From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail190.messagelabs.com (mail190.messagelabs.com [216.82.249.51]) by kanga.kvack.org (Postfix) with ESMTP id C2F0A6B01B6 for ; Sat, 19 Jun 2010 09:21:00 -0400 (EDT) Date: Sat, 19 Jun 2010 15:20:55 +0200 From: Andi Kleen Subject: Re: [PATCH] [31/31] HWPOISON: Add a madvise() injector for soft page offlining Message-ID: <20100619132055.GK18946@basil.fritz.box> References: <200912081016.198135742@firstfloor.org> <20091208211647.9B032B151F@basil.firstfloor.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org To: Michael Kerrisk Cc: Andi Kleen , fengguang.wu@intel.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: 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 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 Date: Sat Jun 19 15:19:28 2010 +0200 MADV_SOFT_OFFLINE Signed-off-by: Andi Kleen 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org