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Date: Thu, 23 Oct 2014 18:08:17 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Adrian Hunter <adrian.hunter@...el.com>
Cc: Peter Zijlstra <peterz@...radead.org>,
linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
Frederic Weisbecker <fweisbec@...il.com>,
Jiri Olsa <jolsa@...hat.com>,
Namhyung Kim <namhyung@...il.com>,
Paul Mackerras <paulus@...ba.org>,
Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 01/16] perf tools: Add id index
Em Thu, Oct 23, 2014 at 01:45:09PM +0300, Adrian Hunter escreveu:
> Add an index of the event identifiers.
>
> This is needed to queue Instruction
> Trace samples according to the mmap
> buffer from which they were recorded.
This gets difficult to review, I end up having to look at all the
patches together to figure out the use cases, to see if this here makes
sense...
Can you try to explain like to a seven year old?
Sigh.
'id' is somethig super vague, what does this identifies? I want to make
progress processing these patches, but with so short explanations like
the above one, it gets difficult.
- Arnaldo
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
> tools/perf/builtin-inject.c | 1 +
> tools/perf/util/event.c | 1 +
> tools/perf/util/event.h | 15 ++++++
> tools/perf/util/evlist.c | 26 ++++++++--
> tools/perf/util/evsel.h | 3 ++
> tools/perf/util/session.c | 122 ++++++++++++++++++++++++++++++++++++++++++++
> tools/perf/util/session.h | 10 ++++
> tools/perf/util/tool.h | 3 +-
> 8 files changed, 177 insertions(+), 4 deletions(-)
>
> diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
> index de99ca1..046c719 100644
> --- a/tools/perf/builtin-inject.c
> +++ b/tools/perf/builtin-inject.c
> @@ -410,6 +410,7 @@ int cmd_inject(int argc, const char **argv, const char *prefix __maybe_unused)
> .tracing_data = perf_event__repipe_op2_synth,
> .finished_round = perf_event__repipe_op2_synth,
> .build_id = perf_event__repipe_op2_synth,
> + .id_index = perf_event__repipe_op2_synth,
> },
> .input_name = "-",
> .samples = LIST_HEAD_INIT(inject.samples),
> diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
> index 4af6b27..bbf6705 100644
> --- a/tools/perf/util/event.c
> +++ b/tools/perf/util/event.c
> @@ -28,6 +28,7 @@ static const char *perf_event__names[] = {
> [PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
> [PERF_RECORD_HEADER_BUILD_ID] = "BUILD_ID",
> [PERF_RECORD_FINISHED_ROUND] = "FINISHED_ROUND",
> + [PERF_RECORD_ID_INDEX] = "ID_INDEX",
> };
>
> const char *perf_event__name(unsigned int id)
> diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
> index 5699e7e..c89518e 100644
> --- a/tools/perf/util/event.h
> +++ b/tools/perf/util/event.h
> @@ -187,6 +187,7 @@ enum perf_user_event_type { /* above any possible kernel type */
> PERF_RECORD_HEADER_TRACING_DATA = 66,
> PERF_RECORD_HEADER_BUILD_ID = 67,
> PERF_RECORD_FINISHED_ROUND = 68,
> + PERF_RECORD_ID_INDEX = 69,
> PERF_RECORD_HEADER_MAX
> };
>
> @@ -239,6 +240,19 @@ struct tracing_data_event {
> u32 size;
> };
>
> +struct id_index_entry {
> + u64 id;
> + u64 idx;
> + u64 cpu;
> + u64 tid;
> +};
> +
> +struct id_index_event {
> + struct perf_event_header header;
> + u64 nr;
> + struct id_index_entry entries[0];
> +};
> +
> union perf_event {
> struct perf_event_header header;
> struct mmap_event mmap;
> @@ -253,6 +267,7 @@ union perf_event {
> struct event_type_event event_type;
> struct tracing_data_event tracing_data;
> struct build_id_event build_id;
> + struct id_index_event id_index;
> };
>
> void perf_event__print_totals(void);
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index 3c9e77d..0babd39 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -527,6 +527,22 @@ static int perf_evlist__id_add_fd(struct perf_evlist *evlist,
> return 0;
> }
>
> +static void perf_evlist__set_sid_idx(struct perf_evlist *evlist,
> + struct perf_evsel *evsel, int idx, int cpu,
> + int thread)
> +{
> + struct perf_sample_id *sid = SID(evsel, cpu, thread);
> + sid->idx = idx;
> + if (evlist->cpus && cpu >= 0)
> + sid->cpu = evlist->cpus->map[cpu];
> + else
> + sid->cpu = -1;
> + if (!evsel->system_wide && evlist->threads && thread >= 0)
> + sid->tid = evlist->threads->map[thread];
> + else
> + sid->tid = -1;
> +}
> +
> struct perf_sample_id *perf_evlist__id2sid(struct perf_evlist *evlist, u64 id)
> {
> struct hlist_head *head;
> @@ -805,9 +821,13 @@ static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
> return -1;
> }
>
> - if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
> - perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
> - return -1;
> + if (evsel->attr.read_format & PERF_FORMAT_ID) {
> + if (perf_evlist__id_add_fd(evlist, evsel, cpu, thread,
> + fd) < 0)
> + return -1;
> + perf_evlist__set_sid_idx(evlist, evsel, idx, cpu,
> + thread);
> + }
> }
>
> return 0;
> diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
> index 163c560..4861e8c 100644
> --- a/tools/perf/util/evsel.h
> +++ b/tools/perf/util/evsel.h
> @@ -36,6 +36,9 @@ struct perf_sample_id {
> struct hlist_node node;
> u64 id;
> struct perf_evsel *evsel;
> + int idx;
> + int cpu;
> + pid_t tid;
>
> /* Holds total ID period value for PERF_SAMPLE_READ processing. */
> u64 period;
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 6702ac2..d70e37d 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -228,6 +228,15 @@ static int process_finished_round(struct perf_tool *tool,
> union perf_event *event,
> struct perf_session *session);
>
> +static int process_id_index_stub(struct perf_tool *tool __maybe_unused,
> + union perf_event *event __maybe_unused,
> + struct perf_session *perf_session
> + __maybe_unused)
> +{
> + dump_printf(": unhandled!\n");
> + return 0;
> +}
> +
> void perf_tool__fill_defaults(struct perf_tool *tool)
> {
> if (tool->sample == NULL)
> @@ -262,6 +271,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
> else
> tool->finished_round = process_finished_round_stub;
> }
> + if (tool->id_index == NULL)
> + tool->id_index = process_id_index_stub;
> }
>
> static void swap_sample_id_all(union perf_event *event, void *data)
> @@ -460,6 +471,7 @@ static perf_event__swap_op perf_event__swap_ops[] = {
> [PERF_RECORD_HEADER_EVENT_TYPE] = perf_event__event_type_swap,
> [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
> [PERF_RECORD_HEADER_BUILD_ID] = NULL,
> + [PERF_RECORD_ID_INDEX] = perf_event__all64_swap,
> [PERF_RECORD_HEADER_MAX] = NULL,
> };
>
> @@ -888,6 +900,8 @@ static s64 perf_session__process_user_event(struct perf_session *session,
> return tool->build_id(tool, event, session);
> case PERF_RECORD_FINISHED_ROUND:
> return tool->finished_round(tool, event, session);
> + case PERF_RECORD_ID_INDEX:
> + return tool->id_index(tool, event, session);
> default:
> return -EINVAL;
> }
> @@ -1594,3 +1608,111 @@ int __perf_session__set_tracepoints_handlers(struct perf_session *session,
> out:
> return err;
> }
> +
> +int perf_event__process_id_index(struct perf_tool *tool __maybe_unused,
> + union perf_event *event,
> + struct perf_session *session)
> +{
> + struct perf_evlist *evlist = session->evlist;
> + struct id_index_event *ie = &event->id_index;
> + size_t i, nr, max_nr;
> +
> + max_nr = (ie->header.size - sizeof(struct id_index_event)) /
> + sizeof(struct id_index_entry);
> + nr = ie->nr;
> + if (nr > max_nr)
> + return -EINVAL;
> +
> + if (dump_trace)
> + fprintf(stdout, " nr: %zu\n", nr);
> +
> + for (i = 0; i < nr; i++) {
> + struct id_index_entry *e = &ie->entries[i];
> + struct perf_sample_id *sid;
> +
> + if (dump_trace) {
> + fprintf(stdout, " ... id: %"PRIu64, e->id);
> + fprintf(stdout, " idx: %"PRIu64, e->idx);
> + fprintf(stdout, " cpu: %"PRId64, e->cpu);
> + fprintf(stdout, " tid: %"PRId64"\n", e->tid);
> + }
> +
> + sid = perf_evlist__id2sid(evlist, e->id);
> + if (!sid)
> + return -ENOENT;
> + sid->idx = e->idx;
> + sid->cpu = e->cpu;
> + sid->tid = e->tid;
> + }
> + return 0;
> +}
> +
> +int perf_event__synthesize_id_index(struct perf_tool *tool,
> + perf_event__handler_t process,
> + struct perf_evlist *evlist,
> + struct machine *machine)
> +{
> + union perf_event *ev;
> + struct perf_evsel *evsel;
> + size_t nr = 0, i = 0, sz, max_nr, n;
> + int err;
> +
> + pr_debug2("Synthesizing id index\n");
> +
> + max_nr = (UINT16_MAX - sizeof(struct id_index_event)) /
> + sizeof(struct id_index_entry);
> +
> + list_for_each_entry(evsel, &evlist->entries, node)
> + nr += evsel->ids;
> +
> + n = nr > max_nr ? max_nr : nr;
> + sz = sizeof(struct id_index_event) + n * sizeof(struct id_index_entry);
> + ev = zalloc(sz);
> + if (!ev)
> + return -ENOMEM;
> +
> + ev->id_index.header.type = PERF_RECORD_ID_INDEX;
> + ev->id_index.header.size = sz;
> + ev->id_index.nr = n;
> +
> + list_for_each_entry(evsel, &evlist->entries, node) {
> + u32 j;
> +
> + for (j = 0; j < evsel->ids; j++) {
> + struct id_index_entry *e;
> + struct perf_sample_id *sid;
> +
> + if (i >= n) {
> + err = process(tool, ev, NULL, machine);
> + if (err)
> + goto out_err;
> + nr -= n;
> + i = 0;
> + }
> +
> + e = &ev->id_index.entries[i++];
> +
> + e->id = evsel->id[j];
> +
> + sid = perf_evlist__id2sid(evlist, e->id);
> + if (!sid) {
> + free(ev);
> + return -ENOENT;
> + }
> +
> + e->idx = sid->idx;
> + e->cpu = sid->cpu;
> + e->tid = sid->tid;
> + }
> + }
> +
> + sz = sizeof(struct id_index_event) + nr * sizeof(struct id_index_entry);
> + ev->id_index.header.size = sz;
> + ev->id_index.nr = nr;
> +
> + err = process(tool, ev, NULL, machine);
> +out_err:
> + free(ev);
> +
> + return err;
> +}
> diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
> index a4be851..d8521ac 100644
> --- a/tools/perf/util/session.h
> +++ b/tools/perf/util/session.h
> @@ -126,4 +126,14 @@ int __perf_session__set_tracepoints_handlers(struct perf_session *session,
> extern volatile int session_done;
>
> #define session_done() ACCESS_ONCE(session_done)
> +
> +int perf_event__process_id_index(struct perf_tool *tool,
> + union perf_event *event,
> + struct perf_session *session);
> +
> +int perf_event__synthesize_id_index(struct perf_tool *tool,
> + perf_event__handler_t process,
> + struct perf_evlist *evlist,
> + struct machine *machine);
> +
> #endif /* __PERF_SESSION_H */
> diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
> index f116369..bb2708b 100644
> --- a/tools/perf/util/tool.h
> +++ b/tools/perf/util/tool.h
> @@ -39,7 +39,8 @@ struct perf_tool {
> event_attr_op attr;
> event_op2 tracing_data;
> event_op2 finished_round,
> - build_id;
> + build_id,
> + id_index;
> bool ordered_events;
> bool ordering_requires_timestamps;
> };
> --
> 1.9.1
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