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8154710: [Solaris] Investigate use of in-memory low-resolution timestamps for Java and internal time API's

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Reviewed-by: shade, rriggs, dcubed
This commit is contained in:
David Holmes 2016-05-02 19:38:15 -04:00
parent c4bafa7975
commit 0adae4d914
1 changed files with 21 additions and 12 deletions
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33
hotspot/src/os/solaris/vm/os_solaris.cpp
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@ -1351,24 +1351,29 @@ double os::elapsedVTime() {
return (double)gethrvtime() / (double)hrtime_hz;
}
// Used internally for comparisons only
// getTimeMillis guaranteed to not move backwards on Solaris
jlong getTimeMillis() {
jlong nanotime = getTimeNanos();
return (jlong)(nanotime / NANOSECS_PER_MILLISEC);
}
// in-memory timestamp support - has update accuracy of 1ms
typedef void (*_get_nsec_fromepoch_func_t)(hrtime_t*);
static _get_nsec_fromepoch_func_t _get_nsec_fromepoch = NULL;
// Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
jlong os::javaTimeMillis() {
timeval t;
if (gettimeofday(&t, NULL) == -1) {
fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno));
if (_get_nsec_fromepoch != NULL) {
hrtime_t now;
_get_nsec_fromepoch(&now);
return now / NANOSECS_PER_MILLISEC;
}
else {
timeval t;
if (gettimeofday(&t, NULL) == -1) {
fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno));
}
return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
}
return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
}
void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
timeval t;
// can't use get_nsec_fromepoch here as we need better accuracy than 1ms
if (gettimeofday(&t, NULL) == -1) {
fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno));
}
@ -4432,11 +4437,15 @@ void os::init(void) {
// enough to allow the thread to get to user bytecode execution.
Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
// retrieve entry point for pthread_setname_np
// dynamic lookup of functions that may not be available in our lowest
// supported Solaris release
void * handle = dlopen("libc.so.1", RTLD_LAZY);
if (handle != NULL) {
Solaris::_pthread_setname_np =
Solaris::_pthread_setname_np = // from 11.3
(Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np");
_get_nsec_fromepoch = // from 11.3.6
(_get_nsec_fromepoch_func_t) dlsym(handle, "get_nsec_fromepoch");
}
}