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SubjectRe: [PATCH v2 09/15] perf ftrace: add support for tracing option 'func_stack_trace'
On Fri, Jul 03, 2020 at 03:30:32PM +0900, Namhyung Kim wrote:
> On Sat, Jun 27, 2020 at 10:38 PM Changbin Du <changbin.du@gmail.com> wrote:
> >
> > This adds support to display call trace for function tracer. To do this,
> > just specify a '--func-call-graph' option.
>
> What if it's used with -G option? Also it might be used only with
> the -T option.. How about showing a warning if it's missing.. ?
>
All '--func-xxx' options are function tracer only. The warning message is a
good idea.

> Thanks
> Namhyung
>
> >
> > $ sudo perf ftrace -T vfs_read --func-call-graph
> > iio-sensor-prox-855 [003] 6168.369657: vfs_read <-ksys_read
> > iio-sensor-prox-855 [003] 6168.369677: <stack trace>
> > => vfs_read
> > => ksys_read
> > => __x64_sys_read
> > => do_syscall_64
> > => entry_SYSCALL_64_after_hwframe
> > ...
> >
> > Signed-off-by: Changbin Du <changbin.du@gmail.com>

--
Cheers,
Changbin Du

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