From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754710Ab1K1UKT (ORCPT ); Mon, 28 Nov 2011 15:10:19 -0500 Received: from casper.infradead.org ([85.118.1.10]:60067 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751159Ab1K1UKR convert rfc822-to-8bit (ORCPT ); Mon, 28 Nov 2011 15:10:17 -0500 Message-ID: <1322511002.2921.171.camel@twins> Subject: Re: [PATCH 7/9] ftrace, perf: Add support to use function tracepoint in perf From: Peter Zijlstra To: Steven Rostedt Cc: Jiri Olsa , fweisbec@gmail.com, mingo@redhat.com, paulus@samba.org, acme@ghostprotocols.net, linux-kernel@vger.kernel.org Date: Mon, 28 Nov 2011 21:10:02 +0100 In-Reply-To: <1322510931.2921.170.camel@twins> References: <1322417074-5834-1-git-send-email-jolsa@redhat.com> <1322417074-5834-8-git-send-email-jolsa@redhat.com> <1322510318.17003.14.camel@frodo> <1322510931.2921.170.camel@twins> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT X-Mailer: Evolution 3.2.1- Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2011-11-28 at 21:08 +0100, Peter Zijlstra wrote: > > Is it really an issue that we shouldn't call the full blown register > > instead? I'm not really understanding why this is a problem. Note, one > > of the improvements to ftrace in the near future is to enable ftrace > > without stop_machine. > > Yeah, but still not something you want to do during context switches, > right? Also, that's x86, there's still archs that need stop_machine(), right?