linux-kernel - Re: [PATCH 4/5] HWPOISON: report sticky EIO for poisoned file

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Message-ID: <20090612100716.GE25568@one.firstfloor.org>
Date:	Fri, 12 Jun 2009 12:07:16 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Nick Piggin <npiggin@...e.de>,
	Andi Kleen <andi@...stfloor.org>,
	"riel@...hat.com" <riel@...hat.com>,
	"chris.mason@...cle.com" <chris.mason@...cle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 4/5] HWPOISON: report sticky EIO for poisoned file

On Thu, Jun 11, 2009 at 10:22:43PM +0800, Wu Fengguang wrote:
> This makes the EIO reports on write(), fsync(), or the NFS close()
> sticky enough. The only way to get rid of it may be
> 
> 	echo 3 > /proc/sys/vm/drop_caches
> 
> Note that the impacted process will only be killed if it mapped the page.
> XXX
> via read()/write()/fsync() instead of memory mapped reads/writes, simply
> because it's very hard to find them.

I don't like the special case bit. Conceptually we shouldn't need
to handle hwpoison specially here; it's just like a standard error. 

It makes hwpoison look more intrusive than it really is :)

I think it would be better to simply make
the standard EIO sticky; that would fix a lot of other issues too (e.g.
better reporting of metadata errors) But that's something for post .31.

For .31 I think hwpoison can live fine with non sticky errors; it was
more a problem of the test suite anyways which we worked around.

So better drop this patch for now.

-Andi

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