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perf tools: Reformat record's control fd man text

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Adding available control commands in separate paragraph, so it's more
readable and easier to add new commands.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Budankov <abudankov@huawei.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20201216083914.47215-2-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2020-12-16 09:39:11 +01:00 committed by Arnaldo Carvalho de Melo
parent 526671bfc4
commit feca8a8342
1 changed files with 11 additions and 5 deletions
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16
tools/perf/Documentation/perf-record.txt
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@ -637,11 +637,17 @@ endif::HAVE_LIBPFM[]
--control=fifo:ctl-fifo[,ack-fifo]::
--control=fd:ctl-fd[,ack-fd]::
ctl-fifo / ack-fifo are opened and used as ctl-fd / ack-fd as follows.
Listen on ctl-fd descriptor for command to control measurement ('enable': enable events,
'disable': disable events, 'snapshot': AUX area tracing snapshot). Measurements can be
started with events disabled using --delay=-1 option. Optionally send control command
completion ('ack\n') to ack-fd descriptor to synchronize with the controlling process.
Example of bash shell script to enable and disable events during measurements:
Listen on ctl-fd descriptor for command to control measurement.
Available commands:
'enable' : enable events
'disable' : disable events
'snapshot': AUX area tracing snapshot).
Measurements can be started with events disabled using --delay=-1 option. Optionally
send control command completion ('ack\n') to ack-fd descriptor to synchronize with the
controlling process. Example of bash shell script to enable and disable events during
measurements:
#!/bin/bash