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

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Date:	Sat, 19 Jun 2010 15:20:55 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Michael Kerrisk <mtk.manpages@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>, 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

On Sat, Jun 19, 2010 at 02:36:28PM +0200, Michael Kerrisk wrote:
> Hi Andi,
> 
> On Tue, Dec 8, 2009 at 11:16 PM, Andi Kleen <andi@...stfloor.org> wrote:
> >
> > Process based injection is much easier to handle for test programs,
> > who can first bring a page into a specific state and then test.
> > So add a new MADV_SOFT_OFFLINE to soft offline a page, similar
> > to the existing hard offline injector.
> 
> I see that this made its way into 2.6.33. Could you write a short
> piece on it for the madvise.2 man page?

Also fixed the previous snippet slightly.


commit edb43354f0ffc04bf4f23f01261f9ea9f43e0d3d
Author: Andi Kleen <ak@...ux.intel.com>
Date:   Sat Jun 19 15:19:28 2010 +0200

    MADV_SOFT_OFFLINE
    
    Signed-off-by: Andi Kleen <ak@...ux.intel.com>

diff --git a/man2/madvise.2 b/man2/madvise.2
index db29feb..9dccd97 100644
--- a/man2/madvise.2
+++ b/man2/madvise.2
@@ -154,7 +154,15 @@ processes.
 This operation may result in the calling process receiving a
 .B SIGBUS
 and the page being unmapped.
-This feature is intended for memory testing.
+This feature is intended for testing of memory error handling code.
+This feature is only available if the kernel was configured with
+.BR CONFIG_MEMORY_FAILURE .
+.TP
+.BR MADV_SOFT_OFFLINE " (Since Linux 2.6.33)
+Soft offline a page. This will result in the memory of the page
+being copied to a new page and original page be offlined. The operation
+should be transparent to the calling process.
+This feature is intended for testing of memory error handling code.
 This feature is only available if the kernel was configured with
 .BR CONFIG_MEMORY_FAILURE .
 .TP

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