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8242504: Enhance the system clock to nanosecond precision

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Co-authored-by: Mark Kralj-Taylor <kralj.mark@gmail.com>
Reviewed-by: dfuchs, rriggs, dcubed, vtewari
This commit is contained in:
David Holmes 2020-05-28 22:34:02 -04:00
parent 60ac615aa8
commit 7228978b19
6 changed files with 62 additions and 31 deletions
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35
src/hotspot/os/linux/os_linux.cpp
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@ -1376,18 +1376,35 @@ double os::elapsedVTime() {
}
jlong os::javaTimeMillis() {
timeval time;
int status = gettimeofday(&time, NULL);
assert(status != -1, "linux error");
return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
if (os::Posix::supports_clock_gettime()) {
struct timespec ts;
int status = os::Posix::clock_gettime(CLOCK_REALTIME, &ts);
assert_status(status == 0, status, "gettime error");
return jlong(ts.tv_sec) * MILLIUNITS +
jlong(ts.tv_nsec) / NANOUNITS_PER_MILLIUNIT;
} else {
timeval time;
int status = gettimeofday(&time, NULL);
assert(status != -1, "linux error");
return jlong(time.tv_sec) * MILLIUNITS +
jlong(time.tv_usec) / (MICROUNITS / MILLIUNITS);
}
}
void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
timeval time;
int status = gettimeofday(&time, NULL);
assert(status != -1, "linux error");
seconds = jlong(time.tv_sec);
nanos = jlong(time.tv_usec) * 1000;
if (os::Posix::supports_clock_gettime()) {
struct timespec ts;
int status = os::Posix::clock_gettime(CLOCK_REALTIME, &ts);
assert_status(status == 0, status, "gettime error");
seconds = jlong(ts.tv_sec);
nanos = jlong(ts.tv_nsec);
} else {
timeval time;
int status = gettimeofday(&time, NULL);
assert(status != -1, "linux error");
seconds = jlong(time.tv_sec);
nanos = jlong(time.tv_usec) * (NANOUNITS / MICROUNITS);
}
}
void os::Linux::fast_thread_clock_init() {