Add omrthread_get_self_thread_time()

This function returns the user and system cpu time of the calling thread. This new function is needed because the only way that we're aware of to get the user CPU time of a thread is to use getrusage(RUSAGE_THREAD, ...) which can only be called on the current thread. Related: eclipse-openj9/openj9#20186 Signed-off-by: Gengchen Tuo <[email protected]>
eclipse-omr · Oct 11, 2024 · 3777a2a · 3777a2a
1 parent d68a419
commit 3777a2a
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diff --git a/include_core/thread_api.h b/include_core/thread_api.h
@@ -98,6 +98,11 @@ typedef struct omrthread_monitor_walk_state_t {
 	BOOLEAN lockTaken;
 } omrthread_monitor_walk_state_t;
 
+typedef struct omrthread_thread_time_t {
+	int64_t userTime;
+	int64_t sysTime;
+} omrthread_thread_time_t;
+
 /* ---------------- omrthreadinspect.c ---------------- */
 
 /**
@@ -1424,6 +1429,15 @@ omrthread_monitor_pin(omrthread_monitor_t monitor, omrthread_t self);
 void
 omrthread_monitor_unpin(omrthread_monitor_t monitor, omrthread_t self);
 
+/**
+ * Gets the system and user CPU time of the current thread
+ *
+ * @param[out] threadTime the pointer to the thread time structure
+ * @return 0 on success or -1 on failure
+ */
+intptr_t
+omrthread_get_self_thread_time(omrthread_thread_time_t *threadTime);
+
 /* forward struct definition */
 struct J9ThreadLibrary;
 

diff --git a/thread/common/thrprof.c b/thread/common/thrprof.c
@@ -28,6 +28,11 @@
  * APIs for querying per-thread statistics: CPU usage, stack usage.
  */
 
+#if defined (LINUX)
+#define _GNU_SOURCE
+#include <sys/resource.h>
+#endif /* defined (LINUX) */
+
 #include <string.h> /* for memset() */
 #include "omrcfg.h"
 
@@ -1025,3 +1030,34 @@ omrthread_get_jvm_cpu_usage_info_error_recovery(void)
 		GLOBAL_UNLOCK_SIMPLE(lib);
 	}
 }
+
+intptr_t
+omrthread_get_self_thread_time(omrthread_thread_time_t *threadTime) {
+ #if defined(LINUX)
+	struct rusage rUsage = {0};
+	int rc = getrusage(RUSAGE_THREAD, &rUsage);
+
+	if (-1 == rc) {
+		return -1;
+	}
+
+	threadTime->userTime = (SEC_TO_NANO_CONVERSION_CONSTANT * (int64_t)rUsage.ru_utime.tv_sec)
+							+ (MICRO_TO_NANO_CONVERSION_CONSTANT * (int64_t)rUsage.ru_utime.tv_usec);
+	threadTime->sysTime = (SEC_TO_NANO_CONVERSION_CONSTANT * (int64_t)rUsage.ru_stime.tv_sec)
+							+ (MICRO_TO_NANO_CONVERSION_CONSTANT * (int64_t)rUsage.ru_stime.tv_usec);
+#else /* defined(LINUX) */
+	omrthread_t self = omrthread_self();
+
+	int64_t userTime = omrthread_get_user_time(self);
+	int64_t cpuTime = omrthread_get_cpu_time(self);
+
+	if (-1 == cpuTime || -1 == userTime) {
+		return -1;
+	}
+
+	threadTime->sysTime = cpuTime - userTime;
+	threadTime->userTime = userTime;
+#endif /* defined(LINUX) */
+
+	return 0;
+}