Performance counters: Estimate RMS for elapsed counters. Allow to use a perf counter across processes, deal with overruns and other resulting inconsistencies from cross-process use.

1 files changed, 11 insertions, 1 deletions

diff --git a/src/modules/systemlib/perf_counter.h b/src/modules/systemlib/perf_counter.h
index d06606a5d..92f064d04 100644
--- a/src/modules/systemlib/perf_counter.h
+++ b/src/modules/systemlib/perf_counter.h
@@ -56,7 +56,7 @@ typedef struct perf_ctr_header	*perf_counter_t;
 __BEGIN_DECLS
 
 /**
- * Create a new counter.
+ * Create a new local counter.
  *
  * @param type			The type of the new counter.
  * @param name			The counter name.
@@ -66,6 +66,16 @@ __BEGIN_DECLS
 __EXPORT extern perf_counter_t	perf_alloc(enum perf_counter_type type, const char *name);
 
 /**
+ * Get the reference to an existing counter or create a new one if it does not exist.
+ *
+ * @param type			The type of the counter.
+ * @param name			The counter name.
+ * @return			Handle for the counter, or NULL if a counter
+ *				could not be allocated.
+ */
+__EXPORT extern perf_counter_t	perf_alloc_once(enum perf_counter_type type, const char *name);
+
+/**
  * Free a counter.
  *
  * @param handle		The performance counter's handle.