perf: Add a dummy software event to keep tracking
authorAdrian Hunter <adrian.hunter@intel.com>
Sat, 31 Aug 2013 18:50:51 +0000 (21:50 +0300)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Mon, 2 Sep 2013 17:58:19 +0000 (14:58 -0300)
commitfa0097ee690693006ab1aea6c01ad3c851b65c77
tree15fd73d509ea6d76759082ba6b7c98ef41f0a53b
parentf9da0b0c74af25a68b9ac43a2c81f2eea970de5a
perf: Add a dummy software event to keep tracking

When an event is disabled the "tracking" events selected by the 'mmap',
'comm' and 'task' bits of struct perf_event_attr, are also disabled.
However, the information those events provide is necessary to resolve
symbols for when the main event is re-enabled.

The "tracking" events can be kept enabled by putting them on another
event, but that requires an event that otherwise does nothing.  A new
software event PERF_COUNT_SW_DUMMY is added for that purpose.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1377975053-3811-2-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
include/uapi/linux/perf_event.h