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

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Message-ID: <A2707216-E8F3-4D91-87AF-6F09CA63415C@fb.com>
Date:   Wed, 13 Oct 2021 15:46:31 +0000
From:   Song Liu <songliubraving@...com>
To:     Peter Zijlstra <peterz@...radead.org>
CC:     "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>,
        KP Singh <kpsingh@...nel.org>
Subject: Re: [PATCH] perf/core: allow ftrace for functions in
 kernel/event/core.c



> 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?

Thanks,
Song