From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: PATCH [0/4] perf: clean-up of power events API Date: Fri, 08 Oct 2010 10:14:40 +0200 Message-ID: <4CAED2F0.9080801@kernel.org> References: <1286205661-24448-1-git-send-email-jean.pihet@newoldbits.com> <201010062334.46971.trenn@suse.de> <20101007150825.GB12581@Krystal> <20101007155816.GA5351@nowhere> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from hera.kernel.org ([140.211.167.34]:45141 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755774Ab0JHIQM (ORCPT ); Fri, 8 Oct 2010 04:16:12 -0400 In-Reply-To: <20101007155816.GA5351@nowhere> Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Frederic Weisbecker Cc: Pierre Tardy , Mathieu Desnoyers , Thomas Renninger , Jean Pihet , linux-trace-users@vger.kernel.org, linux-pm@lists.linux-foundation.org, linux-perf-users@vger.kernel.org, mingo@elte.hu, arjan@linux.intel.com, rjw@sisk.pl, linux-omap@vger.kernel.org, Peter Zijlstra , Kevin Hilman , Steven Rostedt , Frank Eigler , Masami Hiramatsu , Thomas Gleixner , Andrew Morton , Linus Torvalds Hello, On 10/07/2010 05:58 PM, Frederic Weisbecker wrote: > I really feel uncomfortable with this tracepoint/ABI problem.... > Mathieu suggested we start a user library that could handle these > changes when they are really necessary. > > Thoughts? > > (Adding Tejun in Cc). Given that tracepoints are supposed to make internal operation visible. I don't think it's a good idea to make it part of fixed ABI. Maybe some core part can be put in stone but I think things like internal workqueue implementation should be changeable without worrying about ABI issues. Thanks. -- tejun