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SubjectRe: [PATCH 03/52] perf tools: Add thread_map event
Em Sun, Oct 25, 2015 at 03:51:19PM +0100, Jiri Olsa escreveu:
> Adding thread_map event to pass/store thread maps
> as data in pipe/perf.data.
>
> Storing thread ID along with the standard comm[16]
> thread name string.
>
> Link: http://lkml.kernel.org/n/tip-2l07qyf3buhnt83q4ezqz5sj@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> ---
> tools/perf/util/event.c | 1 +
> tools/perf/util/event.h | 13 +++++++++++++
> tools/perf/util/session.c | 26 ++++++++++++++++++++++++++
> tools/perf/util/tool.h | 3 ++-
> 4 files changed, 42 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
> index 8b10621b415c..771545a27b9b 100644
> --- a/tools/perf/util/event.c
> +++ b/tools/perf/util/event.c
> @@ -37,6 +37,7 @@ static const char *perf_event__names[] = {
> [PERF_RECORD_AUXTRACE_INFO] = "AUXTRACE_INFO",
> [PERF_RECORD_AUXTRACE] = "AUXTRACE",
> [PERF_RECORD_AUXTRACE_ERROR] = "AUXTRACE_ERROR",
> + [PERF_RECORD_THREAD_MAP] = "THREAD_MAP",
> };
>
> const char *perf_event__name(unsigned int id)
> diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
> index a0dbcbd4f6d8..f075f9ed0051 100644
> --- a/tools/perf/util/event.h
> +++ b/tools/perf/util/event.h
> @@ -226,6 +226,7 @@ enum perf_user_event_type { /* above any possible kernel type */
> PERF_RECORD_AUXTRACE_INFO = 70,
> PERF_RECORD_AUXTRACE = 71,
> PERF_RECORD_AUXTRACE_ERROR = 72,
> + PERF_RECORD_THREAD_MAP = 73,
> PERF_RECORD_HEADER_MAX
> };
>
> @@ -356,6 +357,17 @@ struct context_switch_event {
> u32 next_prev_tid;
> };
>
> +struct thread_map_data_event {

Humm, I think "data" here is way too vague here, how about
"thread_map_event_entry"?

Moving of "entry" to the end also helps in understanding that this is
not an "event" per se, it doesn't have the perv_event_header, etc, its
just an entry in a 'struct thread_map_event'.

I'm tentatively doing this change in my local branch, please let me know
if you have any reason to object to such a change,

- Arnaldo

> + u64 pid;
> + char comm[16];
> +};
> +
> +struct thread_map_event {
> + struct perf_event_header header;
> + u64 nr;
> + struct thread_map_data_event data[];
> +};
> +
> union perf_event {
> struct perf_event_header header;
> struct mmap_event mmap;
> @@ -378,6 +390,7 @@ union perf_event {
> struct aux_event aux;
> struct itrace_start_event itrace_start;
> struct context_switch_event context_switch;
> + struct thread_map_event thread_map;
> };
>
> void perf_event__print_totals(void);
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 428149bc64d2..ec1ecd31003b 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -296,6 +296,16 @@ int process_event_auxtrace_error_stub(struct perf_tool *tool __maybe_unused,
> return 0;
> }
>
> +
> +static
> +int process_event_thread_map_stub(struct perf_tool *tool __maybe_unused,
> + union perf_event *event __maybe_unused,
> + struct perf_session *session __maybe_unused)
> +{
> + dump_printf(": unhandled!\n");
> + return 0;
> +}
> +
> void perf_tool__fill_defaults(struct perf_tool *tool)
> {
> if (tool->sample == NULL)
> @@ -346,6 +356,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
> tool->auxtrace = process_event_auxtrace_stub;
> if (tool->auxtrace_error == NULL)
> tool->auxtrace_error = process_event_auxtrace_error_stub;
> + if (tool->thread_map == NULL)
> + tool->thread_map = process_event_thread_map_stub;
> }
>
> static void swap_sample_id_all(union perf_event *event, void *data)
> @@ -616,6 +628,17 @@ static void perf_event__auxtrace_error_swap(union perf_event *event,
> event->auxtrace_error.ip = bswap_64(event->auxtrace_error.ip);
> }
>
> +static void perf_event__thread_map_swap(union perf_event *event,
> + bool sample_id_all __maybe_unused)
> +{
> + unsigned i;
> +
> + event->thread_map.nr = bswap_64(event->thread_map.nr);
> +
> + for (i = 0; i < event->thread_map.nr; i++)
> + event->thread_map.data[i].pid = bswap_64(event->thread_map.data[i].pid);
> +}
> +
> typedef void (*perf_event__swap_op)(union perf_event *event,
> bool sample_id_all);
>
> @@ -643,6 +666,7 @@ static perf_event__swap_op perf_event__swap_ops[] = {
> [PERF_RECORD_AUXTRACE_INFO] = perf_event__auxtrace_info_swap,
> [PERF_RECORD_AUXTRACE] = perf_event__auxtrace_swap,
> [PERF_RECORD_AUXTRACE_ERROR] = perf_event__auxtrace_error_swap,
> + [PERF_RECORD_THREAD_MAP] = perf_event__thread_map_swap,
> [PERF_RECORD_HEADER_MAX] = NULL,
> };
>
> @@ -1179,6 +1203,8 @@ static s64 perf_session__process_user_event(struct perf_session *session,
> case PERF_RECORD_AUXTRACE_ERROR:
> perf_session__auxtrace_error_inc(session, event);
> return tool->auxtrace_error(tool, event, session);
> + case PERF_RECORD_THREAD_MAP:
> + return tool->thread_map(tool, event, session);
> default:
> return -EINVAL;
> }
> diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
> index cab8cc24831b..1af4774960c3 100644
> --- a/tools/perf/util/tool.h
> +++ b/tools/perf/util/tool.h
> @@ -55,7 +55,8 @@ struct perf_tool {
> event_op2 build_id,
> id_index,
> auxtrace_info,
> - auxtrace_error;
> + auxtrace_error,
> + thread_map;
> event_op3 auxtrace;
> bool ordered_events;
> bool ordering_requires_timestamps;
> --
> 2.4.3


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