linux-kernel - Re: [PATCH v3 0/6] tracing: export event trace and trace

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Message-ID: <20200914232448.GA20431@codeaurora.org>
Date:   Tue, 15 Sep 2020 07:24:48 +0800
From:   Tingwei Zhang <tingweiz@...eaurora.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Tingwei Zhang <tingwei@...eaurora.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        tsoni@...eaurora.org,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Mao Jinlong <jinlmao@...eaurora.org>,
        linux-kernel@...r.kernel.org, coresight@...ts.linaro.org
Subject: Re: [PATCH v3 0/6] tracing: export event trace and trace_marker

On Tue, Sep 15, 2020 at 06:43:09AM +0800, Steven Rostedt wrote:
> On Wed, 2 Sep 2020 07:28:39 +0800
> Tingwei Zhang <tingweiz@...eaurora.org> wrote:
> 
> > Hi Alexander,
> > 
> > May I know your comments for this patch set?
> 
> I ran your patch set against get_maintainers.pl and it came up with this:
> 
> Alexander Shishkin <alexander.shishkin@...ux.intel.com> (maintainer:SYSTEM
> TRACE MODULE CLASS)
> Maxime Coquelin <mcoquelin.stm32@...il.com> (maintainer:ARM/STM32
> ARCHITECTURE)
> Alexandre Torgue <alexandre.torgue@...com> (maintainer:ARM/STM32
> ARCHITECTURE)
> Steven Rostedt <rostedt@...dmis.org> (maintainer:TRACING)
> Ingo Molnar <mingo@...hat.com> (maintainer:TRACING)
> linux-stm32@...md-mailman.stormreply.com (moderated list:ARM/STM32
> ARCHITECTURE)
> linux-arm-kernel@...ts.infradead.org (moderated list:ARM/STM32
> ARCHITECTURE)
> linux-kernel@...r.kernel.org (open list)
> 
> I would use that to know who to send to.
> 
> You have Alexander, myself, Ingo and LKML, but you should add the others
> in
> that list for this series, and then it may get noticed. Please use
> get_maintainers.pl for future patches if you don't know who to send them
> to.
> 
> -- Steve
> 
Thanks a lot for the detail instructions, Steve.  I noticed that after
senting previous mail to Alexander.

I sent the patchset to maintainers and mail list as you mentioned in
https://patchwork.kernel.org/cover/11752107/.

Thanks,
Tingwei

> > 
> > Thanks,
> > Tingwei
> > 
> > On Thu, Aug 13, 2020 at 09:45:46AM +0800, Tingwei Zhang wrote:
> > > Ftrace has ability to export trace packets to other destination.
> > > Currently, only function trace can be exported. This series extends
> the
> > > support to event trace and trace_maker. STM is one possible
> destination to
> > > export ftrace. Use separate channel for each CPU to avoid mixing up
> > > packets
> > > from different CPUs together.
> > > 
> > > Change from v2:
> > > Change flag definition to BIT(). (Steven)
> > > Add comment in stm_ftrace_write() to clarify it's safe to use 
> > > smp_processor_id() here since preempt is disabled. (Steven) 
> > > 
> > > Change from v1:
> > > All changes are suggested by Steven Rostedt.
> > > User separate flag to control function trace, event trace and trace
> mark.
> > > Allocate channels according to num_possible_cpu() dynamically.
> > > Move ftrace_exports routines up so all ftrace can use them.
> > > 
> > > Tingwei Zhang (6):
> > >   stm class: ftrace: change dependency to TRACING
> > >   tracing: add flag to control different traces
> > >   tracing: add trace_export support for event trace
> > >   tracing: add trace_export support for trace_marker
> > >   stm class: ftrace: enable supported trace export flag
> > >   stm class: ftrace: use different channel accroding to CPU
> > > 
> > >  drivers/hwtracing/stm/Kconfig  |   2 +-
> > >  drivers/hwtracing/stm/ftrace.c |   7 +-
> > >  include/linux/trace.h          |   7 +
> > >  kernel/trace/trace.c           | 270
> ++++++++++++++++++---------------
> > >  4 files changed, 159 insertions(+), 127 deletions(-)
> > > 
> > > -- 
> > > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora
> Forum,
> > > a Linux Foundation Collaborative Project
> > >   
>