linux-kernel - Re: [PATCH] [31/31] HWPOISON: Add a madvise() injector for soft page offlining

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Date:	Sat, 19 Jun 2010 16:17:24 +0200
From:	Michael Kerrisk <mtk.manpages@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	fengguang.wu@...el.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH] [31/31] HWPOISON: Add a madvise() injector for soft page 
	offlining

Hi Andi,

On Sat, Jun 19, 2010 at 4:09 PM, Andi Kleen <andi@...stfloor.org> wrote:
> On Sat, Jun 19, 2010 at 03:43:28PM +0200, Michael Kerrisk wrote:
>> Is there a userspace operation to unpoison (i.e., reverse MADV_SOFT_OFFLINE)?
>
> Yes, but it's only a debugfs interface currently.

Okay -- thanks.

>> I ask because I wondered if there is something additional to be documented.
>
> I don't think debugfs needs manpages atm.

Okay.

I edited your text somewhat. Could you please review the below.

Cheers,

Michael

.TP
.BR MADV_SOFT_OFFLINE " (Since Linux 2.6.33)
Soft offline the pages in the range specified by
.I addr
and
.IR length .
This memory of each page in the specified range is copied to a new page,
and the original page is offlined
(i.e., no longer used, and taken out of normal memory management).
The effect of the
.B MADV_SOFT_OFFLINE
operation is normally invisible to (i.e., does not change the semantics of)
the calling process.
This feature is intended for testing of memory error-handling code;
it is only available if the kernel was configured with
.BR CONFIG_MEMORY_FAILURE .
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