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

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Date:	Tue, 2 Jun 2009 16:14:16 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"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 Tue, Jun 02, 2009 at 10:10:31PM +0800, Wu Fengguang wrote:
> On Tue, Jun 02, 2009 at 10:08:30PM +0800, Andi Kleen wrote:
> > > > > We could probably call truncate_complete_page(), but then
> > > > > we would also need to duplicate most of the checking outside
> > > > > the function anyways and there wouldn't be any possibility
> > > > > to share the clean/dirty variants. If you insist I can
> > > > > do it, but I think it would be significantly worse code
> > > > > than before and I'm reluctant to do that.
> > > > 
> > > > I can write you the patch for that too if you like.
> > > 
> > > I have already posted one on truncate_complete_page(). Not the way you want it?
> > 
> > Sorry I must have missed it (too much mail I guess). Can you repost please?
> 
> OK, here it is, a more simplified one.

I prefer mine because I don't want truncate_complete_page escaping
mm/truncate.c because the caller has to deal with truncate races.


> ---
>  mm/memory-failure.c |   13 +++----------
>  1 file changed, 3 insertions(+), 10 deletions(-)
> 
> --- sound-2.6.orig/mm/memory-failure.c
> +++ sound-2.6/mm/memory-failure.c
> @@ -324,23 +324,16 @@ static int me_free(struct page *p)
>   */
>  static int me_pagecache_clean(struct page *p)
>  {
> +	if (page_mapping(p))
> +                truncate_complete_page(p->mapping, p);
> +
>  	if (!isolate_lru_page(p))
>  		page_cache_release(p);
>  
> -	if (page_has_private(p))
> -		do_invalidatepage(p, 0);
>  	if (page_has_private(p) && !try_to_release_page(p, GFP_NOIO))
>  		Dprintk(KERN_ERR "MCE %#lx: failed to release buffers\n",
>  			page_to_pfn(p));
>  
> -	/*
> -	 * remove_from_page_cache assumes (mapping && !mapped)
> -	 */
> -	if (page_mapping(p) && !page_mapped(p)) {
> -		remove_from_page_cache(p);
> -		page_cache_release(p);
> -	}
> -
>  	return RECOVERED;
>  }

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