perf_counter: comment the perf_event_type stuff (0c593b34) · Commits · 戴 / test

include/linux/perf_counter.h

+32 −0

Original line number	Diff line number	Diff line
		@@ -208,6 +208,20 @@ struct perf_event_header {

		enum perf_event_type {

		/*
		* The MMAP events record the PROT_EXEC mappings so that we can
		* correlate userspace IPs to code. They have the following structure:
		*
		* struct {
		* struct perf_event_header header;
		*
		* u32 pid, tid;
		* u64 addr;
		* u64 len;
		* u64 pgoff;
		* char filename[];
		* };
		*/
		PERF_EVENT_MMAP = 1,
		PERF_EVENT_MUNMAP = 2,

		@@ -217,6 +231,24 @@ enum perf_event_type {
		*
		* These events will have types of the form:
		* PERF_EVENT_COUNTER_OVERFLOW { \| __PERF_EVENT_* } *
		*
		* struct {
		* struct perf_event_header header;
		*
		* { u64 ip; } && __PERF_EVENT_IP
		* { u32 pid, tid; } && __PERF_EVENT_TID
		*
		* { u64 nr;
		* { u64 event, val; } cnt[nr]; } && __PERF_EVENT_GROUP
		*
		* { u16 nr,
		* hv,
		* kernel,
		* user;
		* u64 ips[nr]; } && __PERF_EVENT_CALLCHAIN
		*
		* { u64 time; } && __PERF_EVENT_TIME
		* };
		*/
		PERF_EVENT_COUNTER_OVERFLOW = 1UL << 31,
		__PERF_EVENT_IP = PERF_RECORD_IP,