Mercurial > hg > graal-jvmci-8
diff src/os/linux/vm/os_linux.cpp @ 12997:e4f478e7781b
8027294: Prepare hotspot for non TOD based uptime counter
Summary: Use HR timer when available for os::elapsed_counter() on linux/bsd. Add a new counter for the JVM uptime.
Reviewed-by: dholmes, sla
| author | jbachorik |
|---|---|
| date | Fri, 25 Oct 2013 09:07:58 +0200 |
| parents | aa6f2ea19d8f |
| children | 096c224171c4 c250880a6673 2b8e28fdf503 5656140324ed |
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--- a/src/os/linux/vm/os_linux.cpp Thu Oct 24 22:19:48 2013 -0700 +++ b/src/os/linux/vm/os_linux.cpp Fri Oct 25 09:07:58 2013 +0200 @@ -1333,17 +1333,15 @@ // 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 @@ 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;