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

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Date:   Wed, 13 Oct 2021 18:33:05 +0200
From:   KP Singh <kpsingh@...nel.org>
To:     Song Liu <songliubraving@...com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>,
        "acme@...nel.org" <acme@...nel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Andrii Nakryiko <andrii@...nel.org>
Subject: Re: [PATCH] perf/core: allow ftrace for functions in kernel/event/core.c

On Wed, Oct 13, 2021 at 5:47 PM Song Liu <songliubraving@...com> wrote:
>
>
>
> > On Oct 12, 2021, at 5:42 AM, Peter Zijlstra <peterz@...radead.org> 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
>
>