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Message-ID: <ca5a13b1-6931-4237-b588-324889c241f1@linux.ibm.com>
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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