From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from d01relay04.pok.ibm.com (d01relay04.pok.ibm.com [9.56.227.236]) by e5.ny.us.ibm.com (8.13.8/8.13.8) with ESMTP id m9DGhlX0002245 for ; Mon, 13 Oct 2008 12:43:47 -0400 Received: from d01av03.pok.ibm.com (d01av03.pok.ibm.com [9.56.224.217]) by d01relay04.pok.ibm.com (8.13.8/8.13.8/NCO v9.1) with ESMTP id m9DGhlpC202236 for ; Mon, 13 Oct 2008 12:43:47 -0400 Received: from d01av03.pok.ibm.com (loopback [127.0.0.1]) by d01av03.pok.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id m9DGhkbf025321 for ; Mon, 13 Oct 2008 12:43:47 -0400 Subject: Re: [RFC v6][PATCH 0/9] Kernel based checkpoint/restart From: Dave Hansen In-Reply-To: <48F30315.1070909@fr.ibm.com> References: <1223461197-11513-1-git-send-email-orenl@cs.columbia.edu> <20081009124658.GE2952@elte.hu> <1223557122.11830.14.camel@nimitz> <20081009131701.GA21112@elte.hu> <1223559246.11830.23.camel@nimitz> <20081009134415.GA12135@elte.hu> <1223571036.11830.32.camel@nimitz> <20081010153951.GD28977@elte.hu> <48F30315.1070909@fr.ibm.com> Content-Type: text/plain Date: Mon, 13 Oct 2008 09:43:43 -0700 Message-Id: <1223916223.29877.14.camel@nimitz> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Cedric Le Goater Cc: Ingo Molnar , jeremy@goop.org, arnd@arndb.de, containers@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Alexander Viro , "H. Peter Anvin" , Thomas Gleixner , Andrey Mirkin List-ID: On Mon, 2008-10-13 at 10:13 +0200, Cedric Le Goater wrote: > hmm, that's rather complex, because we have to take into account the > kernel stack, no ? This is what Andrey was trying to solve in his patchset > back in September : > > http://lkml.org/lkml/2008/9/3/96 > > the restart phase simulates a clone and switch_to to (not) restore the kernel > stack. right ? Do we ever have to worry about the kernel stack if we simply say that tasks have to be *in* userspace when we checkpoint them. If a task is in an uninterruptable wait state, I'm not sure it's safe to checkpoint it anyway. -- Dave -- 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