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

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Date:   Thu, 27 Apr 2017 20:13:43 -0600
From:   David Ahern <dsahern@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        David Carrillo-Cisneros <davidcc@...gle.com>
Cc:     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 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.


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?