On 03.06.2020 15:05, Adrian Hunter wrote:
> On 25/05/20 5:23 pm, Alexey Budankov wrote:
>>
>> Introduce --ctl-fd[-ack] options to pass open file descriptors numbers
>> from command line. Extend perf-record.txt file with --ctl-fd[-ack]
>> options description. Document possible usage model introduced by
>> --ctl-fd[-ack] options by providing example bash shell script.
>>
>> Signed-off-by: Alexey Budankov <[email protected]>
>> ---
>> tools/perf/Documentation/perf-record.txt | 39 ++++++++++++++++++++++++
>> tools/perf/builtin-record.c | 10 ++++++
>> tools/perf/util/record.h | 2 ++
>> 3 files changed, 51 insertions(+)
>>
>> diff --git a/tools/perf/Documentation/perf-record.txt
>> b/tools/perf/Documentation/perf-record.txt
>> index c2c4ce7ccee2..5c012cfe68a4 100644
>> --- a/tools/perf/Documentation/perf-record.txt
>> +++ b/tools/perf/Documentation/perf-record.txt
>> @@ -614,6 +614,45 @@ appended unit character - B/K/M/G
>> The number of threads to run when synthesizing events for existing
>> processes.
>> By default, the number of threads equals 1.
>>
>> +--ctl-fd::
>> +--ctl-fd-ack::
>> +Listen on ctl-fd descriptor for command to control measurement ('enable':
>> enable events,
>> +'disable': disable events. Optionally send control command completion
>> ('ack') to fd-ack
>> +descriptor to synchronize with the controlling process.
>
> You should also explain the use of --delay=-1 here.
Well, possibly like this:
"Listen on ctl-fd descriptor for command to control measurement ('enable':
enable events,
'disable': disable events). Measurements can be started paused using
--delay=-1 option.
Optionally send control command completion ('ack') to fd-ack descriptor to
synchronize
with the controlling process. Example of bash shell script to enable and
disable events
during measurements:"
