--- old/src/os/bsd/vm/os_bsd.cpp 2011-12-09 11:25:10.690722884 -0800 +++ new/src/os/bsd/vm/os_bsd.cpp 2011-12-09 11:25:10.470271466 -0800 @@ -150,7 +150,6 @@ // for timer info max values which include all bits #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) -#define SEC_IN_NANOSECS 1000000000LL #define LARGEPAGES_BIT (1 << 6) //////////////////////////////////////////////////////////////////////////////// @@ -3445,8 +3444,6 @@ // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with // SIGSEGV, see 4355769. -const int NANOSECS_PER_MILLISECS = 1000000; - int os::sleep(Thread* thread, jlong millis, bool interruptible) { assert(thread == Thread::current(), "thread consistency check"); @@ -3469,7 +3466,7 @@ // not a guarantee() because JVM should not abort on kernel/glibc bugs assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); } else { - millis -= (newtime - prevtime) / NANOSECS_PER_MILLISECS; + millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; } if(millis <= 0) { @@ -3508,7 +3505,7 @@ // not a guarantee() because JVM should not abort on kernel/glibc bugs assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); } else { - millis -= (newtime - prevtime) / NANOSECS_PER_MILLISECS; + millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; } if(millis <= 0) break ; @@ -4197,7 +4194,7 @@ int rc = os::Bsd::clock_gettime(clockid, &tp); assert(rc == 0, "clock_gettime is expected to return 0 code"); - return (tp.tv_sec * SEC_IN_NANOSECS) + tp.tv_nsec; + return (tp.tv_sec * NANOSECS_PER_SEC) + tp.tv_nsec; } #endif @@ -5522,9 +5519,6 @@ * is no need to track notifications. */ - -#define NANOSECS_PER_SEC 1000000000 -#define NANOSECS_PER_MILLISEC 1000000 #define MAX_SECS 100000000 /* * This code is common to bsd and solaris and will be moved to a --- old/src/os/linux/vm/os_linux.cpp 2011-12-09 11:25:12.025556629 -0800 +++ new/src/os/linux/vm/os_linux.cpp 2011-12-09 11:25:11.809989250 -0800 @@ -127,7 +127,6 @@ // for timer info max values which include all bits #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) -#define SEC_IN_NANOSECS 1000000000LL #define LARGEPAGES_BIT (1 << 6) //////////////////////////////////////////////////////////////////////////////// @@ -3259,8 +3258,6 @@ // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with // SIGSEGV, see 4355769. -const int NANOSECS_PER_MILLISECS = 1000000; - int os::sleep(Thread* thread, jlong millis, bool interruptible) { assert(thread == Thread::current(), "thread consistency check"); @@ -3283,7 +3280,7 @@ // not a guarantee() because JVM should not abort on kernel/glibc bugs assert(!Linux::supports_monotonic_clock(), "time moving backwards"); } else { - millis -= (newtime - prevtime) / NANOSECS_PER_MILLISECS; + millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; } if(millis <= 0) { @@ -3322,7 +3319,7 @@ // not a guarantee() because JVM should not abort on kernel/glibc bugs assert(!Linux::supports_monotonic_clock(), "time moving backwards"); } else { - millis -= (newtime - prevtime) / NANOSECS_PER_MILLISECS; + millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; } if(millis <= 0) break ; @@ -3924,7 +3921,7 @@ int rc = os::Linux::clock_gettime(clockid, &tp); assert(rc == 0, "clock_gettime is expected to return 0 code"); - return (tp.tv_sec * SEC_IN_NANOSECS) + tp.tv_nsec; + return (tp.tv_sec * NANOSECS_PER_SEC) + tp.tv_nsec; } ///// @@ -5165,9 +5162,6 @@ * is no need to track notifications. */ - -#define NANOSECS_PER_SEC 1000000000 -#define NANOSECS_PER_MILLISEC 1000000 #define MAX_SECS 100000000 /* * This code is common to linux and solaris and will be moved to a --- old/src/os/solaris/vm/os_solaris.cpp 2011-12-09 11:25:13.285845911 -0800 +++ new/src/os/solaris/vm/os_solaris.cpp 2011-12-09 11:25:13.068089014 -0800 @@ -1674,7 +1674,6 @@ } -const int NANOSECS_PER_MILLISECS = 1000000; // gethrtime can move backwards if read from one cpu and then a different cpu // getTimeNanos is guaranteed to not move backward on Solaris // local spinloop created as faster for a CAS on an int than @@ -1803,7 +1802,7 @@ // getTimeMillis guaranteed to not move backwards on Solaris jlong getTimeMillis() { jlong nanotime = getTimeNanos(); - return (jlong)(nanotime / NANOSECS_PER_MILLISECS); + return (jlong)(nanotime / NANOSECS_PER_MILLISEC); } // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis @@ -6064,10 +6063,7 @@ * is no need to track notifications. */ -#define NANOSECS_PER_SEC 1000000000 -#define NANOSECS_PER_MILLISEC 1000000 #define MAX_SECS 100000000 - /* * This code is common to linux and solaris and will be moved to a * common place in dolphin. --- old/src/os/windows/vm/os_windows.cpp 2011-12-09 11:25:14.549788829 -0800 +++ new/src/os/windows/vm/os_windows.cpp 2011-12-09 11:25:14.335191382 -0800 @@ -821,17 +821,15 @@ } } -#define NANOS_PER_SEC CONST64(1000000000) -#define NANOS_PER_MILLISEC 1000000 jlong os::javaTimeNanos() { if (!has_performance_count) { - return javaTimeMillis() * NANOS_PER_MILLISEC; // the best we can do. + return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do. } else { LARGE_INTEGER current_count; QueryPerformanceCounter(¤t_count); double current = as_long(current_count); double freq = performance_frequency; - jlong time = (jlong)((current/freq) * NANOS_PER_SEC); + jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC); return time; } } @@ -847,15 +845,15 @@ info_ptr->may_skip_forward = true; } else { jlong freq = performance_frequency; - if (freq < NANOS_PER_SEC) { + if (freq < NANOSECS_PER_SEC) { // the performance counter is 64 bits and we will // be multiplying it -- so no wrap in 64 bits info_ptr->max_value = ALL_64_BITS; - } else if (freq > NANOS_PER_SEC) { + } else if (freq > NANOSECS_PER_SEC) { // use the max value the counter can reach to // determine the max value which could be returned julong max_counter = (julong)ALL_64_BITS; - info_ptr->max_value = (jlong)(max_counter / (freq / NANOS_PER_SEC)); + info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC)); } else { // the performance counter is 64 bits and we will // be using it directly -- so no wrap in 64 bits --- old/src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp 2011-12-09 11:25:15.786806182 -0800 +++ new/src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp 2011-12-09 11:25:15.557102622 -0800 @@ -672,15 +672,20 @@ } jlong PSMarkSweep::millis_since_last_gc() { - jlong ret_val = os::javaTimeMillis() - _time_of_last_gc; + // We need a montonically increasing time in ms but os::javaTimeMillis() + // does not guarantee montonicity. + jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; + jlong ret_val = now - _time_of_last_gc; // XXX See note in genCollectedHeap::millis_since_last_gc(). if (ret_val < 0) { - NOT_PRODUCT(warning("time warp: %d", ret_val);) + NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) return 0; } return ret_val; } void PSMarkSweep::reset_millis_since_last_gc() { - _time_of_last_gc = os::javaTimeMillis(); + // We need a montonically increasing time in ms but os::javaTimeMillis() + // does not guarantee montonicity. + _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; } --- old/src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp 2011-12-09 11:25:16.957030069 -0800 +++ new/src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp 2011-12-09 11:25:16.723512987 -0800 @@ -3398,17 +3398,22 @@ } jlong PSParallelCompact::millis_since_last_gc() { - jlong ret_val = os::javaTimeMillis() - _time_of_last_gc; + // We need a montonically increasing time in ms but os::javaTimeMillis() + // does not guarantee montonicity. + jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; + jlong ret_val = now - _time_of_last_gc; // XXX See note in genCollectedHeap::millis_since_last_gc(). if (ret_val < 0) { - NOT_PRODUCT(warning("time warp: %d", ret_val);) + NOT_PRODUCT(warning("time warp: "INT64_FORMAT, ret_val);) return 0; } return ret_val; } void PSParallelCompact::reset_millis_since_last_gc() { - _time_of_last_gc = os::javaTimeMillis(); + // We need a montonically increasing time in ms but os::javaTimeMillis() + // does not guarantee montonicity. + _time_of_last_gc = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; } ParMarkBitMap::IterationStatus MoveAndUpdateClosure::copy_until_full() --- old/src/share/vm/memory/genCollectedHeap.cpp 2011-12-09 11:25:18.233892006 -0800 +++ new/src/share/vm/memory/genCollectedHeap.cpp 2011-12-09 11:25:17.992844757 -0800 @@ -1460,26 +1460,22 @@ }; jlong GenCollectedHeap::millis_since_last_gc() { - jlong now = os::javaTimeMillis(); + // We need a montonically increasing time in ms but os::javaTimeMillis() + // does not guarantee montonicity. + jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; GenTimeOfLastGCClosure tolgc_cl(now); // iterate over generations getting the oldest // time that a generation was collected generation_iterate(&tolgc_cl, false); tolgc_cl.do_generation(perm_gen()); - // XXX Despite the assert above, since javaTimeMillis() - // doesnot guarantee monotonically increasing return - // values (note, i didn't say "strictly monotonic"), - // we need to guard against getting back a time - // later than now. This should be fixed by basing - // on someting like gethrtime() which guarantees - // monotonicity. Note that cond_wait() is susceptible - // to a similar problem, because its interface is - // based on absolute time in the form of the - // system time's notion of UCT. See also 4506635 - // for yet another problem of similar nature. XXX + + // javaTimeNanos() is guaranteed to be monotonically non-decreasing + // provided the underlying platform provides such a time source + // (and it is bug free). So we still have to guard against getting + // back a time later than 'now'. jlong retVal = now - tolgc_cl.time(); if (retVal < 0) { - NOT_PRODUCT(warning("time warp: %d", retVal);) + NOT_PRODUCT(warning("time warp: "INT64_FORMAT, retVal);) return 0; } return retVal; --- old/src/share/vm/memory/generation.hpp 2011-12-09 11:25:19.425406412 -0800 +++ new/src/share/vm/memory/generation.hpp 2011-12-09 11:25:19.196327533 -0800 @@ -416,7 +416,7 @@ // XXX See note in genCollectedHeap::millis_since_last_gc() NOT_PRODUCT( if (now < _time_of_last_gc) { - warning("time warp: %d to %d", _time_of_last_gc, now); + warning("time warp: "INT64_FORMAT" to "INT64_FORMAT, _time_of_last_gc, now); } ) return _time_of_last_gc; --- old/src/share/vm/memory/referenceProcessor.cpp 2011-12-09 11:25:20.596200349 -0800 +++ new/src/share/vm/memory/referenceProcessor.cpp 2011-12-09 11:25:20.366738000 -0800 @@ -43,7 +43,9 @@ } void ReferenceProcessor::init_statics() { - jlong now = os::javaTimeMillis(); + // We need a montonically increasing time in ms but os::javaTimeMillis() + // does not guarantee montonicity. + jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; // Initialize the soft ref timestamp clock. _soft_ref_timestamp_clock = now; @@ -151,7 +153,10 @@ void ReferenceProcessor::update_soft_ref_master_clock() { // Update (advance) the soft ref master clock field. This must be done // after processing the soft ref list. - jlong now = os::javaTimeMillis(); + + // We need a montonically increasing time in ms but os::javaTimeMillis() + // does not guarantee montonicity. + jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; jlong soft_ref_clock = java_lang_ref_SoftReference::clock(); assert(soft_ref_clock == _soft_ref_timestamp_clock, "soft ref clocks out of sync"); --- old/src/share/vm/utilities/globalDefinitions.hpp 2011-12-09 11:25:21.804964963 -0800 +++ new/src/share/vm/utilities/globalDefinitions.hpp 2011-12-09 11:25:21.573514132 -0800 @@ -175,6 +175,9 @@ const int MICROUNITS = 1000000; // micro units per base unit const int NANOUNITS = 1000000000; // nano units per base unit +const jlong NANOSECS_PER_SEC = CONST64(1000000000); +const jint NANOSECS_PER_MILLISEC = 1000000; + inline const char* proper_unit_for_byte_size(size_t s) { if (s >= 10*M) { return "M";