linux-kernel - Re: [PATCH v2 09/11] perf record: implement control commands handling

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Date:   Thu, 7 May 2020 11:58:45 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 09/11] perf record: implement control commands handling


On 06.05.2020 23:23, Arnaldo Carvalho de Melo wrote:
> Em Wed, May 06, 2020 at 09:29:05PM +0300, Alexey Budankov escreveu:
>>
>> Implement handling of 'enable' and 'disable' control commands
>> coming from control file descriptor.
>>
>> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
>> ---
>>  tools/perf/builtin-record.c | 18 +++++++++++++++++-
>>  1 file changed, 17 insertions(+), 1 deletion(-)
>>
>> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
>> index 8a14e68b86ad..2278a3efc747 100644
>> --- a/tools/perf/builtin-record.c
>> +++ b/tools/perf/builtin-record.c
>> @@ -1496,6 +1496,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
>>  	bool disabled = false, draining = false;
>>  	int fd;
>>  	float ratio = 0;
>> +	enum evlist_ctl_cmd cmd = CTL_CMD_UNSUPPORTED;
>>  
>>  	atexit(record__sig_exit);
>>  	signal(SIGCHLD, sig_handler);
>> @@ -1793,8 +1794,23 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
>>  			 * Propagate error, only if there's any. Ignore positive
>>  			 * number of returned events and interrupt error.
>>  			 */
>> -			if (err > 0 || (err < 0 && errno == EINTR))
>> +			if (err > 0 || (err < 0 && errno == EINTR)) {
>>  				err = 0;
>> +				if (perf_evlist__ctlfd_process(rec->evlist, &cmd) > 0) {
>> +					switch (cmd) {
>> +					case CTL_CMD_ENABLE:
>> +						pr_info(PERF_EVLIST__ENABLED_MSG);
>> +						break;
>> +					case CTL_CMD_DISABLE:
>> +						pr_info(PERF_EVLIST__DISABLED_MSG);
>> +						break;
>> +					case CTL_CMD_ACK:
>> +					case CTL_CMD_UNSUPPORTED:
> 
> Shouldn't we have a pr_debug() or even pr_err() for the unsupported one?

It already exists on lower level, at perf_evlist__ctlfd_process() (see patch 02/11).

~Alexey