Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756591AbZIVOc2 (ORCPT ); Tue, 22 Sep 2009 10:32:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754996AbZIVOc1 (ORCPT ); Tue, 22 Sep 2009 10:32:27 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:57956 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753559AbZIVOc1 (ORCPT ); Tue, 22 Sep 2009 10:32:27 -0400 Date: Tue, 22 Sep 2009 16:32:23 +0200 From: Ingo Molnar To: Avi Kivity , Peter Zijlstra Cc: "H. Peter Anvin" , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Marcelo Tosatti Subject: Re: [PATCH v2] core, x86: Add user return notifiers Message-ID: <20090922143223.GA31702@elte.hu> References: <4AB3CDEC.5050902@zytor.com> <1253342422-13811-1-git-send-email-avi@redhat.com> <4AB8980D.5070803@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4AB8980D.5070803@redhat.com> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.5 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 738 Lines: 21 * Avi Kivity wrote: > On 09/19/2009 09:40 AM, Avi Kivity wrote: >> Add a general per-cpu notifier that is called whenever the kernel is >> about to return to userspace. The notifier uses a thread_info flag >> and existing checks, so there is no impact on user return or context >> switch fast paths. >> > > Ingo/Peter? Would be nice to convert some existing open-coded return-to-user-space logic to this facility. One such candidate would be lockdep_sys_exit? Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/