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

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Date:   Mon, 7 Dec 2020 20:51:42 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Ian Rogers <irogers@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Alexei Budankov <abudankov@...wei.com>
Subject: Re: [PATCH 3/3] perf tools: Allow to list events via control file

On Mon, Dec 07, 2020 at 01:28:06PM -0300, Arnaldo Carvalho de Melo wrote:

SNIP

> >     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@...e ~]$ 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@...e ~]$ 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@...e ~]$ 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

yea, hopefuly we won't be surprised what's enabled live in evsel ;-)

SNIP

> 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@...e ~]$
> 
> Also I think we should use 'evlist' instead of 'list', to be consistent.

ok, makes sense

thanks,
jirka