Messages in this thread Patch in this message | | | From | Adrian Hunter <> | Subject | [PATCH V2 1/3] perf: add a dummy software event to keep tracking | Date | Sat, 31 Aug 2013 21:50:51 +0300 |
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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> --- include/uapi/linux/perf_event.h | 1 + 1 file changed, 1 insertion(+)
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h index 42cb7b6..108c4bc 100644 --- a/include/uapi/linux/perf_event.h +++ b/include/uapi/linux/perf_event.h @@ -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 */ }; -- 1.7.11.7
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