perf tools: Add FIFO file names as alternative options to --control
Enable the --control option to accept file names as an alternative to
file descriptors.
Example:
$ mkfifo perf.control
$ mkfifo perf.ack
$ cat perf.ack &
[1] 6808
$ perf record --control fifo:perf.control,perf.ack -- sleep 300 &
[2] 6810
$ echo disable > perf.control
$ Events disabled
ack
$ echo enable > perf.control
$ Events enabled
ack
$ echo disable > perf.control
$ Events disabled
ack
$ kill %2
[ perf record: Woken up 4 times to write data ]
$ [ perf record: Captured and wrote 0.018 MB perf.data (7 samples) ]
[1]- Done cat perf.ack
[2]+ Terminated perf record --control fifo:perf.control,perf.ack -- sleep 300
$
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Alexey Budankov <alexey.budankov@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lore.kernel.org/lkml/20200902105707.11491-1-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
8 files changed