linux-kernel - Re: [PATCH] [6/16] HWPOISON: Add basic support for poisoned pages in fault handler v2

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Message-ID: <4A1F6166.4020006@hitachi.com>
Date:	Fri, 29 May 2009 13:15:34 +0900
From:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, fengguang.wu@...el.com,
	Satoshi OSHIMA <satoshi.oshima.fk@...achi.com>,
	Taketoshi Sakuraba <taketoshi.sakuraba.hc@...achi.com>
Subject: Re: [PATCH] [6/16] HWPOISON: Add basic support for poisoned pages in
    fault handler v2

Andi Kleen wrote:

> - Add a new VM_FAULT_HWPOISON error code to handle_mm_fault. Right now
> architectures have to explicitely enable poison page support, so
> this is forward compatible to all architectures. They only need
> to add it when they enable poison page support.
> - Add poison page handling in swap in fault code
> 
> v2: Add missing delayacct_clear_flag (Hidehiro Kawai)

[snip]

>  		goto out;
>  	}
>  	delayacct_set_flag(DELAYACCT_PF_SWAPIN);
> @@ -2484,6 +2492,10 @@
>  		/* Had to read the page from swap area: Major fault */
>  		ret = VM_FAULT_MAJOR;
>  		count_vm_event(PGMAJFAULT);
> +	} else if (PageHWPoison(page)) {
> +		ret = VM_FAULT_HWPOISON;
> +		delayacct_set_flag(DELAYACCT_PF_SWAPIN);
> +		goto out;

Is this delayacct_clear_flag()? :-p

Regards,
-- 
Hidehiro Kawai
Hitachi, Systems Development Laboratory
Linux Technology Center

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