From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756532AbbI3KUW (ORCPT ); Wed, 30 Sep 2015 06:20:22 -0400 Received: from mga01.intel.com ([192.55.52.88]:14045 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751799AbbI3KUQ (ORCPT ); Wed, 30 Sep 2015 06:20:16 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.17,611,1437462000"; d="scan'208";a="816207641" From: Alexander Shishkin To: Mathieu Poirier , gregkh@linuxfoundation.org, a.p.zijlstra@chello.nl, acme@kernel.org, mingo@redhat.com, corbet@lwn.net Cc: adrian.hunter@intel.com, zhang.chunyan@linaro.org, mike.leach@arm.com, tor@ti.com, al.grant@arm.com, pawel.moll@arm.com, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH 00/20] Coresight integration with perf In-Reply-To: <1442593594-10665-1-git-send-email-mathieu.poirier@linaro.org> References: <1442593594-10665-1-git-send-email-mathieu.poirier@linaro.org> User-Agent: Notmuch/0.20.2 (http://notmuchmail.org) Emacs/24.5.1 (x86_64-pc-linux-gnu) Date: Wed, 30 Sep 2015 13:18:03 +0300 Message-ID: <87k2r8jjms.fsf@ashishki-desk.ger.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Mathieu Poirier writes: > This patchset aims to integrate configuration and control of > the Coresight tracers with the perf sub-system. > > The goal is to use PMUs to represent tracers and the auxiliary > buffer enhancement to collect processor traces. As such a lot > of work is done to move the current Coresight sysFS oriented > configuration and control commands to perf's AUX API. Another general question: is there anything that prevents a sysfs user from changing ETM/ETB configuration while it's used by a perf event? I couldn't find any code in this patchset that would implement such exclusivity. Thanks, -- Alex