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

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Date:   Thu, 30 Aug 2018 14:45:31 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     acme@...nel.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)


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?

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>