linux-kernel - Re: [PATCH 16/24] HWPOISON: limit hwpoison injector to known page types

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Message-ID: <20091202081102.GA16218@elte.hu>
Date:	Wed, 2 Dec 2009 09:11:02 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Haicheng Li <haicheng.li@...el.com>,
	Nick Piggin <npiggin@...e.de>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 16/24] HWPOISON: limit hwpoison injector to known page
 types


* Wu Fengguang <fengguang.wu@...el.com> wrote:

> --- linux-mm.orig/mm/hwpoison-inject.c	2009-11-30 20:44:41.000000000 +0800
> +++ linux-mm/mm/hwpoison-inject.c	2009-11-30 20:58:20.000000000 +0800
> @@ -3,16 +3,41 @@
>  #include <linux/debugfs.h>
>  #include <linux/kernel.h>
>  #include <linux/mm.h>
> +#include <linux/swap.h>
>  #include "internal.h"
>  
>  static struct dentry *hwpoison_dir;
>  
>  static int hwpoison_inject(void *data, u64 val)
>  {

i'd like to raise a continuing conceptual objection against the ad-hoc 
and specialistic nature of the event injection in the 
mm/memory-failure*.c code. It should probably be using a standardized 
interface by integrating with perf events - as i outlined it before.

Where needed perf events should be extended - we can help with that. 
There's no point in having scattered pieces of incompatible (and 
user-ABI affecting) infrastructure all around the kernel.

Thanks,

	Ingo

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