Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753898AbbFIULq (ORCPT ); Tue, 9 Jun 2015 16:11:46 -0400 Received: from mail.kernel.org ([198.145.29.136]:57626 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932447AbbFIULj (ORCPT ); Tue, 9 Jun 2015 16:11:39 -0400 Date: Tue, 9 Jun 2015 17:11:34 -0300 From: Arnaldo Carvalho de Melo To: Vince Weaver Cc: Steven Rostedt , David Ahern , linux-kernel@vger.kernel.org, Peter Zijlstra , Ingo Molnar , Stephane Eranian , Jiri Olsa Subject: Re: perf/ftrace: does PERF_EVENT_IOC_SET_FILTER serve any purpose? Message-ID: <20150609201134.GJ3136@kernel.org> References: <55773DA3.6070808@gmail.com> <20150609155506.3c7d5fc3@gandalf.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Url: http://acmel.wordpress.com User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1140 Lines: 30 Em Tue, Jun 09, 2015 at 04:07:01PM -0400, Vince Weaver escreveu: > On Tue, 9 Jun 2015, Steven Rostedt wrote: > > > What kernel are you using? You may need to update perf. > > > > We switched to a tracefs filesystem, but the old perf wont read any > > events if it's not located in debugfs. That is, it actually tested > > which filesystem the event files were mounted on, and if they didn't > > match the debugfs mount type, it ignored them. That was fixed recently. > > I am running 4.1-rc7 and was trying to use perf_4.0. > > If I use the kernel's version of perf it works. > > sigh. Indeed, its always a shame when that happens, I had a similar reaction when Steven told it was validating the filesystem type, completely unnecessary, has been there for a long time :-\ Date: Tue Jul 21 12:20:22 2009 -0400 perf_counter: Add tracepoint support to perf list, perf stat - Arnaldo -- 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/