linux-kernel - Re: [PATCH] [13/16] HWPOISON: The high level memory error handler in the VM v3

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Message-ID: <20090603112456.GA1065@one.firstfloor.org>
Date:	Wed, 3 Jun 2009 13:24:56 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	"hugh@...itas.com" <hugh@...itas.com>,
	"riel@...hat.com" <riel@...hat.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"chris.mason@...cle.com" <chris.mason@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH] [13/16] HWPOISON: The high level memory error handler in the VM v3

On Wed, Jun 03, 2009 at 11:35:46AM +0200, Nick Piggin wrote:
> On Tue, Jun 02, 2009 at 07:27:15PM +0200, Andi Kleen wrote:
> > > Hmm, if you're handling buffercache here then possibly yes.
> > 
> > Good question, will check.
> 
> BTW. now that I think about it, buffercache is probably not a good
> idea to truncate (truncate, as-in: remove from pagecache). Because
> filesystems can assume that with just a reference on the page, then
> it will not be truncated.

Yes I understand. Need to check for this, but I'm not sure
how we can reliably detect it based on the struct page alone. I guess we have 
to look at the mapping.

> So I think it would be a good idea to exclude buffercache from
> here completely until it can be shown to be safe. Actually you

Agreed. Just need to figure out how.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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