Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753758Ab0A1EVo (ORCPT ); Wed, 27 Jan 2010 23:21:44 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752707Ab0A1EVn (ORCPT ); Wed, 27 Jan 2010 23:21:43 -0500 Received: from e5.ny.us.ibm.com ([32.97.182.145]:49990 "EHLO e5.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752631Ab0A1EVn (ORCPT ); Wed, 27 Jan 2010 23:21:43 -0500 Date: Thu, 28 Jan 2010 09:51:39 +0530 From: Ananth N Mavinakayanahalli To: Masami Hiramatsu Cc: Ingo Molnar , lkml , systemtap , DLE , Frederic Weisbecker , Jim Keniston , Mathieu Desnoyers , Steven Rostedt Subject: Re: [PATCH tracing/kprobes] kprobes: Disable booster when CONFIG_PREEMPT=y Message-ID: <20100128042139.GA29044@in.ibm.com> Reply-To: ananth@in.ibm.com References: <4B5E476C.9030303@redhat.com> <20100127215531.24775.26807.stgit@dhcp-100-2-132.bos.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100127215531.24775.26807.stgit@dhcp-100-2-132.bos.redhat.com> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 733 Lines: 16 On Wed, Jan 27, 2010 at 04:55:31PM -0500, Masami Hiramatsu wrote: > Disable kprobe booster when CONFIG_PREEMPT=y, because it can't ensure > that all kernel threads preempted on kprobe's boosted slot run out from > the slot even using freeze_processes(). > > The booster on preemptive kernel will be resumed if synchronize_tasks() > or something like that is introduced. > > Signed-off-by: Masami Hiramatsu Acked-by: Ananth N Mavinakayanahalli -- 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/