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Date: Tue, 11 Dec 2012 08:17:42 +0100
From: Mike Hommey <mh@glandium.org>
Subject: Re: [RFC v3] Support volatile range for anon vma
Message-ID: <20121211071742.GA26598@glandium.org>
References: <1355193255-7217-1-git-send-email-minchan@kernel.org>
 <20121211024104.GA10523@blaptop>
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To: Minchan Kim <minchan@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Michael Kerrisk <mtk.manpages@gmail.com>, Arun Sharma <asharma@fb.com>, sanjay@google.com, Paul Turner <pjt@google.com>, David Rientjes <rientjes@google.com>, John Stultz <john.stultz@linaro.org>, Christoph Lameter <cl@linux.com>, Android Kernel Team <kernel-team@android.com>, Robert Love <rlove@google.com>, Mel Gorman <mel@csn.ul.ie>, Hugh Dickins <hughd@google.com>, Dave Hansen <dave@linux.vnet.ibm.com>, Rik van Riel <riel@redhat.com>, Dave Chinner <david@fromorbit.com>, Neil Brown <neilb@suse.de>, Taras Glek <tglek@mozilla.com>, KOSAKI Motohiro <kosaki.motohiro@gmail.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

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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