cache.

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Message-Id: <1157133780.18728.6.camel@localhost.localdomain>
Date:	Fri, 01 Sep 2006 11:03:00 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	schwidefsky@...ibm.com
Cc:	Andy Whitcroft <apw@...dowen.org>, linux-kernel@...r.kernel.org,
	virtualization@...ts.osdl.org, akpm@...l.org,
	nickpiggin@...oo.com.au, frankeh@...son.ibm.com
Subject: Re: [patch 3/9] Guest page hinting: volatile page cache.

On Fri, 2006-09-01 at 19:42 +0200, Martin Schwidefsky wrote: 
> The problem of page discard vs. normal page remove is that the page can
> be remove and discarded at the same time. Both sides are writers in the
> sense that they want to remove the page from page cache. RCU doesn't not
> help with that kind of race. 

OK.  It comes down to a race between 

	__remove_from_page_cache()/__delete_from_swap_cache()

and

	__page_discard()

running on the same page at the same time.  Right?

-- Dave

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