Add software PMC support.

New kernel events can be added at various location for sampling or counting.
This will for example allow easy system profiling whatever the processor is
with known tools like pmcstat(8).

Simultaneous usage of software PMC and hardware PMC is possible, for example
looking at the lock acquire failure, page fault while sampling on
instructions.

Sponsored by: NETASQ
MFC after:	1 month

1 files changed, 16 insertions, 1 deletions

diff --git a/sys/sys/pmclog.h b/sys/sys/pmclog.h
index f2b6480..69062f7 100644
--- a/sys/sys/pmclog.h
+++ b/sys/sys/pmclog.h
@@ -60,7 +60,13 @@ enum pmclog_type {
 	 */
 	PMCLOG_TYPE_MAP_IN,
 	PMCLOG_TYPE_MAP_OUT,
-	PMCLOG_TYPE_CALLCHAIN
+	PMCLOG_TYPE_CALLCHAIN,
+	/*
+	 * V3 ABI
+	 *
+	 * New variant of PMCLOG_TYPE_PMCALLOCATE for dynamic event.
+	 */
+	PMCLOG_TYPE_PMCALLOCATEDYN
 };
 
 /*
@@ -204,6 +210,14 @@ struct pmclog_userdata {
 	uint32_t		pl_userdata;
 } __packed;
 
+struct pmclog_pmcallocatedyn {
+	PMCLOG_ENTRY_HEADER
+	uint32_t		pl_pmcid;
+	uint32_t		pl_event;
+	uint32_t		pl_flags;
+	char			pl_evname[PMC_NAME_MAX];
+} __packed;
+
 union pmclog_entry {		/* only used to size scratch areas */
 	struct pmclog_callchain		pl_cc;
 	struct pmclog_closelog		pl_cl;
@@ -213,6 +227,7 @@ union pmclog_entry {		/* only used to size scratch areas */
 	struct pmclog_map_out		pl_mo;
 	struct pmclog_pcsample		pl_s;
 	struct pmclog_pmcallocate	pl_a;
+	struct pmclog_pmcallocatedyn	pl_ad;
 	struct pmclog_pmcattach		pl_t;
 	struct pmclog_pmcdetach		pl_d;
 	struct pmclog_proccsw		pl_c;