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

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Message-ID: <20170427225439.079e26a7@gandalf.local.home>
Date:   Thu, 27 Apr 2017 22:54:39 -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 20:51:28 -0600
David Ahern <dsahern@...il.com> wrote:

> On 4/27/17 8:49 PM, Steven Rostedt wrote:
> > 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.  
> 
> 
> What's old is new again?
> 
> root@...ny-jessie4:~# uname -a
> Linux kenny-jessie4 4.11.0-rc8+ #258 SMP Thu Apr 27 08:36:06 PDT 2017
> x86_64 GNU/Linux
> 
> root@...ny-jessie4:~# perf list | grep syscalls
>   raw_syscalls:sys_enter                             [Tracepoint event]
>   raw_syscalls:sys_exit                              [Tracepoint event]
> 
> 
> Is an option needed to enable syscalls vs raw_syscalls?

Yep!

CONFIG_FTRACE_SYSCALLS=y

-- Steve