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src/share/vm/gc/g1/g1Allocator.cpp
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rev 8871 : [mq]: mikael-changes
@@ -22,10 +22,11 @@
*
*/
#include "precompiled.hpp"
#include "gc/g1/g1Allocator.inline.hpp"
+#include "gc/g1/g1AllocRegion.inline.hpp"
#include "gc/g1/g1CollectedHeap.inline.hpp"
#include "gc/g1/g1CollectorPolicy.hpp"
#include "gc/g1/g1MarkSweep.hpp"
#include "gc/g1/heapRegion.inline.hpp"
#include "gc/g1/heapRegionSet.inline.hpp"
@@ -141,15 +142,28 @@
}
HeapWord* G1Allocator::par_allocate_during_gc(InCSetState dest,
size_t word_size,
AllocationContext_t context) {
+ size_t temp = 0;
+ HeapWord* result = par_allocate_during_gc(dest, word_size, word_size, &temp, context);
+ assert(result == NULL || temp == word_size,
+ err_msg("Requested " SIZE_FORMAT " words, but got " SIZE_FORMAT " at " PTR_FORMAT,
+ word_size, temp, p2i(result)));
+ return result;
+}
+
+HeapWord* G1Allocator::par_allocate_during_gc(InCSetState dest,
+ size_t min_word_size,
+ size_t desired_word_size,
+ size_t* actual_word_size,
+ AllocationContext_t context) {
switch (dest.value()) {
case InCSetState::Young:
- return survivor_attempt_allocation(word_size, context);
+ return survivor_attempt_allocation(min_word_size, desired_word_size, actual_word_size, context);
case InCSetState::Old:
- return old_attempt_allocation(word_size, context);
+ return old_attempt_allocation(min_word_size, desired_word_size, actual_word_size, context);
default:
ShouldNotReachHere();
return NULL; // Keep some compilers happy
}
}
@@ -168,41 +182,53 @@
void G1Allocator::set_old_full(AllocationContext_t context) {
_old_is_full = true;
}
-HeapWord* G1Allocator::survivor_attempt_allocation(size_t word_size,
+HeapWord* G1Allocator::survivor_attempt_allocation(size_t min_word_size,
+ size_t desired_word_size,
+ size_t* actual_word_size,
AllocationContext_t context) {
- assert(!_g1h->is_humongous(word_size),
+ assert(!_g1h->is_humongous(desired_word_size),
"we should not be seeing humongous-size allocations in this path");
- HeapWord* result = survivor_gc_alloc_region(context)->attempt_allocation(word_size,
+ HeapWord* result = survivor_gc_alloc_region(context)->attempt_allocation(min_word_size,
+ desired_word_size,
+ actual_word_size,
false /* bot_updates */);
if (result == NULL && !survivor_is_full(context)) {
MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);
- result = survivor_gc_alloc_region(context)->attempt_allocation_locked(word_size,
+ result = survivor_gc_alloc_region(context)->attempt_allocation_locked(min_word_size,
+ desired_word_size,
+ actual_word_size,
false /* bot_updates */);
if (result == NULL) {
set_survivor_full(context);
}
}
if (result != NULL) {
- _g1h->dirty_young_block(result, word_size);
+ _g1h->dirty_young_block(result, *actual_word_size);
}
return result;
}
-HeapWord* G1Allocator::old_attempt_allocation(size_t word_size,
+HeapWord* G1Allocator::old_attempt_allocation(size_t min_word_size,
+ size_t desired_word_size,
+ size_t* actual_word_size,
AllocationContext_t context) {
- assert(!_g1h->is_humongous(word_size),
+ assert(!_g1h->is_humongous(desired_word_size),
"we should not be seeing humongous-size allocations in this path");
- HeapWord* result = old_gc_alloc_region(context)->attempt_allocation(word_size,
+ HeapWord* result = old_gc_alloc_region(context)->attempt_allocation(min_word_size,
+ desired_word_size,
+ actual_word_size,
true /* bot_updates */);
if (result == NULL && !old_is_full(context)) {
MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);
- result = old_gc_alloc_region(context)->attempt_allocation_locked(word_size,
+ result = old_gc_alloc_region(context)->attempt_allocation_locked(min_word_size,
+ desired_word_size,
+ actual_word_size,
true /* bot_updates */);
if (result == NULL) {
set_old_full(context);
}
}
@@ -240,14 +266,23 @@
may_throw_away_buffer(required_in_plab, plab_word_size)) {
G1PLAB* alloc_buf = alloc_buffer(dest, context);
alloc_buf->retire();
- HeapWord* buf = _allocator->par_allocate_during_gc(dest, plab_word_size, context);
+ size_t actual_plab_size = 0;
+ HeapWord* buf = _allocator->par_allocate_during_gc(dest,
+ required_in_plab,
+ plab_word_size,
+ &actual_plab_size,
+ context);
+
+ assert(buf == NULL || ((actual_plab_size >= required_in_plab) && (actual_plab_size <= plab_word_size)),
+ err_msg("Requested at minimum " SIZE_FORMAT ", desired " SIZE_FORMAT " words, but got " SIZE_FORMAT " at " PTR_FORMAT,
+ required_in_plab, plab_word_size, actual_plab_size, p2i(buf)));
+
if (buf != NULL) {
- // Otherwise.
- alloc_buf->set_buf(buf, plab_word_size);
+ alloc_buf->set_buf(buf, actual_plab_size);
HeapWord* const obj = alloc_buf->allocate(word_sz);
assert(obj != NULL, err_msg("PLAB should have been big enough, tried to allocate "
SIZE_FORMAT " requiring " SIZE_FORMAT " PLAB size " SIZE_FORMAT,
word_sz, required_in_plab, plab_word_size));
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