linux-kernel - Re: [RFC v3] Support volatile range for anon vma

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Message-ID: <20121211071742.GA26598@glandium.org>
Date:	Tue, 11 Dec 2012 08:17:42 +0100
From:	Mike Hommey <mh@...ndium.org>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Arun Sharma <asharma@...com>, sanjay@...gle.com,
	Paul Turner <pjt@...gle.com>,
	David Rientjes <rientjes@...gle.com>,
	John Stultz <john.stultz@...aro.org>,
	Christoph Lameter <cl@...ux.com>,
	Android Kernel Team <kernel-team@...roid.com>,
	Robert Love <rlove@...gle.com>, Mel Gorman <mel@....ul.ie>,
	Hugh Dickins <hughd@...gle.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Dave Chinner <david@...morbit.com>, Neil Brown <neilb@...e.de>,
	Taras Glek <tglek@...illa.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [RFC v3] Support volatile range for anon vma

On Tue, Dec 11, 2012 at 11:41:04AM +0900, Minchan Kim wrote:
> - What's the madvise(addr, length, MADV_VOLATILE)?
> 
>   It's a hint that user deliver to kernel so kernel can *discard*
>   pages in a range anytime.
> 
> - What happens if user access page(ie, virtual address) discarded
>   by kernel?
> 
>   The user can see zero-fill-on-demand pages as if madvise(DONTNEED).

What happened to getting SIGBUS?

Mike
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