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Date: Sun, 30 Jun 2024 12:05:28 +0530
From: Madadi Vineeth Reddy <vineethr@...ux.ibm.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Athira Rajeev
<atrajeev@...ux.vnet.ibm.com>,
Chen Yu <yu.c.chen@...el.com>, Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>, Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>,
Kan Liang <kan.liang@...ux.intel.com>, acme@...hat.com,
Fernand Sieber <sieberf@...zon.com>,
linux-perf-users <linux-perf-users@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 2/3] perf sched map: Add support for multiple task
names using CSV
Hi Namhyung,
On 28/06/24 05:06, Namhyung Kim wrote:
> On Wed, Jun 26, 2024 at 02:45:49PM +0530, Madadi Vineeth Reddy wrote:
>> To track the scheduling patterns of multiple tasks simultaneously,
>> multiple task names can be specified using a comma separator
>> without any whitespace.
>>
>> Sample output for --task-name perf,wdavdaemon
>> =============
>> . *A0 . . . . - . 131040.641346 secs A0 => wdavdaemon:62509
>> . A0 *B0 . . . - . 131040.641378 secs B0 => wdavdaemon:62274
>> - *- - - - - - - 131040.641379 secs
>> *C0 . B0 . . . . . 131040.641572 secs C0 => wdavdaemon:62283
>>
>> ...
>>
>> - *- - - - - - - 131041.395649 secs
>> . . . . . . . *X2 131041.403969 secs X2 => perf:70211
>> - - - - - - - *- 131041.404006 secs
>>
>> Suggested-by: Namhyung Kim <namhyung@...nel.org>
>> Reviewed-and-tested-by: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
>> Signed-off-by: Madadi Vineeth Reddy <vineethr@...ux.ibm.com>
>> ---
>> tools/perf/Documentation/perf-sched.txt | 5 +-
>> tools/perf/builtin-sched.c | 77 +++++++++++++++++++++----
>> 2 files changed, 69 insertions(+), 13 deletions(-)
>>
>> diff --git a/tools/perf/Documentation/perf-sched.txt b/tools/perf/Documentation/perf-sched.txt
>> index 3255e5b8e74b..3095e280eb92 100644
>> --- a/tools/perf/Documentation/perf-sched.txt
>> +++ b/tools/perf/Documentation/perf-sched.txt
>> @@ -131,9 +131,10 @@ OPTIONS for 'perf sched map'
>> Highlight the given pids.
>>
>> --task-name <task>::
>> - Map output only for the given task name. The sched-out
>> + Map output only for the given task name(s). Separate the
>> + task names with a comma (without whitespace). The sched-out
>> time is printed and is represented by '*-' for the given
>> - task name
>> + task name(s).
>> ('-' indicates other tasks while '.' is idle).
>>
>> OPTIONS for 'perf sched timehist'
>> diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
>> index 57f166662d54..ecb43deb9d74 100644
>> --- a/tools/perf/builtin-sched.c
>> +++ b/tools/perf/builtin-sched.c
>> @@ -1540,24 +1540,72 @@ map__findnew_thread(struct perf_sched *sched, struct machine *machine, pid_t pid
>> return thread;
>> }
>>
>> -static bool sched_match_task(const char *comm_str, const char *commands)
>> +struct CommandList {
>
> Please don't use camel case.
>
Sure.
>> + char **command_list;
>> + int command_count;
>
> If you name the list as commands (or cmds) you can remove the prefix and
> use it like commands->list or cmds->count.
>
> Actually I was thinking about strlist API and it'd do most of the work
> you did here. You may want to add the fuzzy (or substring) matching
> there.
>
OK, thanks for the suggestion. Will use that.
>> +};
>> +
>> +static void free_command_list(struct CommandList *cmd_list)
>> +{
>> + if (cmd_list) {
>> + for (int i = 0; i < cmd_list->command_count; i++)
>> + free(cmd_list->command_list[i]);
>> + free(cmd_list->command_list);
>> + free(cmd_list);
>> + }
>
> Then it could be just strlist__delete().
>
>
>> +}
>> +
>> +static struct CommandList *parse_commands(const char *commands)
>> {
>> char *commands_copy = NULL;
>> + struct CommandList *cmd_list = NULL;
>> char *token = NULL;
>> - bool match_found = false;
>>
>> commands_copy = strdup(commands);
>> if (commands_copy == NULL)
>> return NULL;
>>
>> + cmd_list = malloc(sizeof(struct CommandList));
>> + if (cmd_list == NULL) {
>> + free(commands_copy);
>> + return NULL;
>> + }
>> +
>> + cmd_list->command_count = 0;
>> + cmd_list->command_list = NULL;
>
> You can use zalloc() and remove the zero initialization.
>
Sure.
>
>> +
>> token = strtok(commands_copy, ",");
>> + while (token != NULL) {
>> + cmd_list->command_list = realloc(cmd_list->command_list, sizeof(char *)
>> + *(cmd_list->command_count + 1));
>> + if (cmd_list->command_list == NULL) {
>> + free_command_list(cmd_list);
>> + free(commands_copy);
>> + return NULL;
>> + }
>>
>> - while (token != NULL && !match_found) {
>> - match_found = !strcmp(comm_str, token);
>> + cmd_list->command_list[cmd_list->command_count] = strdup(token);
>> + if (cmd_list->command_list[cmd_list->command_count] == NULL) {
>> + free_command_list(cmd_list);
>> + free(commands_copy);
>> + return NULL;
>> + }
>> +
>> + cmd_list->command_count++;
>> token = strtok(NULL, ",");
>> }
>>
>> free(commands_copy);
>> + return cmd_list;
>
> And this could be just `strlist__new(commands, NULL)`.
>
Thank you for the feedback. I will fix them in v6.
Thanks and Regards
Madadi Vineeth Reddy
> Thanks,
> Namhyung
>
>
>> +}
>> +
>> +static bool sched_match_task(const char *comm_str, struct CommandList *cmd_list)
>> +{
>> + bool match_found = false;
>> +
>> + for (int i = 0; i < cmd_list->command_count && !match_found; i++)
>> + match_found = !strcmp(comm_str, cmd_list->command_list[i]);
>> +
>> return match_found;
>> }
>>
>> @@ -1624,6 +1672,8 @@ static int map_switch_event(struct perf_sched *sched, struct evsel *evsel,
>> char stimestamp[32];
>> const char *str;
>>
>> + struct CommandList *cmd_list = NULL;
>> +
>> BUG_ON(this_cpu.cpu >= MAX_CPUS || this_cpu.cpu < 0);
>>
>> if (this_cpu.cpu > sched->max_cpu.cpu)
>> @@ -1664,7 +1714,11 @@ static int map_switch_event(struct perf_sched *sched, struct evsel *evsel,
>> sched->curr_thread[this_cpu.cpu] = thread__get(sched_in);
>> sched->curr_out_thread[this_cpu.cpu] = thread__get(sched_out);
>>
>> + if (sched->map.task_name)
>> + cmd_list = parse_commands(sched->map.task_name);
>> +
>> new_shortname = 0;
>> + str = thread__comm_str(sched_in);
>> if (!tr->shortname[0]) {
>> if (!strcmp(thread__comm_str(sched_in), "swapper")) {
>> /*
>> @@ -1673,8 +1727,7 @@ static int map_switch_event(struct perf_sched *sched, struct evsel *evsel,
>> */
>> tr->shortname[0] = '.';
>> tr->shortname[1] = ' ';
>> - } else if (!sched->map.task_name || sched_match_task(thread__comm_str(sched_in),
>> - sched->map.task_name)) {
>> + } else if (!sched->map.task_name || sched_match_task(str, cmd_list)) {
>> tr->shortname[0] = sched->next_shortname1;
>> tr->shortname[1] = sched->next_shortname2;
>>
>> @@ -1703,15 +1756,15 @@ static int map_switch_event(struct perf_sched *sched, struct evsel *evsel,
>> * Check which of sched_in and sched_out matches the passed --task-name
>> * arguments and call the corresponding print_sched_map.
>> */
>> - if (sched->map.task_name && !sched_match_task(str, sched->map.task_name)) {
>> - if (!sched_match_task(thread__comm_str(sched_out), sched->map.task_name))
>> + if (sched->map.task_name && !sched_match_task(str, cmd_list)) {
>> + if (!sched_match_task(thread__comm_str(sched_out), cmd_list))
>> goto out;
>> else
>> goto sched_out;
>>
>> } else {
>> str = thread__comm_str(sched_out);
>> - if (!(sched->map.task_name && !sched_match_task(str, sched->map.task_name)))
>> + if (!(sched->map.task_name && !sched_match_task(str, cmd_list)))
>> proceed = 1;
>> }
>>
>> @@ -1758,8 +1811,10 @@ static int map_switch_event(struct perf_sched *sched, struct evsel *evsel,
>> color_fprintf(stdout, color, "\n");
>>
>> out:
>> - if (sched->map.task_name)
>> + if (sched->map.task_name) {
>> + free_command_list(cmd_list);
>> thread__put(sched_out);
>> + }
>>
>> thread__put(sched_in);
>>
>> @@ -3651,7 +3706,7 @@ int cmd_sched(int argc, const char **argv)
>> OPT_STRING(0, "cpus", &sched.map.cpus_str, "cpus",
>> "display given CPUs in map"),
>> OPT_STRING(0, "task-name", &sched.map.task_name, "task",
>> - "map output only for the given task name"),
>> + "map output only for the given task name(s)."),
>> OPT_PARENT(sched_options)
>> };
>> const struct option timehist_options[] = {
>> --
>> 2.43.2
>>
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