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

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Message-ID: <20090602134610.GO1065@one.firstfloor.org>
Date:	Tue, 2 Jun 2009 15:46:10 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Andi Kleen <andi@...stfloor.org>, hugh@...itas.com,
	riel@...hat.com, akpm@...ux-foundation.org, chris.mason@...cle.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	fengguang.wu@...el.com
Subject: Re: [PATCH] [13/16] HWPOISON: The high level memory error handler in the VM v3

On Tue, Jun 02, 2009 at 03:19:37PM +0200, Nick Piggin wrote:
> > I assume that if an application does something with EIO it 
> > can either retry a few times or give up. Both is ok here.
> 
> That's exactly the case where it is not OK, because the
> dirty page was now removed from pagecache, so the subsequent
> fsync is going to succeed and the app will think its dirty
> data has hit disk.

Ok that's a fair point -- that's a hole in my scheme. I don't
know of a good way to fix it though. Do you?

I suspect adding a new errno would break more cases than fixing
them.

-Andi

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