linux-kernel - Re: [PATCH V8 21/23] perf tools: adding perf_evlist to *info_priv

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Date:	Mon, 25 Jan 2016 13:48:28 -0700
From:	Mathieu Poirier <mathieu.poirier@...aro.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH V8 21/23] perf tools: adding perf_evlist to *info_priv_size()

On 14 January 2016 at 14:46, Mathieu Poirier <mathieu.poirier@...aro.org> wrote:
> On some architecture the size of the private header may
> be dependent on the number of tracers used in the session.  As
> such adding a "struct perf_evlist *" parameter, which should
> contain all the required information.
>
> Also adjusting the existing client of the interface to take
> the new parameter into account.
>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> ---
>  tools/perf/arch/x86/util/intel-bts.c | 4 +++-
>  tools/perf/arch/x86/util/intel-pt.c  | 4 +++-
>  tools/perf/util/auxtrace.c           | 7 ++++---
>  tools/perf/util/auxtrace.h           | 6 ++++--
>  4 files changed, 14 insertions(+), 7 deletions(-)
>
> diff --git a/tools/perf/arch/x86/util/intel-bts.c b/tools/perf/arch/x86/util/intel-bts.c
> index 9b94ce520917..4685a40777cc 100644
> --- a/tools/perf/arch/x86/util/intel-bts.c
> +++ b/tools/perf/arch/x86/util/intel-bts.c
> @@ -60,7 +60,9 @@ struct branch {
>         u64 misc;
>  };
>
> -static size_t intel_bts_info_priv_size(struct auxtrace_record *itr __maybe_unused)
> +static size_t
> +intel_bts_info_priv_size(struct auxtrace_record *itr __maybe_unused,
> +                        struct perf_evlist *evlist __maybe_unused)
>  {
>         return INTEL_BTS_AUXTRACE_PRIV_SIZE;
>  }
> diff --git a/tools/perf/arch/x86/util/intel-pt.c b/tools/perf/arch/x86/util/intel-pt.c
> index b02af064f0f9..e5c1f2e21f87 100644
> --- a/tools/perf/arch/x86/util/intel-pt.c
> +++ b/tools/perf/arch/x86/util/intel-pt.c
> @@ -273,7 +273,9 @@ intel_pt_pmu_default_config(struct perf_pmu *intel_pt_pmu)
>         return attr;
>  }
>
> -static size_t intel_pt_info_priv_size(struct auxtrace_record *itr __maybe_unused)
> +static size_t
> +intel_pt_info_priv_size(struct auxtrace_record *itr __maybe_unused,
> +                       struct perf_evlist *evlist __maybe_unused)
>  {
>         return INTEL_PT_AUXTRACE_PRIV_SIZE;
>  }
> diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
> index 7f10430af39c..cc1c9ce5cc56 100644
> --- a/tools/perf/util/auxtrace.c
> +++ b/tools/perf/util/auxtrace.c
> @@ -478,10 +478,11 @@ void auxtrace_heap__pop(struct auxtrace_heap *heap)
>                          heap_array[last].ordinal);
>  }
>
> -size_t auxtrace_record__info_priv_size(struct auxtrace_record *itr)
> +size_t auxtrace_record__info_priv_size(struct auxtrace_record *itr,
> +                                      struct perf_evlist *evlist)
>  {
>         if (itr)
> -               return itr->info_priv_size(itr);
> +               return itr->info_priv_size(itr, evlist);
>         return 0;
>  }
>
> @@ -852,7 +853,7 @@ int perf_event__synthesize_auxtrace_info(struct auxtrace_record *itr,
>         int err;
>
>         pr_debug2("Synthesizing auxtrace information\n");
> -       priv_size = auxtrace_record__info_priv_size(itr);
> +       priv_size = auxtrace_record__info_priv_size(itr, session->evlist);
>         ev = zalloc(sizeof(struct auxtrace_info_event) + priv_size);
>         if (!ev)
>                 return -ENOMEM;
> diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
> index b86f90db1352..e5a8e2d4f2af 100644
> --- a/tools/perf/util/auxtrace.h
> +++ b/tools/perf/util/auxtrace.h
> @@ -293,7 +293,8 @@ struct auxtrace_record {
>         int (*recording_options)(struct auxtrace_record *itr,
>                                  struct perf_evlist *evlist,
>                                  struct record_opts *opts);
> -       size_t (*info_priv_size)(struct auxtrace_record *itr);
> +       size_t (*info_priv_size)(struct auxtrace_record *itr,
> +                                struct perf_evlist *evlist);
>         int (*info_fill)(struct auxtrace_record *itr,
>                          struct perf_session *session,
>                          struct auxtrace_info_event *auxtrace_info,
> @@ -429,7 +430,8 @@ int auxtrace_parse_snapshot_options(struct auxtrace_record *itr,
>  int auxtrace_record__options(struct auxtrace_record *itr,
>                              struct perf_evlist *evlist,
>                              struct record_opts *opts);
> -size_t auxtrace_record__info_priv_size(struct auxtrace_record *itr);
> +size_t auxtrace_record__info_priv_size(struct auxtrace_record *itr,
> +                                      struct perf_evlist *evlist);
>  int auxtrace_record__info_fill(struct auxtrace_record *itr,
>                                struct perf_session *session,
>                                struct auxtrace_info_event *auxtrace_info,
> --
> 2.1.4
>

Arnaldo,

As with my previous email, I can't queue this patch for 4.6 without at
least a reviewed by from you.

It has been rebased to 4.5-rc1 here [1] for your convenience.  I will
be happy to use another baseline should that be more adequate for you.

Thanks,
Mathieu

[1]. https://git.linaro.org/people/mathieu.poirier/coresight.git/shortlog/refs/heads/perf-v4.5-rc1-V8