Re: [PATCH v3 0/6] tracing: export event trace and trace_marker

Tingwei Zhang
2020-09-01T23:25:40Z

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
> > >