From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=35650 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PKmV7-0004Ya-38 for qemu-devel@nongnu.org; Tue, 23 Nov 2010 01:37:24 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1PKmT9-0000AR-Ot for qemu-devel@nongnu.org; Tue, 23 Nov 2010 01:37:12 -0500 Received: from mx1.redhat.com ([209.132.183.28]:24586) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1PKmT9-0000A2-I2 for qemu-devel@nongnu.org; Tue, 23 Nov 2010 01:35:11 -0500 Message-ID: <4CEB6097.2030203@redhat.com> Date: Tue, 23 Nov 2010 08:35:03 +0200 From: Avi Kivity MIME-Version: 1.0 Subject: Re: [Qemu-devel] Re: [PATCH] qemu-kvm: introduce cpu_start/cpu_stop commands References: <1290466818-5230-1-git-send-email-aliguori@us.ibm.com> <20101122230405.GB10050@sequoia.sous-sol.org> In-Reply-To: <20101122230405.GB10050@sequoia.sous-sol.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Chris Wright Cc: Anthony Liguori , qemu-devel@nongnu.org, kvm@vger.kernel.org On 11/23/2010 01:04 AM, Chris Wright wrote: > * Anthony Liguori (aliguori@us.ibm.com) wrote: > > qemu-kvm vcpu threads don't response to SIGSTOP/SIGCONT. Instead of teaching > > them to respond to these signals, introduce monitor commands that stop and start > > individual vcpus. > > In the past SIGSTOP has introduced time skew. Have you verified this > isn't an issue. Wouldn't we have the same problems with kernel cpu limits? I'd say it only depends on the period of the controller, not on how it's implemented. -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain.