linux-kernel - Re: [PATCH] [13/16] HWPOISON: The high level memory error handler in the VM v5

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Message-ID: <20090604092634.GW1065@one.firstfloor.org>
Date:	Thu, 4 Jun 2009 11:26:34 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"hugh.dickins@...cali.co.uk" <hugh.dickins@...cali.co.uk>,
	"npiggin@...e.de" <npiggin@...e.de>,
	"riel@...hat.com" <riel@...hat.com>,
	"chris.mason@...cle.com" <chris.mason@...cle.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"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 v5

On Thu, Jun 04, 2009 at 05:07:37PM +0800, Wu Fengguang wrote:
> 
> > > > +        * need this to decide if we should kill or just drop the page.
> > > > +        */
> > > > +       mapping = page_mapping(p);
> > > > +       if (!PageDirty(p) && !PageAnon(p) && !PageSwapBacked(p) &&
> > > 
> > > !PageAnon(p) could be removed: the below non-zero mapping check will
> > > do the work implicitly.
> > 
> > You mean !page_mapped?  Ok.
> 
> I mean to do
>                 mapping = page_mapping(p);
>                 if (!PageDirty(p) && !PageSwapBacked(p) && 
>                     mapping && mapping_cap_account_dirty(mapping)) {
> 
> Because for anonymous pages, page_mapping == NULL.

I realized this after pressing send. Anyways the PageAnon is dropped
> 
> --- sound-2.6.orig/mm/memory-failure.c
> +++ sound-2.6/mm/memory-failure.c
> @@ -660,6 +660,10 @@ static void hwpoison_user_mappings(struc
>  			break;
>  		pr_debug("MCE %#lx: try_to_unmap retry needed %d\n", pfn,  ret);
>  	}
> +	if (ret != SWAP_SUCCESS)
> +		printk(KERN_ERR
> +		       "MCE %#lx: failed to unmap page (mapcount=%d)!\n",
> +		       pfn, page_mapcount(p));

Ok.

-Andi

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