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Commit fa0097ee authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo
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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: default avatarAdrian Hunter <adrian.hunter@intel.com>
Acked-by: default avatarPeter 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent f9da0b0c

include/uapi/linux/perf_event.h

+1 −0
Original line number Diff line number Diff line
@@ -109,6 +109,7 @@ enum perf_sw_ids { 
	PERF_COUNT_SW_PAGE_FAULTS_MAJ		= 6,

	PERF_COUNT_SW_ALIGNMENT_FAULTS		= 7,

	PERF_COUNT_SW_EMULATION_FAULTS		= 8,

	PERF_COUNT_SW_DUMMY			= 9,



	PERF_COUNT_SW_MAX,			/* non-ABI */

};