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8027294: Prepare hotspot for non TOD based uptime counter

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Use HR timer when available for os::elapsed_counter() on linux/bsd. Add a new counter for the JVM uptime.

Reviewed-by: dholmes, sla
This commit is contained in:
Jaroslav Bachorik 2013-10-25 09:07:58 +02:00
parent 86cd1aaa73
commit 76ac5b0c28
4 changed files with 12 additions and 12 deletions
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10
hotspot/src/os/linux/vm/os_linux.cpp
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@ -1333,17 +1333,15 @@ void os::Linux::capture_initial_stack(size_t max_size) {
// Used by VMSelfDestructTimer and the MemProfiler.
double os::elapsedTime() {
return (double)(os::elapsed_counter()) * 0.000001;
return ((double)os::elapsed_counter()) / os::elapsed_frequency(); // nanosecond resolution
}
jlong os::elapsed_counter() {
timeval time;
int status = gettimeofday(&time, NULL);
return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
return javaTimeNanos() - initial_time_count;
}
jlong os::elapsed_frequency() {
return (1000 * 1000);
return NANOSECS_PER_SEC; // nanosecond resolution
}
bool os::supports_vtime() { return true; }
@ -4750,7 +4748,7 @@ void os::init(void) {
Linux::_main_thread = pthread_self();
Linux::clock_init();
initial_time_count = os::elapsed_counter();
initial_time_count = javaTimeNanos();
// pthread_condattr initialization for monotonic clock
int status;