Re: [PATCH 3/3] perf tools: Allow to list events via control file

Arnaldo Carvalho de Melo
2020-12-07T16:28:46Z

Em Sun, Dec 06, 2020 at 06:05:19PM +0100, Jiri Olsa escreveu:
> Adding new control event to display all evlist events.
>
> The interface string for control file is 'list'. When
> received, perf will scan and print current evlist into
> perf record terminal.
>
> Example session:
>
> terminal 1:
> # mkfifo control ack perf.pipe
> # perf record --control=fifo:control,ack -D -1 --no-buffering -e 'sched:*' -o - > perf.pipe
> Events disabled
>
> terminal 2:
> # echo list > control
>
> terminal 1:
> # perf record --control=fifo:control,ack -D -1 --no-buffering -e 'sched:*' -o - > perf.pipe
> ...
> sched:sched_kthread_stop
> sched:sched_kthread_stop_ret
> sched:sched_waking
> sched:sched_wakeup
> sched:sched_wakeup_new
> sched:sched_switch
> sched:sched_migrate_task
> sched:sched_process_free
> sched:sched_process_exit
> sched:sched_wait_task
> sched:sched_process_wait
> sched:sched_process_fork
> sched:sched_process_exec
> sched:sched_stat_wait
> sched:sched_stat_sleep
> sched:sched_stat_iowait
> sched:sched_stat_blocked
> sched:sched_stat_runtime
> sched:sched_pi_setprio
> sched:sched_move_numa
> sched:sched_stick_numa
> sched:sched_swap_numa
> sched:sched_wake_idle_without_ipi
> dummy:HG
>
> This new command is handy to get real event names when
> wildcards are used.

Ok, would be nice to have a verbose mode like:

[acme@five ~]$ sudo ~acme/bin/perf record -e 'sched:*' sleep 0.001
[ perf record: Woken up 14 times to write data ]
[ perf record: Captured and wrote 0.023 MB perf.data (16 samples) ]
[acme@five ~]$ sudo ~acme/bin/perf evlist
sched:sched_kthread_stop
sched:sched_kthread_stop_ret
sched:sched_waking
sched:sched_wakeup
sched:sched_wakeup_new
sched:sched_switch
sched:sched_migrate_task
sched:sched_process_free
sched:sched_process_exit
sched:sched_wait_task
sched:sched_process_wait
sched:sched_process_fork
sched:sched_process_exec
sched:sched_stat_wait
sched:sched_stat_sleep
sched:sched_stat_iowait
sched:sched_stat_blocked
sched:sched_stat_runtime
sched:sched_pi_setprio
sched:sched_move_numa
sched:sched_stick_numa
sched:sched_swap_numa
sched:sched_wake_idle_without_ipi
# Tip: use 'perf evlist --trace-fields' to show fields for tracepoint events
[acme@five ~]$ sudo ~acme/bin/perf evlist -v
sched:sched_kthread_stop: type: 2, size: 120, config: 0x13f, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, mmap: 1, comm: 1, enable_on_exec: 1, task: 1, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1, ksymbol: 1, bpf_event: 1
sched:sched_kthread_stop_ret: type: 2, size: 120, config: 0x13e, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_waking: type: 2, size: 120, config: 0x13d, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_wakeup: type: 2, size: 120, config: 0x13c, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_wakeup_new: type: 2, size: 120, config: 0x13b, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_switch: type: 2, size: 120, config: 0x13a, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_migrate_task: type: 2, size: 120, config: 0x139, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_process_free: type: 2, size: 120, config: 0x138, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_process_exit: type: 2, size: 120, config: 0x137, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_wait_task: type: 2, size: 120, config: 0x136, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_process_wait: type: 2, size: 120, config: 0x135, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_process_fork: type: 2, size: 120, config: 0x134, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_process_exec: type: 2, size: 120, config: 0x133, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_stat_wait: type: 2, size: 120, config: 0x132, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_stat_sleep: type: 2, size: 120, config: 0x131, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_stat_iowait: type: 2, size: 120, config: 0x130, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_stat_blocked: type: 2, size: 120, config: 0x12f, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_stat_runtime: type: 2, size: 120, config: 0x12e, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_pi_setprio: type: 2, size: 120, config: 0x12d, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_move_numa: type: 2, size: 120, config: 0x12c, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_stick_numa: type: 2, size: 120, config: 0x12b, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_swap_numa: type: 2, size: 120, config: 0x12a, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
sched:sched_wake_idle_without_ipi: type: 2, size: 120, config: 0x129, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|ID|CPU|PERIOD|RAW, read_format: ID, disabled: 1, inherit: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
# Tip: use 'perf evlist --trace-fields' to show fields for tracepoint events
[acme@five ~]$

Also I think we should use 'evlist' instead of 'list', to be consistent.

Applied 1/3 and 2/3.

- Arnaldo

> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> ---
> tools/perf/builtin-record.c | 1 +
> tools/perf/builtin-stat.c | 1 +
> tools/perf/util/evlist.c | 6 ++++++
> tools/perf/util/evlist.h | 2 ++
> 4 files changed, 10 insertions(+)
>
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 582b8fba012c..f620ed056c89 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -1951,6 +1951,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
> case EVLIST_CTL_CMD_UNSUPPORTED:
> case EVLIST_CTL_CMD_ENABLE_EVSEL:
> case EVLIST_CTL_CMD_DISABLE_EVSEL:
> + case EVLIST_CTL_CMD_LIST:
> default:
> break;
> }
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index 6a21fb665008..56f2206b5991 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -592,6 +592,7 @@ static void process_evlist(struct evlist *evlist, unsigned int interval)
> case EVLIST_CTL_CMD_UNSUPPORTED:
> case EVLIST_CTL_CMD_ENABLE_EVSEL:
> case EVLIST_CTL_CMD_DISABLE_EVSEL:
> + case EVLIST_CTL_CMD_LIST:
> default:
> break;
> }
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index 05723227bebf..c05476ca2ff4 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -1931,6 +1931,9 @@ static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd,
> (sizeof(EVLIST_CTL_CMD_SNAPSHOT_TAG)-1))) {
> *cmd = EVLIST_CTL_CMD_SNAPSHOT;
> pr_debug("is snapshot\n");
> + } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_LIST_TAG,
> + (sizeof(EVLIST_CTL_CMD_LIST_TAG)-1))) {
> + *cmd = EVLIST_CTL_CMD_LIST;
> }
> }
>
> @@ -1995,6 +1998,9 @@ int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
> pr_info("failed: can't find %s event\n", evsel_name);
> }
> break;
> + case EVLIST_CTL_CMD_LIST:
> + evlist__for_each_entry(evlist, evsel)
> + pr_info("%s\n", evsel__name(evsel));
> case EVLIST_CTL_CMD_SNAPSHOT:
> break;
> case EVLIST_CTL_CMD_ACK:
> diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
> index e4e8ff8831a3..6b8a9918fdb2 100644
> --- a/tools/perf/util/evlist.h
> +++ b/tools/perf/util/evlist.h
> @@ -332,6 +332,7 @@ struct evsel *evlist__reset_weak_group(struct evlist *evlist, struct evsel *evse
> #define EVLIST_CTL_CMD_SNAPSHOT_TAG "snapshot"
> #define EVLIST_CTL_CMD_ENABLE_EVSEL_TAG "enable-"
> #define EVLIST_CTL_CMD_DISABLE_EVSEL_TAG "disable-"
> +#define EVLIST_CTL_CMD_LIST_TAG "list"
>
> #define EVLIST_CTL_CMD_MAX_LEN 64
>
> @@ -343,6 +344,7 @@ enum evlist_ctl_cmd {
> EVLIST_CTL_CMD_DISABLE_EVSEL,
> EVLIST_CTL_CMD_ACK,
> EVLIST_CTL_CMD_SNAPSHOT,
> + EVLIST_CTL_CMD_LIST,
> };
>
> int evlist__parse_control(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close);
> --
> 2.26.2
>

--

- Arnaldo