linux-kernel - Re: [PATCH 0/4] ftrace: Add 'function-fork' trace option (v1)

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Date:   Thu, 30 Mar 2017 09:54:42 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, kernel-team@....com
Subject: Re: [PATCH 0/4] ftrace: Add 'function-fork' trace option (v1)

On Wed, 29 Mar 2017 10:46:21 +0900
Namhyung Kim <namhyung@...nel.org> wrote:

> Hello,
> 
> This patchset add 'function-fork' option to function tracer which
> makes pid filter to be inherited like 'event-fork' does.  During the
> test, I found a bug of pid filter on an instance directory.  The patch
> 1 fixes it and maybe it should go to the stable tree.
> 
> The function-fork option is disabled by default as event-fork does,
> but we might consider changing the default since it seems to be more
> natural from an user's perspective IMHO.

By the way, I thought that event-fork option also effected to
function tracer. Is there any reason we should separate those?
I mean, we can add "trace-fork" option instead of "function-fork"
for setting both pid filters at once.

Thank you,

> 
> The code is also available at 'ftrace/function-fork-v1' branch on
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
> 
> Thanks,
> Namhyung
> 
> 
> Namhyung Kim (4):
>   ftrace: Fix function pid filter on instances
>   ftrace: Add 'function-fork' trace option
>   selftests: ftrace: Add -l/--logdir option
>   selftests: ftrace: Add a testcase for function PID filter
> 
>  kernel/trace/ftrace.c                              | 47 ++++++++++-
>  kernel/trace/trace.c                               |  6 +-
>  kernel/trace/trace.h                               |  8 +-
>  tools/testing/selftests/ftrace/ftracetest          |  5 ++
>  .../ftrace/test.d/ftrace/func-filter-pid.tc        | 98 ++++++++++++++++++++++
>  5 files changed, 158 insertions(+), 6 deletions(-)
>  create mode 100644 tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc
> 
> -- 
> 2.12.0
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>