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Date: Thu, 12 Aug 2021 11:15:30 +0200
From: Jiri Olsa <jolsa@...hat.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
LKML <linux-kernel@...r.kernel.org>,
Andi Kleen <ak@...ux.intel.com>,
Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Stephane Eranian <eranian@...gle.com>,
Jin Yao <yao.jin@...ux.intel.com>
Subject: Re: [PATCH v3 1/2] perf tools: Allow to control synthesize during
record
On Tue, Aug 10, 2021 at 09:46:57PM -0700, Namhyung Kim wrote:
> Depending on the use case, it might require some kind of synthesize
> and some not. Make it controllable to turn off heavy operations like
> MMAP for all tasks.
>
> Currently all users are converted to enable all the synthesis by
> default. It'll be updated in the later patch.
>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
for both patches
Acked-by: Jiri Olsa <jolsa@...hat.com>
thanks,
jirka
> ---
> tools/perf/bench/synthesize.c | 4 +--
> tools/perf/builtin-kvm.c | 2 +-
> tools/perf/builtin-record.c | 6 ++--
> tools/perf/builtin-top.c | 2 +-
> tools/perf/builtin-trace.c | 4 +--
> tools/perf/tests/code-reading.c | 3 +-
> tools/perf/tests/mmap-thread-lookup.c | 4 +--
> tools/perf/util/synthetic-events.c | 45 ++++++++++++++++-----------
> tools/perf/util/synthetic-events.h | 8 ++---
> 9 files changed, 44 insertions(+), 34 deletions(-)
>
> diff --git a/tools/perf/bench/synthesize.c b/tools/perf/bench/synthesize.c
> index 05f7c923c745..7401ebbac100 100644
> --- a/tools/perf/bench/synthesize.c
> +++ b/tools/perf/bench/synthesize.c
> @@ -80,7 +80,7 @@ static int do_run_single_threaded(struct perf_session *session,
> NULL,
> target, threads,
> process_synthesized_event,
> - data_mmap,
> + true, data_mmap,
> nr_threads_synthesize);
> if (err)
> return err;
> @@ -171,7 +171,7 @@ static int do_run_multi_threaded(struct target *target,
> NULL,
> target, NULL,
> process_synthesized_event,
> - false,
> + true, false,
> nr_threads_synthesize);
> if (err) {
> perf_session__delete(session);
> diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
> index aa1b127ffb5b..c6f352ee57e6 100644
> --- a/tools/perf/builtin-kvm.c
> +++ b/tools/perf/builtin-kvm.c
> @@ -1456,7 +1456,7 @@ static int kvm_events_live(struct perf_kvm_stat *kvm,
> perf_session__set_id_hdr_size(kvm->session);
> ordered_events__set_copy_on_queue(&kvm->session->ordered_events, true);
> machine__synthesize_threads(&kvm->session->machines.host, &kvm->opts.target,
> - kvm->evlist->core.threads, false, 1);
> + kvm->evlist->core.threads, true, false, 1);
> err = kvm_live_open_events(kvm);
> if (err)
> goto out;
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 548c1dbde6c5..764e391e89f8 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -1265,6 +1265,7 @@ static int record__synthesize_workload(struct record *rec, bool tail)
> err = perf_event__synthesize_thread_map(&rec->tool, thread_map,
> process_synthesized_event,
> &rec->session->machines.host,
> + true,
> rec->opts.sample_address);
> perf_thread_map__put(thread_map);
> return err;
> @@ -1479,8 +1480,9 @@ static int record__synthesize(struct record *rec, bool tail)
> f = process_locked_synthesized_event;
> }
>
> - err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->core.threads,
> - f, opts->sample_address,
> + err = __machine__synthesize_threads(machine, tool, &opts->target,
> + rec->evlist->core.threads,
> + f, true, opts->sample_address,
> rec->opts.nr_threads_synthesize);
>
> if (rec->opts.nr_threads_synthesize > 1)
> diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
> index a3ae9176a83e..020c4f110c10 100644
> --- a/tools/perf/builtin-top.c
> +++ b/tools/perf/builtin-top.c
> @@ -1271,7 +1271,7 @@ static int __cmd_top(struct perf_top *top)
> pr_debug("Couldn't synthesize cgroup events.\n");
>
> machine__synthesize_threads(&top->session->machines.host, &opts->target,
> - top->evlist->core.threads, false,
> + top->evlist->core.threads, true, false,
> top->nr_threads_synthesize);
>
> if (top->nr_threads_synthesize > 1)
> diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
> index 2bf21194c7b3..2f1d20553a0a 100644
> --- a/tools/perf/builtin-trace.c
> +++ b/tools/perf/builtin-trace.c
> @@ -1628,8 +1628,8 @@ static int trace__symbols_init(struct trace *trace, struct evlist *evlist)
> goto out;
>
> err = __machine__synthesize_threads(trace->host, &trace->tool, &trace->opts.target,
> - evlist->core.threads, trace__tool_process, false,
> - 1);
> + evlist->core.threads, trace__tool_process,
> + true, false, 1);
> out:
> if (err)
> symbol__exit();
> diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c
> index 9866cddebf23..3a4d932e7ffc 100644
> --- a/tools/perf/tests/code-reading.c
> +++ b/tools/perf/tests/code-reading.c
> @@ -606,7 +606,8 @@ static int do_test_code_reading(bool try_kcore)
> }
>
> ret = perf_event__synthesize_thread_map(NULL, threads,
> - perf_event__process, machine, false);
> + perf_event__process, machine,
> + true, false);
> if (ret < 0) {
> pr_debug("perf_event__synthesize_thread_map failed\n");
> goto out_err;
> diff --git a/tools/perf/tests/mmap-thread-lookup.c b/tools/perf/tests/mmap-thread-lookup.c
> index 8d9d4cbff76d..6f2da7a72f67 100644
> --- a/tools/perf/tests/mmap-thread-lookup.c
> +++ b/tools/perf/tests/mmap-thread-lookup.c
> @@ -135,7 +135,7 @@ static int synth_all(struct machine *machine)
> {
> return perf_event__synthesize_threads(NULL,
> perf_event__process,
> - machine, 0, 1);
> + machine, 1, 0, 1);
> }
>
> static int synth_process(struct machine *machine)
> @@ -147,7 +147,7 @@ static int synth_process(struct machine *machine)
>
> err = perf_event__synthesize_thread_map(NULL, map,
> perf_event__process,
> - machine, 0);
> + machine, 1, 0);
>
> perf_thread_map__put(map);
> return err;
> diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
> index a7e981b2d7de..a7a2825356d6 100644
> --- a/tools/perf/util/synthetic-events.c
> +++ b/tools/perf/util/synthetic-events.c
> @@ -715,7 +715,8 @@ static int __event__synthesize_thread(union perf_event *comm_event,
> union perf_event *fork_event,
> union perf_event *namespaces_event,
> pid_t pid, int full, perf_event__handler_t process,
> - struct perf_tool *tool, struct machine *machine, bool mmap_data)
> + struct perf_tool *tool, struct machine *machine,
> + bool needs_mmap, bool mmap_data)
> {
> char filename[PATH_MAX];
> struct dirent **dirent;
> @@ -739,7 +740,7 @@ static int __event__synthesize_thread(union perf_event *comm_event,
> * send mmap only for thread group leader
> * see thread__init_maps()
> */
> - if (pid == tgid &&
> + if (pid == tgid && needs_mmap &&
> perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
> process, machine, mmap_data))
> return -1;
> @@ -786,7 +787,7 @@ static int __event__synthesize_thread(union perf_event *comm_event,
> break;
>
> rc = 0;
> - if (_pid == pid && !kernel_thread) {
> + if (_pid == pid && !kernel_thread && needs_mmap) {
> /* process the parent's maps too */
> rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
> process, machine, mmap_data);
> @@ -806,7 +807,7 @@ int perf_event__synthesize_thread_map(struct perf_tool *tool,
> struct perf_thread_map *threads,
> perf_event__handler_t process,
> struct machine *machine,
> - bool mmap_data)
> + bool needs_mmap, bool mmap_data)
> {
> union perf_event *comm_event, *mmap_event, *fork_event;
> union perf_event *namespaces_event;
> @@ -836,7 +837,7 @@ int perf_event__synthesize_thread_map(struct perf_tool *tool,
> fork_event, namespaces_event,
> perf_thread_map__pid(threads, thread), 0,
> process, tool, machine,
> - mmap_data)) {
> + needs_mmap, mmap_data)) {
> err = -1;
> break;
> }
> @@ -862,7 +863,7 @@ int perf_event__synthesize_thread_map(struct perf_tool *tool,
> fork_event, namespaces_event,
> comm_event->comm.pid, 0,
> process, tool, machine,
> - mmap_data)) {
> + needs_mmap, mmap_data)) {
> err = -1;
> break;
> }
> @@ -882,6 +883,7 @@ int perf_event__synthesize_thread_map(struct perf_tool *tool,
> static int __perf_event__synthesize_threads(struct perf_tool *tool,
> perf_event__handler_t process,
> struct machine *machine,
> + bool needs_mmap,
> bool mmap_data,
> struct dirent **dirent,
> int start,
> @@ -926,7 +928,7 @@ static int __perf_event__synthesize_threads(struct perf_tool *tool,
> */
> __event__synthesize_thread(comm_event, mmap_event, fork_event,
> namespaces_event, pid, 1, process,
> - tool, machine, mmap_data);
> + tool, machine, needs_mmap, mmap_data);
> }
> err = 0;
>
> @@ -945,6 +947,7 @@ struct synthesize_threads_arg {
> struct perf_tool *tool;
> perf_event__handler_t process;
> struct machine *machine;
> + bool needs_mmap;
> bool mmap_data;
> struct dirent **dirent;
> int num;
> @@ -956,7 +959,8 @@ static void *synthesize_threads_worker(void *arg)
> struct synthesize_threads_arg *args = arg;
>
> __perf_event__synthesize_threads(args->tool, args->process,
> - args->machine, args->mmap_data,
> + args->machine,
> + args->needs_mmap, args->mmap_data,
> args->dirent,
> args->start, args->num);
> return NULL;
> @@ -965,7 +969,7 @@ static void *synthesize_threads_worker(void *arg)
> int perf_event__synthesize_threads(struct perf_tool *tool,
> perf_event__handler_t process,
> struct machine *machine,
> - bool mmap_data,
> + bool needs_mmap, bool mmap_data,
> unsigned int nr_threads_synthesize)
> {
> struct synthesize_threads_arg *args = NULL;
> @@ -994,7 +998,8 @@ int perf_event__synthesize_threads(struct perf_tool *tool,
>
> if (thread_nr <= 1) {
> err = __perf_event__synthesize_threads(tool, process,
> - machine, mmap_data,
> + machine,
> + needs_mmap, mmap_data,
> dirent, base, n);
> goto free_dirent;
> }
> @@ -1015,6 +1020,7 @@ int perf_event__synthesize_threads(struct perf_tool *tool,
> args[i].tool = tool;
> args[i].process = process;
> args[i].machine = machine;
> + args[i].needs_mmap = needs_mmap;
> args[i].mmap_data = mmap_data;
> args[i].dirent = dirent;
> }
> @@ -1775,26 +1781,27 @@ int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_
>
> int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
> struct target *target, struct perf_thread_map *threads,
> - perf_event__handler_t process, bool data_mmap,
> - unsigned int nr_threads_synthesize)
> + perf_event__handler_t process, bool needs_mmap,
> + bool data_mmap, unsigned int nr_threads_synthesize)
> {
> if (target__has_task(target))
> - return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap);
> + return perf_event__synthesize_thread_map(tool, threads, process, machine,
> + needs_mmap, data_mmap);
> else if (target__has_cpu(target))
> - return perf_event__synthesize_threads(tool, process,
> - machine, data_mmap,
> + return perf_event__synthesize_threads(tool, process, machine,
> + needs_mmap, data_mmap,
> nr_threads_synthesize);
> /* command specified */
> return 0;
> }
>
> int machine__synthesize_threads(struct machine *machine, struct target *target,
> - struct perf_thread_map *threads, bool data_mmap,
> - unsigned int nr_threads_synthesize)
> + struct perf_thread_map *threads, bool needs_mmap,
> + bool data_mmap, unsigned int nr_threads_synthesize)
> {
> return __machine__synthesize_threads(machine, NULL, target, threads,
> - perf_event__process, data_mmap,
> - nr_threads_synthesize);
> + perf_event__process, needs_mmap,
> + data_mmap, nr_threads_synthesize);
> }
>
> static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id)
> diff --git a/tools/perf/util/synthetic-events.h b/tools/perf/util/synthetic-events.h
> index c845e2b9b444..44f72d56ca4d 100644
> --- a/tools/perf/util/synthetic-events.h
> +++ b/tools/perf/util/synthetic-events.h
> @@ -53,8 +53,8 @@ int perf_event__synthesize_stat_events(struct perf_stat_config *config, struct p
> int perf_event__synthesize_stat_round(struct perf_tool *tool, u64 time, u64 type, perf_event__handler_t process, struct machine *machine);
> int perf_event__synthesize_stat(struct perf_tool *tool, u32 cpu, u32 thread, u64 id, struct perf_counts_values *count, perf_event__handler_t process, struct machine *machine);
> int perf_event__synthesize_thread_map2(struct perf_tool *tool, struct perf_thread_map *threads, perf_event__handler_t process, struct machine *machine);
> -int perf_event__synthesize_thread_map(struct perf_tool *tool, struct perf_thread_map *threads, perf_event__handler_t process, struct machine *machine, bool mmap_data);
> -int perf_event__synthesize_threads(struct perf_tool *tool, perf_event__handler_t process, struct machine *machine, bool mmap_data, unsigned int nr_threads_synthesize);
> +int perf_event__synthesize_thread_map(struct perf_tool *tool, struct perf_thread_map *threads, perf_event__handler_t process, struct machine *machine, bool needs_mmap, bool mmap_data);
> +int perf_event__synthesize_threads(struct perf_tool *tool, perf_event__handler_t process, struct machine *machine, bool needs_mmap, bool mmap_data, unsigned int nr_threads_synthesize);
> int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd, struct evlist *evlist, perf_event__handler_t process);
> int perf_event__synth_time_conv(const struct perf_event_mmap_page *pc, struct perf_tool *tool, perf_event__handler_t process, struct machine *machine);
> pid_t perf_event__synthesize_comm(struct perf_tool *tool, union perf_event *event, pid_t pid, perf_event__handler_t process, struct machine *machine);
> @@ -65,10 +65,10 @@ size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
>
> int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
> struct target *target, struct perf_thread_map *threads,
> - perf_event__handler_t process, bool data_mmap,
> + perf_event__handler_t process, bool needs_mmap, bool data_mmap,
> unsigned int nr_threads_synthesize);
> int machine__synthesize_threads(struct machine *machine, struct target *target,
> - struct perf_thread_map *threads, bool data_mmap,
> + struct perf_thread_map *threads, bool needs_mmap, bool data_mmap,
> unsigned int nr_threads_synthesize);
>
> #ifdef HAVE_AUXTRACE_SUPPORT
> --
> 2.32.0.605.g8dce9f2422-goog
>
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