Re: [PATCH 1/3] perf tools: Add callchain to ctf conversion

Arnaldo Carvalho de Melo
2017-07-28T14:58:34Z

Em Fri, Jul 28, 2017 at 11:25:50AM +0200, Jiri Olsa escreveu:
> On Thu, Jul 27, 2017 at 02:12:03PM -0400, Geneviève Bastien wrote:
> > The field perf_callchain, if available, is added to the sampling
> > events during the CTF conversion. It is an array of u64 values.
> > The perf_callchain_size field contains the size of the array.
> >
> > It will allow the analysis of sampling data in trace visualization tools
> > like Trace Compass. Possible analyses with those data: dynamic
> > flamegraphs, correlation with other tracing data like a userspace trace.
> >
> > Here follows a babeltrace CTF output of a trace with callchain:
> >
> > $ babeltrace ./myctftrace
> > [17:38:45.672760285] (+?.?????????) cycles:ppp: { cpu_id = 0 }, { perf_ip = 0xFFFFFFFF81063EE4, perf_tid = 25841, perf_pid = 25774, perf_period = 1, perf_callchain_size = 7, perf_callchain = [ [0] = 0xFFFFFFFFFFFFFF80, [1] = 0xFFFFFFFF81063EE4, [2] = 0xFFFFFFFF8100C770, [3] = 0xFFFFFFFF81006EC6, [4] = 0xFFFFFFFF8118245E, [5] = 0xFFFFFFFF810A9224, [6] = 0xFFFFFFFF8164A4C6 ] }
> > [17:38:45.672777672] (+0.000017387) cycles:ppp: { cpu_id = 0 }, { perf_ip = 0xFFFFFFFF81063EE4, perf_tid = 25841, perf_pid = 25774, perf_period = 1, perf_callchain_size = 8, perf_callchain = [ [0] = 0xFFFFFFFFFFFFFF80, [1] = 0xFFFFFFFF81063EE4, [2] = 0xFFFFFFFF8100C770, [3] = 0xFFFFFFFF81006EC6, [4] = 0xFFFFFFFF8118245E, [5] = 0xFFFFFFFF810A9224, [6] = 0xFFFFFFFF8164A4C6, [7] = 0xFFFFFFFF8164ABAD ] }
> > [17:38:45.672786700] (+0.000009028) cycles:ppp: { cpu_id = 0 }, { perf_ip = 0xFFFFFFFF81063EE4, perf_tid = 25841, perf_pid = 25774, perf_period = 70, perf_callchain_size = 3, perf_callchain = [ [0] = 0xFFFFFFFFFFFFFF80, [1] = 0xFFFFFFFF81063EE4, [2] = 0xFFFFFFFF8100C770 ] }
>
> missing one more hunk (attached) ;-)
>
> I guess there's no need to resend, Arnaldo could remove it,

yeah, will do

> anyway for patchset:
>
> Acked-by: Jiri Olsa <jolsa@kernel.org>

Thanks!

- Arnaldo

> Is there already tracecompas change to display callchains and mmaps?
>
> thanks,
> jirka
>
>
> ---
> diff --git a/tools/perf/util/data-convert-bt.c b/tools/perf/util/data-convert-bt.c
> index c47b0943ef88..2346cecb8ea2 100644
> --- a/tools/perf/util/data-convert-bt.c
> +++ b/tools/perf/util/data-convert-bt.c
> @@ -596,7 +596,6 @@ static int add_generic_values(struct ctf_writer *cw,
> * PERF_SAMPLE_TIME - not needed as we have it in
> * ctf event header
> * PERF_SAMPLE_READ - TODO
> - * PERF_SAMPLE_CALLCHAIN - TODO
> * PERF_SAMPLE_RAW - tracepoint fields are handled separately
> * PERF_SAMPLE_BRANCH_STACK - TODO
> * PERF_SAMPLE_REGS_USER - TODO