linux-kernel - Re: perf report warnings on tracepoint events hidden by ui

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Date:   Thu, 27 Apr 2017 22:49:14 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     David Ahern <dsahern@...il.com>
Cc:     David Carrillo-Cisneros <davidcc@...gle.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Andi Kleen <andi@...stfloor.org>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Wang Nan <wangnan0@...wei.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: perf report warnings on tracepoint events hidden by ui

On Thu, 27 Apr 2017 20:13:43 -0600
David Ahern <dsahern@...il.com> wrote:

> On 4/27/17 7:41 PM, Steven Rostedt wrote:
> > On Thu, 27 Apr 2017 19:31:12 -0500
> > David Carrillo-Cisneros <davidcc@...gle.com> wrote:
> >   
> >> When processing tracepoint events, perf report outputs warnings about
> >> field not founds. The warnings are usually hidden by perf report UI
> >> and appear when using the --stdio option. e.g.
> >>
> >>   $ perf record -e syscalls:sys_enter_mmap some_load  
> 
> '-e syscalls' vs raw_syscalls suggests an older kernel -- like RHEL6.

New kernels have both syscalls and raw_syscalls. The raw_syscalls are
the true tracepoints that the syscalls use. His option works on
4.11-rc8.

-- Steve


> 
> 
> See the note I put into tools/perf/builtin-trace.c:
> 
> static struct perf_evsel *perf_evsel__syscall_newtp(const char
> *direction, void *handler)
> {
>         struct perf_evsel *evsel = perf_evsel__newtp("raw_syscalls",
> direction);
> 
>         /* older kernel (e.g., RHEL6) use syscalls:{enter,exit} */
>         if (IS_ERR(evsel))
>                 evsel = perf_evsel__newtp("syscalls", direction);
> 
> 
> Are you running top of tree perf on RHEL6?