From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755406AbcI0Skj (ORCPT ); Tue, 27 Sep 2016 14:40:39 -0400 Received: from mail.kernel.org ([198.145.29.136]:41576 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754795AbcI0Skb (ORCPT ); Tue, 27 Sep 2016 14:40:31 -0400 Date: Tue, 27 Sep 2016 11:40:26 -0700 From: Masami Hiramatsu To: Arnaldo Carvalho de Melo Cc: wang@infradead.org, Jiri Olsa , David Ahern , Namhyung Kim , Linux Kernel Mailing List Subject: Re: using SDT events Message-Id: <20160927114026.eafeb5a2ea9a75ae52229bbe@kernel.org> In-Reply-To: <20160927135538.GN5588@kernel.org> References: <20160927135538.GN5588@kernel.org> X-Mailer: Sylpheed 3.5.0 (GTK+ 2.24.30; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 27 Sep 2016 10:55:38 -0300 Arnaldo Carvalho de Melo wrote: > Masami, > > Testing something else (event aliases/JSON) I saw the many sdt > events available via 'perf list', decided to use the usual workflow, > failed, what am I doing wrong? No, that is not supported yet. So I dropped perf-list support from the latest series... https://lkml.org/lkml/2016/7/1/133 The unresolved problems are - how we treat sdt events after recorded? remove or leave it as tracepoint? - what should be done if we found the tracepoint which has same name of the SDT. (we can not reserve tracepoint name beforehand) - Sometimes SDT name can be conflict, even on same binary. > > > [root@jouet ~]# perf list sdt_qemu:pci* > > List of pre-defined events (to be used in -e): > > sdt_qemu:pci_cfg_read [SDT event] > sdt_qemu:pci_cfg_write [SDT event] > sdt_qemu:pci_update_mappings_add [SDT event] > sdt_qemu:pci_update_mappings_del [SDT event] > [root@jouet ~]# perf record -e sdt_qemu:pci* -a > event syntax error: 'sdt_qemu:pci*' > \___ unknown tracepoint > > Error: File /sys/kernel/debug/tracing/events/sdt_qemu/pci* not found. > Hint: Perhaps this kernel misses some CONFIG_ setting to enable this > feature?. > > Run 'perf list' for a list of valid events > > Usage: perf record [] [] > or: perf record [] -- [] > > -e, --event event selector. use 'perf list' to list > available events > [root@jouet ~]# -- Masami Hiramatsu