Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756060Ab3IOL2V (ORCPT ); Sun, 15 Sep 2013 07:28:21 -0400 Received: from e23smtp08.au.ibm.com ([202.81.31.141]:47589 "EHLO e23smtp08.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755320Ab3IOL2T (ORCPT ); Sun, 15 Sep 2013 07:28:19 -0400 Message-ID: <523599C2.6020204@linux.vnet.ibm.com> Date: Sun, 15 Sep 2013 16:58:02 +0530 From: Hemant User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130625 Thunderbird/17.0.7 MIME-Version: 1.0 To: Masami Hiramatsu CC: Namhyung Kim , linux-kernel@vger.kernel.org, srikar@linux.vnet.ibm.com, peterz@infradead.org, oleg@redhat.com, mingo@redhat.com, anton@redhat.com, systemtap@sourceware.org Subject: Re: [PATCH 1/2] SDT markers listing by perf References: <20130903072944.4793.93584.stgit@hemant-fedora> <20130903073655.4793.20013.stgit@hemant-fedora> <87ioyht7e4.fsf@sejong.aot.lge.com> <5226E8F4.5060505@hitachi.com> In-Reply-To: <5226E8F4.5060505@hitachi.com> Content-Type: text/plain; charset=ISO-2022-JP Content-Transfer-Encoding: 7bit X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13091511-5140-0000-0000-000003D519CB Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2393 Lines: 67 Hi Masami, On 09/04/2013 01:31 PM, Masami Hiramatsu wrote: > (2013/09/04 15:42), Namhyung Kim wrote: >> On Tue, 03 Sep 2013 13:06:55 +0530, Hemant Kumar wrote: >> >> [SNIP] >> >>> diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c >>> index e8a66f9..3d8dcdf 100644 >>> --- a/tools/perf/builtin-probe.c >>> +++ b/tools/perf/builtin-probe.c >>> @@ -55,6 +55,7 @@ static struct { >>> bool show_funcs; >>> bool mod_events; >>> bool uprobes; >>> + bool sdt; >>> int nevents; >>> struct perf_probe_event events[MAX_PROBES]; >>> struct strlist *dellist; >>> @@ -325,6 +326,8 @@ int cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused) >>> opt_set_filter), >>> OPT_CALLBACK('x', "exec", NULL, "executable|path", >>> "target executable name or path", opt_set_target), >>> + OPT_BOOLEAN('S', "sdt", ¶ms.sdt, >>> + "Show and probe on the SDT markers"), >> You need to add it to Documentation/perf-probe.txt too. In addition if >> the --sdt option is only able to work with libelf, it should be wrapped >> into the #ifdef LIBELF_SUPPORT pair. >> >> And I'm not sure that it's a good idea to have two behavior on a single >> option (S) - show and probe (add). Maybe it can be separated into two >> or the S option can be used as a flag with existing --list and --add >> option? >> > Good catch! :) > No, that is really bad idea. All probes must be added by "--add" action. > So we need a new probe syntax for specifying sdt marker. > > How about the below syntax? > > [EVENT=]%PROVIDER:MARKER [ARG ...] > > Of course, this will require to list up all markers with "%" prefix for > continuity. > > And since --list option is to list up all existing(defined) probe events, > I think --markers (as like as --funcs) is better for listing it up. > > Thank you! > I have one doubt here. Why do we need [ARG ...] in the syntax you specified? I believe these args are to fetched from the sdt notes' section of the elf of the executable/library. Or am I taking this in a wrong way and this suggested syntax is actually for the uprobe_events file in the tracing directory? -- Thanks Hemant -- 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/