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8191471: Elastic TLABs for G1

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Reviewed-by: tschatzl, pliden
This commit is contained in:
Stefan Johansson 2018-05-02 13:44:46 +02:00
parent 8e69e1b11f
commit 7f7d103c85
16 changed files with 268 additions and 77 deletions
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12
src/hotspot/share/gc/shared/threadLocalAllocBuffer.inline.hpp
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@ -54,18 +54,15 @@ inline HeapWord* ThreadLocalAllocBuffer::allocate(size_t size) {
}
inline size_t ThreadLocalAllocBuffer::compute_size(size_t obj_size) {
const size_t aligned_obj_size = align_object_size(obj_size);
// Compute the size for the new TLAB.
// The "last" tlab may be smaller to reduce fragmentation.
// unsafe_max_tlab_alloc is just a hint.
const size_t available_size = Universe::heap()->unsafe_max_tlab_alloc(myThread()) /
HeapWordSize;
size_t new_tlab_size = MIN3(available_size, desired_size() + aligned_obj_size, max_size());
size_t new_tlab_size = MIN3(available_size, desired_size() + align_object_size(obj_size), max_size());
// Make sure there's enough room for object and filler int[].
const size_t obj_plus_filler_size = aligned_obj_size + alignment_reserve();
if (new_tlab_size < obj_plus_filler_size) {
if (new_tlab_size < compute_min_size(obj_size)) {
// If there isn't enough room for the allocation, return failure.
log_trace(gc, tlab)("ThreadLocalAllocBuffer::compute_size(" SIZE_FORMAT ") returns failure",
obj_size);
@ -76,6 +73,11 @@ inline size_t ThreadLocalAllocBuffer::compute_size(size_t obj_size) {
return new_tlab_size;
}
inline size_t ThreadLocalAllocBuffer::compute_min_size(size_t obj_size) {
const size_t aligned_obj_size = align_object_size(obj_size);
const size_t size_with_reserve = aligned_obj_size + alignment_reserve();
return MAX2(size_with_reserve, MinTLABSize);
}
void ThreadLocalAllocBuffer::record_slow_allocation(size_t obj_size) {
// Raise size required to bypass TLAB next time. Why? Else there's