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.

Adrian Hunter committed 13 years ago

Commit fa0097e1 parent f9da0b01 file · +1 −0Browse files

Showing the changes to include/uapi/linux (1 of 1 file). Show all

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include/uapi/linux/perf_event.h+1−0

@@ -109,6 +109,7 @@ enum perf_sw_ids { · 108 unmodified lines
109	PERF_COUNT_SW_PAGE_FAULTS_MAJ = 6,	109	PERF_COUNT_SW_PAGE_FAULTS_MAJ = 6,
110	PERF_COUNT_SW_ALIGNMENT_FAULTS = 7,	110	PERF_COUNT_SW_ALIGNMENT_FAULTS = 7,
111	PERF_COUNT_SW_EMULATION_FAULTS = 8,	111	PERF_COUNT_SW_EMULATION_FAULTS = 8,
		112	PERF_COUNT_SW_DUMMY = 9,
112		113
113	PERF_COUNT_SW_MAX, /* non-ABI */	114	PERF_COUNT_SW_MAX, /* non-ABI */
114	};	115	};