linux-kernel - Re: [RFC][PATCH 0/3] tracing: Make error

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Date:   Mon, 8 Apr 2019 09:08:57 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
        Tom Zanussi <zanussi@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Namhyung Kim <namhyung@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>
Subject: Re: [RFC][PATCH 0/3] tracing: Make error_log per instance

Hi Steve,

Sorry for replying late.

On Tue, 02 Apr 2019 14:29:51 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> Hi Tom,
> 
> I noticed that you created an error_log file in every instance, but
> they all show the same errors. These three patches make it so that
> the errors appear in the instance directory that they happened in.
> If you write a bad error to
> 
>    /sys/kernel/tracing/instance/foo/events/sched/sched_switch/hist
> 
> It appears only in
> 
>   /sys/kernel/tracing/instances/foo/error_log
> 
> Which I think is the proper approach, especially instances should not
> affect the top directory or other instances.

Agreed, leaking the probe-event error on instance will not be good.

> 
> For those errors that do not have an associated instance (creating a
> kprobe/uprobe event or perf), a NULL passed to tracing_log_err() will
> result in the error message in the top level error message.
> 
> Do you (or Masami) have any issues with this patch set?
> 
> If not, please add a "reviewed-by" or "acked-by" and I'll add it
> to your patch series and push them to for-next (after more testing).

This looks good to me.

Reviewed-by: Masami Hiramatsu <mhiramat@...nel.org>

Thank you!

> 
> If this isn't obvious, this patch series is on top of:
> 
>   http://lkml.kernel.org/r/cover.1554072478.git.tom.zanussi@linux.intel.com
> 
> Actually, I added it right after patch 5 of that series (before the
> selftests and documentation).
> 
> Thanks!
> 
> -- Steve
> 
> 
> 
> Steven Rostedt (VMware) (3):
>       tracing: Add trace_array parameter to create_event_filter()
>       tracing: Have histogram code pass around trace_array for error handling
>       tracing: Have the error logs show up in the proper instances
> 
> ----
>  kernel/trace/trace.c                |  55 +++++++++-----
>  kernel/trace/trace.h                |   8 +-
>  kernel/trace/trace_events_filter.c  |  25 ++++---
>  kernel/trace/trace_events_hist.c    | 145 ++++++++++++++++++++----------------
>  kernel/trace/trace_events_trigger.c |   3 +-
>  kernel/trace/trace_probe.c          |   2 +-
>  6 files changed, 142 insertions(+), 96 deletions(-)


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