Re: [PATCH] perf/core: allow ftrace for functions in kernel/event/core.c

[KP Singh]

On Wed, Oct 13, 2021 at 5:47 PM Song Liu <songliubraving@xxxxxx> wrote:
>
>
>
> > On Oct 12, 2021, at 5:42 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> >
> > On Wed, Oct 06, 2021 at 02:07:32PM -0700, Song Liu wrote:
> >> It is useful to trace functions in kernel/event/core.c. Allow ftrace for
> >> them by removing $(CC_FLAGS_FTRACE) from Makefile.
> >>
> >> ---
> >> We had some discussions about this last year [1]. Seems that enabling
> >> ftrace in kernel/events won't really cause fatal recursion in the tests.
> >> Shall we give it another try?
> >
> > I suppose we can give it a go..
>
> Yes, please. :-) Shall we ship it with 5.16?

This would be super useful for us, perf_event_* functions are very nicely placed
for tracing events like mmap.

>
> Thanks,
> Song
>
>