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add Machine::heapPool, allowing threads to acquire replacement heaps up to a point before forcing a GC

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This commit is contained in:
Joel Dice 2007-08-22 08:50:29 -06:00
parent 27c8511c5e
commit f148fd0668
2 changed files with 35 additions and 11 deletions
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31
src/machine.cpp
View File

@ -132,8 +132,6 @@ void
visitRoots(Thread* t, Heap::Visitor* v)
{
if (t->state != Thread::ZombieState) {
t->heapIndex = 0;
v->visit(&(t->javaThread));
v->visit(&(t->code));
v->visit(&(t->exception));
@ -362,11 +360,14 @@ void
postCollect(Thread* t)
{
#ifdef VM_STRESS
t->vm->system->free(t->heap);
t->heap = static_cast<object*>
t->vm->system->free(t->defaultHeap);
t->defaultHeap = static_cast<object*>
(t->vm->system->allocate(Thread::HeapSizeInBytes));
#endif
t->heap = t->defaultHeap;
t->heapIndex = 0;
if (t->large) {
t->vm->system->free(t->large);
t->large = 0;
@ -1289,7 +1290,8 @@ Machine::Machine(System* system, Heap* heap, Finder* finder):
finalizeQueue(0),
weakReferences(0),
tenuredWeakReferences(0),
unsafe(false)
unsafe(false),
heapPoolIndex(0)
{
populateJNITable(&jniEnvVTable);
@ -1335,8 +1337,9 @@ Thread::Thread(Machine* m, object javaThread, Thread* parent):
runnable(this)
#ifdef VM_STRESS
, stress(false),
heap(static_cast<object*>(m->system->allocate(HeapSizeInBytes)))
defaultHeap(static_cast<object*>(m->system->allocate(HeapSizeInBytes)))
#endif // VM_STRESS
, heap(defaultHeap)
{
if (parent == 0) {
assert(this, m->rootThread == 0);
@ -1613,9 +1616,20 @@ allocate2(Thread* t, unsigned sizeInBytes)
if (t->heapIndex + ceiling(sizeInBytes, BytesPerWord)
>= Thread::HeapSizeInWords)
{
t->heap = 0;
if (t->vm->heapPoolIndex < Machine::HeapPoolSize) {
t->heap = static_cast<object*>
(t->vm->system->tryAllocate(Thread::HeapSizeInBytes));
if (t->heap) {
t->vm->heapPool[t->vm->heapPoolIndex++] = t->heap;
}
}
if (t->heap == 0) {
ENTER(t, Thread::ExclusiveState);
collect(t, Heap::MinorCollection);
}
}
if (sizeInBytes > Thread::HeapSizeInBytes) {
return allocateLarge(t, sizeInBytes);
@ -2535,6 +2549,11 @@ collect(Thread* t, Heap::CollectionType type)
m->finalizeQueue = 0;
killZombies(t, m->rootThread);
for (unsigned i = 0; i < m->heapPoolIndex; ++i) {
m->system->free(m->heapPool[i]);
}
m->heapPoolIndex = 0;
}
void

11
src/machine.h
View File

@ -1098,6 +1098,8 @@ class Machine {
dispose();
}
static const unsigned HeapPoolSize = 16;
void dispose();
System* system;
@ -1125,6 +1127,8 @@ class Machine {
object tenuredWeakReferences;
bool unsafe;
JNIEnvVTable jniEnvVTable;
object* heapPool[HeapPoolSize];
unsigned heapPoolIndex;
};
object
@ -1193,7 +1197,7 @@ class Thread {
Thread* t;
};
static const unsigned HeapSizeInBytes = 512 * 1024;
static const unsigned HeapSizeInBytes = 64 * 1024;
static const unsigned StackSizeInBytes = 64 * 1024;
static const unsigned HeapSizeInWords = HeapSizeInBytes / BytesPerWord;
@ -1221,11 +1225,12 @@ class Thread {
unsigned heapIndex;
Protector* protector;
Runnable runnable;
object* heap;
#ifdef VM_STRESS
bool stress;
object* heap;
object* defaultHeap;
#else // not VM_STRESS
object heap[HeapSizeInWords];
object defaultHeap[HeapSizeInWords];
#endif // not VM_STRESS
uintptr_t stack[StackSizeInWords];
};