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only enter IdleState if necessary in idleIfNecessary

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There's no need to enter IdleState (and incur synchronization
overhead) unless another thread is waiting to enter ExclusiveState.
This change improves the performance of the MemoryRamp test by a
factor of about 100.
This commit is contained in:
Joel Dice 2014-06-05 07:49:49 -06:00
parent 40b78d888d
commit b16dd4e63f
2 changed files with 6 additions and 2 deletions
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4
src/compile.cpp
View File

@ -2981,7 +2981,9 @@ gcIfNecessary(MyThread* t)
void idleIfNecessary(MyThread* t)
{
ENTER(t, Thread::IdleState);
if (UNLIKELY(t->m->exclusive)) {
ENTER(t, Thread::IdleState);
}
}
unsigned

4
src/interpret.cpp
View File

@ -768,7 +768,9 @@ pushField(Thread* t, object target, object field)
}
void safePoint(Thread* t) {
ENTER(t, Thread::IdleState);
if (UNLIKELY(t->m->exclusive)) {
ENTER(t, Thread::IdleState);
}
}
object