linux-kernel - Re: [PATCH] tools/power/x86/intel_pstate_tracer: Free the trace buffer memory

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Message-ID: <1515196012.26317.52.camel@linux.intel.com>
Date:   Fri, 05 Jan 2018 15:46:52 -0800
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Doug Smythies <doug.smythies@...il.com>
Cc:     Doug Smythies <dsmythies@...us.net>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH] tools/power/x86/intel_pstate_tracer: Free the trace
 buffer memory

On Fri, 2018-01-05 at 23:54 +0100, Rafael J. Wysocki wrote:
> On Fri, Jan 5, 2018 at 11:31 PM, Doug Smythies <doug.smythies@...il.c
> om> wrote:
> > 
> > The trace buffer memory should be, mostly, freed after
> > the buffer has been output.
> > 
> > This patch is required before a future patch that will allow
> > the user to override the default, and specify the trace buffer
> > memory allocation as a command line option.
> > 
> > Signed-off-by: Doug Smythies <dsmythies@...us.net>
> Looks OK to me.  Srinivas?

Acked-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>

> 
> > 
> > ---
> >  .../power/x86/intel_pstate_tracer/intel_pstate_tracer.py  | 15
> > +++++++++++++++
> >  1 file changed, 15 insertions(+)
> > 
> > diff --git
> > a/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py
> > b/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py
> > index 0b24dd9..29f50d4 100755
> > --- a/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py
> > +++ b/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py
> > @@ -411,6 +411,16 @@ def set_trace_buffer_size():
> >          print('IO error setting trace buffer size ')
> >          quit()
> > 
> > +def free_trace_buffer():
> > +    """ Free the trace buffer memory """
> > +
> > +    try:
> > +       open('/sys/kernel/debug/tracing/buffer_size_kb'
> > +                 , 'w').write("1")
> > +    except:
> > +        print('IO error setting trace buffer size ')
> > +        quit()
> > +
> >  def read_trace_data(filename):
> >      """ Read and parse trace data """
> > 
> > @@ -583,4 +593,9 @@ for root, dirs, files in os.walk('.'):
> >      for f in files:
> >          fix_ownership(f)
> > 
> > +clear_trace_file()
> > +# Free the memory
> > +if interval:
> > +    free_trace_buffer()
> > +
> >  os.chdir('../../')
> > --
> > 2.7.4
> >