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Message-ID: <ZmJZULPzy0C4aPiO@google.com>
Date: Thu, 6 Jun 2024 17:50:24 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Madadi Vineeth Reddy <vineethr@...ux.ibm.com>
Cc: acme@...nel.org, peterz@...radead.org, mingo@...hat.com,
mark.rutland@....com, alexander.shishkin@...ux.intel.com,
jolsa@...nel.org, irogers@...gle.com, adrian.hunter@...el.com,
kan.liang@...ux.intel.com, acme@...hat.com,
atrajeev@...ux.vnet.ibm.com, kjain@...ux.ibm.com,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf sched map: Add command-name option to filter the
output map
Hello,
Sorry for the late reply.
On Wed, Apr 17, 2024 at 08:55:21PM +0530, Madadi Vineeth Reddy wrote:
> By default, perf sched map prints sched-in events for all the tasks
> which may not be required all the time as it prints lot of symbols
> and rows to the terminal.
>
> With --command-name option, one could specify the specific command
> for which the map has to be shown. This would help in analyzing the
> CPU usage patterns easier for that specific command. Since multiple
> PID's might have the same command name, using command-name filter
> would be more useful for debugging.
>
> For other tasks, instead of printing the symbol, ** is printed and
> the same . is used to represent idle. ** is used instead of symbol
> for other tasks because it helps in clear visualization of command
> of interest and secondly the symbol itself doesn't mean anything
> because the sched-in of that symbol will not be printed(first sched-in
> contains pid and the corresponding symbol).
>
> 6.8.0
> ======
> *A0 213864.670142 secs A0 => migration/0:18
> *. 213864.670148 secs . => swapper:0
> . *B0 213864.670217 secs B0 => migration/1:21
> . *. 213864.670223 secs
> . . *C0 213864.670247 secs C0 => migration/2:26
> . . *. 213864.670252 secs
>
> 6.8.0 + patch (--command-name = schbench)
> =============
> ** . ** *A0 213864.671055 secs A0 => schbench:104834
> *B0 . . A0 213864.671156 secs B0 => schbench:104835
> *C0 . . A0 213864.671187 secs C0 => schbench:104836
> *D0 . . A0 213864.671219 secs D0 => schbench:104837
> *E0 . . A0 213864.671250 secs E0 => schbench:104838
> E0 . *D0 A0
>
> This helps in visualizing how a benchmark like schbench is spread over
> the available cpus while also knowing which cpus are idle(.) and which
> are not(**). This will be more useful as number of CPUs increase.
Yeah I think this is good! Thanks for working on this.
But I guess people want to see when the tasks were sched out as well.
Can you please add that too?
>
> Signed-off-by: Madadi Vineeth Reddy <vineethr@...ux.ibm.com>
> ---
> tools/perf/Documentation/perf-sched.txt | 4 ++++
> tools/perf/builtin-sched.c | 17 ++++++++++++++---
> 2 files changed, 18 insertions(+), 3 deletions(-)
>
> diff --git a/tools/perf/Documentation/perf-sched.txt b/tools/perf/Documentation/perf-sched.txt
> index 5fbe42bd599b..b04a37560935 100644
> --- a/tools/perf/Documentation/perf-sched.txt
> +++ b/tools/perf/Documentation/perf-sched.txt
> @@ -94,6 +94,10 @@ OPTIONS for 'perf sched map'
> --color-pids::
> Highlight the given pids.
>
> +--command-name::
> + Map output only for the given command name.
> + (** indicates other tasks while . is idle).
Probably we can support multiple names in CSV.
Thanks,
Namhyung
> +
> OPTIONS for 'perf sched timehist'
> ---------------------------------
> -k::
> diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
> index 0fce7d8986c0..e60836da53e5 100644
> --- a/tools/perf/builtin-sched.c
> +++ b/tools/perf/builtin-sched.c
> @@ -156,6 +156,7 @@ struct perf_sched_map {
> const char *color_pids_str;
> struct perf_cpu_map *color_cpus;
> const char *color_cpus_str;
> + const char *command;
> struct perf_cpu_map *cpus;
> const char *cpus_str;
> };
> @@ -1594,8 +1595,6 @@ static int map_switch_event(struct perf_sched *sched, struct evsel *evsel,
>
> sched->curr_thread[this_cpu.cpu] = thread__get(sched_in);
>
> - printf(" ");
> -
> new_shortname = 0;
> if (!tr->shortname[0]) {
> if (!strcmp(thread__comm_str(sched_in), "swapper")) {
> @@ -1605,7 +1604,8 @@ static int map_switch_event(struct perf_sched *sched, struct evsel *evsel,
> */
> tr->shortname[0] = '.';
> tr->shortname[1] = ' ';
> - } else {
> + } else if (!sched->map.command || !strcmp(thread__comm_str(sched_in),
> + sched->map.command)) {
> tr->shortname[0] = sched->next_shortname1;
> tr->shortname[1] = sched->next_shortname2;
>
> @@ -1618,10 +1618,18 @@ static int map_switch_event(struct perf_sched *sched, struct evsel *evsel,
> else
> sched->next_shortname2 = '0';
> }
> + } else {
> + tr->shortname[0] = '*';
> + tr->shortname[1] = '*';
> }
> new_shortname = 1;
> }
>
> + if (sched->map.command && strcmp(thread__comm_str(sched_in), sched->map.command))
> + goto skip;
> +
> + printf(" ");
> +
> for (i = 0; i < cpus_nr; i++) {
> struct perf_cpu cpu = {
> .cpu = sched->map.comp ? sched->map.comp_cpus[i].cpu : i,
> @@ -1678,6 +1686,7 @@ static int map_switch_event(struct perf_sched *sched, struct evsel *evsel,
> out:
> color_fprintf(stdout, color, "\n");
>
> +skip:
> thread__put(sched_in);
>
> return 0;
> @@ -3560,6 +3569,8 @@ int cmd_sched(int argc, const char **argv)
> "highlight given CPUs in map"),
> OPT_STRING(0, "cpus", &sched.map.cpus_str, "cpus",
> "display given CPUs in map"),
> + OPT_STRING(0, "command-name", &sched.map.command, "command",
> + "map output only for the given command name"),
> OPT_PARENT(sched_options)
> };
> const struct option timehist_options[] = {
> --
> 2.39.1
>
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