linux-kernel - Re: [PATCH v9 4/4] perf probe: Support SDT markers having reference counter (semaphore)

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Message-ID: <20180830185026.GI6097@kernel.org>
Date:   Thu, 30 Aug 2018 15:50:27 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        srikar@...ux.vnet.ibm.com, oleg@...hat.com, mhiramat@...nel.org,
        liu.song.a23@...il.com, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, linux-kernel@...r.kernel.org,
        ananth@...ux.vnet.ibm.com, alexis.berlemont@...il.com,
        naveen.n.rao@...ux.vnet.ibm.com,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...ux-mips.org,
        linux@...linux.org.uk, ralf@...ux-mips.org, paul.burton@...s.com
Subject: Re: [PATCH v9 4/4] perf probe: Support SDT markers having reference
 counter (semaphore)

Em Thu, Aug 30, 2018 at 02:45:31PM -0400, Steven Rostedt escreveu:
> 
> Arnaldo,
> 
> I'm going to be playing with some of the probe code which may conflict
> with these patches, so I would like to pull these in my tree. But this
> patch requires an Acked-by from you before I can pull it in.
> 
> You OK with this?

Acked-by: Arnaldo Carvalho de Melo <acme@...hat.com>
 
> Thanks!
> 
> -- Steve
> 
> 
> On Mon, 20 Aug 2018 10:12:50 +0530
> Ravi Bangoria <ravi.bangoria@...ux.ibm.com> wrote:
> 
> > With this, perf buildid-cache will save SDT markers with reference
> > counter in probe cache. Perf probe will be able to probe markers
> > having reference counter. Ex,
> > 
> >   # readelf -n /tmp/tick | grep -A1 loop2
> >     Name: loop2
> >     ... Semaphore: 0x0000000010020036
> > 
> >   # ./perf buildid-cache --add /tmp/tick
> >   # ./perf probe sdt_tick:loop2
> >   # ./perf stat -e sdt_tick:loop2 /tmp/tick
> >     hi: 0
> >     hi: 1
> >     hi: 2
> >     ^C
> >      Performance counter stats for '/tmp/tick':
> >                  3      sdt_tick:loop2
> >        2.561851452 seconds time elapsed
> > 
> > Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
> > Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
> > Acked-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>