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This commit is contained in:
Vladimir Ivanov 2015-02-12 13:55:54 -08:00
commit a1b368700b
32 changed files with 478 additions and 132 deletions
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33
hotspot/src/share/vm/runtime/arguments.cpp
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@ -1114,34 +1114,39 @@ static void no_shared_spaces(const char* message) {
}
#endif
// Returns threshold scaled with the value of scale.
// If scale < 0.0, threshold is returned without scaling.
intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
if (scale == 1.0 || scale <= 0.0) {
if (scale == 1.0 || scale < 0.0) {
return threshold;
} else {
return (intx)(threshold * scale);
}
}
// Returns freq_log scaled with CompileThresholdScaling
// Returns freq_log scaled with the value of scale.
// Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
// If scale < 0.0, freq_log is returned without scaling.
intx Arguments::scaled_freq_log(intx freq_log, double scale) {
// Check if scaling is necessary or negative value was specified.
// Check if scaling is necessary or if negative value was specified.
if (scale == 1.0 || scale < 0.0) {
return freq_log;
}
// Check value to avoid calculating log2 of 0.
if (scale == 0.0) {
return freq_log;
// Check values to avoid calculating log2 of 0.
if (scale == 0.0 || freq_log == 0) {
return 0;
}
intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
// Determine the maximum notification frequency value currently supported.
// The largest mask value that the interpreter/C1 can handle is
// of length InvocationCounter::number_of_count_bits. Mask values are always
// one bit shorter then the value of the notification frequency. Set
// max_freq_bits accordingly.
intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
if (scaled_freq > nth_bit(max_freq_bits)) {
intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
if (scaled_freq == 0) {
// Return 0 right away to avoid calculating log2 of 0.
return 0;
} else if (scaled_freq > nth_bit(max_freq_bits)) {
return max_freq_bits;
} else {
return log2_intptr(scaled_freq);
@ -1192,8 +1197,9 @@ void Arguments::set_tiered_flags() {
vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
}
// Scale tiered compilation thresholds
if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
// Scale tiered compilation thresholds.
// CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
@ -3912,7 +3918,8 @@ jint Arguments::apply_ergo() {
"Incompatible compilation policy selected", NULL);
}
// Scale CompileThreshold
if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
// CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
}
}