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perf tools: Reformat record's control fd man text
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>
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@ -637,11 +637,17 @@ endif::HAVE_LIBPFM[]
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--control=fifo:ctl-fifo[,ack-fifo]::
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--control=fd:ctl-fd[,ack-fd]::
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ctl-fifo / ack-fifo are opened and used as ctl-fd / ack-fd as follows.
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Listen on ctl-fd descriptor for command to control measurement ('enable': enable events,
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'disable': disable events, 'snapshot': AUX area tracing snapshot). Measurements can be
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started with events disabled using --delay=-1 option. Optionally send control command
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completion ('ack\n') to ack-fd descriptor to synchronize with the controlling process.
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Example of bash shell script to enable and disable events during measurements:
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Listen on ctl-fd descriptor for command to control measurement.
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Available commands:
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'enable' : enable events
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'disable' : disable events
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'snapshot': AUX area tracing snapshot).
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Measurements can be started with events disabled using --delay=-1 option. Optionally
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send control command completion ('ack\n') to ack-fd descriptor to synchronize with the
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controlling process. Example of bash shell script to enable and disable events during
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measurements:
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#!/bin/bash
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