From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754749AbZBXBVT (ORCPT ); Mon, 23 Feb 2009 20:21:19 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751339AbZBXBVG (ORCPT ); Mon, 23 Feb 2009 20:21:06 -0500 Received: from e37.co.us.ibm.com ([32.97.110.158]:36754 "EHLO e37.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751279AbZBXBVD (ORCPT ); Mon, 23 Feb 2009 20:21:03 -0500 Subject: Re: [RFC][PATCH 3/5] check files for checkpointability From: Dave Hansen To: "Serge E. Hallyn" Cc: containers , Ingo Molnar , Alexey Dobriyan , "linux-kernel@vger.kernel.org" In-Reply-To: <20090224011037.GB4797@us.ibm.com> References: <20090219182007.B4B47C1F@kernel> <20090219182009.1A3E8860@kernel> <20090223234911.GB2590@us.ibm.com> <1235435430.26788.212.camel@nimitz> <20090224011037.GB4797@us.ibm.com> Content-Type: text/plain Date: Mon, 23 Feb 2009 17:20:59 -0800 Message-Id: <1235438459.26788.222.camel@nimitz> Mime-Version: 1.0 X-Mailer: Evolution 2.22.3.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2009-02-23 at 19:10 -0600, Serge E. Hallyn wrote: > > This allows us to tell where and when we went wrong. Take a process > > that's been running for a month. After 5 days it did something random > > to keep it from being checkpointed. You're going to have forgotten all > > about it 25 days later. This gives us an opportunity to spit into dmesg > > or just plain log it. It also gives the app some ability to reflect and > > see what its uncheckpointable attributes are. > > Hmm. In that case, rather than refuse checkpoint, I prefer that we make > this a footnote in the /proc/$$/checkpointable output. Yeah, that's cool. If we were smart, we'd also get hooked into some of the ftrace output so that we have a real chance of logging these things and being able to go look at something about them down the line. -- Dave