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SubjectRe: perf report warnings on tracepoint events hidden by ui
On Thu, 27 Apr 2017 20:51:28 -0600
David Ahern <dsahern@gmail.com> wrote:

> On 4/27/17 8:49 PM, Steven Rostedt wrote:
> > On Thu, 27 Apr 2017 20:13:43 -0600
> > David Ahern <dsahern@gmail.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@google.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@kenny-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@kenny-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

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