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

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Message-ID: <20200901232524.GA13346@codeaurora.org>
Date:   Wed, 2 Sep 2020 07:25:25 +0800
From:   Tingwei Zhang <tingweiz@...eaurora.org>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Tingwei Zhang <tingwei@...eaurora.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        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 Wed, Sep 02, 2020 at 01:05:49AM +0800, Mathieu Poirier wrote:
> On Tue, Sep 01, 2020 at 02:37:40PM +0800, Tingwei Zhang wrote:
> > Hi Mathieu,
> > 
> > May I know your comments for this patch set?
> 
> I do not maintain any of these files.
> 
Sorry for my wrong assumption.

> > 
> > 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
> > >