On 03.06.2020 18:44, Adrian Hunter wrote: > On 3/06/20 3:52 pm, Alexey Budankov wrote: >> >> 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 <alexey.budan...@linux.intel.com> >>>> --- >>>> 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. > > Instead of: > > "Measurements can be started paused using --delay=-1 option." > > perhaps: > > "To start with events disabled, the --delay=-1 option can be used."
Exactly. In v7.