infernap12/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2026-05-16 00:19:27 +00:00
Code Issues Packages Projects Releases Wiki Activity

8221751: Shenandoah: Improve SATB enqueueing

Browse Source 
Reviewed-by: shade
This commit is contained in:
Roman Kennke 2019-04-02 18:13:42 +02:00
parent e676e93536
commit 9acdfbd5b7
6 changed files with 73 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
src/hotspot/cpu/aarch64/gc/shenandoah/shenandoahBarrierSetAssembler_aarch64.cpp
View File

@ -46,7 +46,18 @@ void ShenandoahBarrierSetAssembler::arraycopy_prologue(MacroAssembler* masm, Dec
Register addr, Register count, RegSet saved_regs) {
if (is_oop) {
bool dest_uninitialized = (decorators & IS_DEST_UNINITIALIZED) != 0;
if (!dest_uninitialized && !ShenandoahHeap::heap()->heuristics()->can_do_traversal_gc()) {
if (ShenandoahSATBBarrier && !dest_uninitialized && !ShenandoahHeap::heap()->heuristics()->can_do_traversal_gc()) {
Label done;
// Avoid calling runtime if count == 0
__ cbz(count, done);
// Is marking active?
Address gc_state(rthread, in_bytes(ShenandoahThreadLocalData::gc_state_offset()));
__ ldrb(rscratch1, gc_state);
__ tbz(rscratch1, ShenandoahHeap::MARKING_BITPOS, done);
__ push(saved_regs, sp);
if (count == c_rarg0) {
if (addr == c_rarg1) {
@ -68,6 +79,7 @@ void ShenandoahBarrierSetAssembler::arraycopy_prologue(MacroAssembler* masm, Dec
__ call_VM_leaf(CAST_FROM_FN_PTR(address, ShenandoahRuntime::write_ref_array_pre_oop_entry), 2);
}
__ pop(saved_regs, sp);
__ bind(done);
}
}
}

25
src/hotspot/cpu/x86/gc/shenandoah/shenandoahBarrierSetAssembler_x86.cpp
View File

@ -66,26 +66,22 @@ void ShenandoahBarrierSetAssembler::arraycopy_prologue(MacroAssembler* masm, Dec
}
#endif
if (!dest_uninitialized && !ShenandoahHeap::heap()->heuristics()->can_do_traversal_gc()) {
if (ShenandoahSATBBarrier && !dest_uninitialized && !ShenandoahHeap::heap()->heuristics()->can_do_traversal_gc()) {
Register thread = NOT_LP64(rax) LP64_ONLY(r15_thread);
#ifndef _LP64
__ push(thread);
__ get_thread(thread);
#endif
Label filtered;
Address in_progress(thread, in_bytes(ShenandoahThreadLocalData::satb_mark_queue_active_offset()));
// Is marking active?
if (in_bytes(SATBMarkQueue::byte_width_of_active()) == 4) {
__ cmpl(in_progress, 0);
} else {
assert(in_bytes(SATBMarkQueue::byte_width_of_active()) == 1, "Assumption");
__ cmpb(in_progress, 0);
}
Label done;
// Short-circuit if count == 0.
__ testptr(count, count);
__ jcc(Assembler::zero, done);
NOT_LP64(__ pop(thread);)
__ jcc(Assembler::equal, filtered);
// Avoid runtime call when not marking.
Address gc_state(thread, in_bytes(ShenandoahThreadLocalData::gc_state_offset()));
__ testb(gc_state, ShenandoahHeap::MARKING);
__ jcc(Assembler::zero, done);
__ pusha(); // push registers
#ifdef _LP64
@ -111,7 +107,8 @@ void ShenandoahBarrierSetAssembler::arraycopy_prologue(MacroAssembler* masm, Dec
dst, count);
#endif
__ popa();
__ bind(filtered);
__ bind(done);
NOT_LP64(__ pop(thread);)
}
}

35
src/hotspot/share/gc/shenandoah/shenandoahBarrierSet.cpp
View File

@ -132,12 +132,23 @@ void ShenandoahBarrierSet::write_ref_array(HeapWord* start, size_t count) {
template <class T>
void ShenandoahBarrierSet::write_ref_array_pre_work(T* dst, size_t count) {
shenandoah_assert_not_in_cset_loc_except(dst, _heap->cancelled_gc());
if (ShenandoahSATBBarrier && _heap->is_concurrent_mark_in_progress()) {
T* elem_ptr = dst;
for (size_t i = 0; i < count; i++, elem_ptr++) {
T heap_oop = RawAccess<>::oop_load(elem_ptr);
if (!CompressedOops::is_null(heap_oop)) {
enqueue(CompressedOops::decode_not_null(heap_oop));
assert(ShenandoahThreadLocalData::satb_mark_queue(Thread::current()).is_active(), "Shouldn't be here otherwise");
assert(ShenandoahSATBBarrier, "Shouldn't be here otherwise");
assert(count > 0, "Should have been filtered before");
Thread* thread = Thread::current();
ShenandoahMarkingContext* ctx = _heap->marking_context();
bool has_forwarded = _heap->has_forwarded_objects();
T* elem_ptr = dst;
for (size_t i = 0; i < count; i++, elem_ptr++) {
T heap_oop = RawAccess<>::oop_load(elem_ptr);
if (!CompressedOops::is_null(heap_oop)) {
oop obj = CompressedOops::decode_not_null(heap_oop);
if (has_forwarded) {
obj = resolve_forwarded_not_null(obj);
}
if (!ctx->is_marked(obj)) {
ShenandoahThreadLocalData::satb_mark_queue(thread).enqueue_known_active(obj);
}
}
}
@ -309,11 +320,9 @@ oop ShenandoahBarrierSet::write_barrier(oop obj) {
}
oop ShenandoahBarrierSet::storeval_barrier(oop obj) {
if (ShenandoahStoreValEnqueueBarrier) {
if (!CompressedOops::is_null(obj)) {
obj = write_barrier(obj);
enqueue(obj);
}
if (ShenandoahStoreValEnqueueBarrier && !CompressedOops::is_null(obj) && _heap->is_concurrent_traversal_in_progress()) {
obj = write_barrier(obj);
enqueue(obj);
}
if (ShenandoahStoreValReadBarrier) {
obj = resolve_forwarded(obj);
@ -329,14 +338,14 @@ void ShenandoahBarrierSet::keep_alive_barrier(oop obj) {
void ShenandoahBarrierSet::enqueue(oop obj) {
shenandoah_assert_not_forwarded_if(NULL, obj, _heap->is_concurrent_traversal_in_progress());
if (!_satb_mark_queue_set.is_active()) return;
assert(_satb_mark_queue_set.is_active(), "only get here when SATB active");
// Filter marked objects before hitting the SATB queues. The same predicate would
// be used by SATBMQ::filter to eliminate already marked objects downstream, but
// filtering here helps to avoid wasteful SATB queueing work to begin with.
if (!_heap->requires_marking<false>(obj)) return;
ShenandoahThreadLocalData::satb_mark_queue(Thread::current()).enqueue(obj);
ShenandoahThreadLocalData::satb_mark_queue(Thread::current()).enqueue_known_active(obj);
}
void ShenandoahBarrierSet::on_thread_create(Thread* thread) {

2
src/hotspot/share/gc/shenandoah/shenandoahBarrierSet.hpp
View File

@ -141,7 +141,7 @@ private:
bool arraycopy_loop(T* src, T* dst, size_t length, Klass* bound, bool disjoint);
template <typename T, bool CHECKCAST, bool SATB, ShenandoahBarrierSet::ArrayCopyStoreValMode STOREVAL_MODE>
bool arraycopy_element(T* cur_src, T* cur_dst, Klass* bound, Thread* thread);
bool arraycopy_element(T* cur_src, T* cur_dst, Klass* bound, Thread* const thread, ShenandoahMarkingContext* const ctx);
public:
// Callbacks for runtime accesses.

31
src/hotspot/share/gc/shenandoah/shenandoahBarrierSet.inline.hpp
View File

@ -28,6 +28,9 @@
#include "gc/shenandoah/shenandoahBarrierSet.hpp"
#include "gc/shenandoah/shenandoahBrooksPointer.inline.hpp"
#include "gc/shenandoah/shenandoahHeap.inline.hpp"
#include "gc/shenandoah/shenandoahHeapRegion.hpp"
#include "gc/shenandoah/shenandoahMarkingContext.inline.hpp"
#include "gc/shenandoah/shenandoahThreadLocalData.hpp"
bool ShenandoahBarrierSet::need_update_refs_barrier() {
return _heap->is_update_refs_in_progress() ||
@ -59,7 +62,8 @@ inline oop ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_ato
} while ((! oopDesc::equals_raw(compare_value, expected)) && oopDesc::equals_raw(resolve_forwarded(compare_value), resolve_forwarded(expected)));
if (oopDesc::equals_raw(expected, compare_value)) {
const bool keep_alive = (decorators & AS_NO_KEEPALIVE) == 0;
if (keep_alive && ShenandoahSATBBarrier && !CompressedOops::is_null(compare_value)) {
if (keep_alive && ShenandoahSATBBarrier && !CompressedOops::is_null(compare_value) &&
ShenandoahHeap::heap()->is_concurrent_mark_in_progress()) {
ShenandoahBarrierSet::barrier_set()->enqueue(compare_value);
}
}
@ -72,7 +76,8 @@ inline oop ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_ato
oop previous = Raw::oop_atomic_xchg(new_value, addr);
if (ShenandoahSATBBarrier) {
const bool keep_alive = (decorators & AS_NO_KEEPALIVE) == 0;
if (keep_alive && !CompressedOops::is_null(previous)) {
if (keep_alive && !CompressedOops::is_null(previous) &&
ShenandoahHeap::heap()->is_concurrent_mark_in_progress()) {
ShenandoahBarrierSet::barrier_set()->enqueue(previous);
}
}
@ -134,7 +139,7 @@ bool ShenandoahBarrierSet::arraycopy_loop_3(T* src, T* dst, size_t length, Klass
template <typename T, bool CHECKCAST, bool SATB, ShenandoahBarrierSet::ArrayCopyStoreValMode STOREVAL_MODE>
bool ShenandoahBarrierSet::arraycopy_loop(T* src, T* dst, size_t length, Klass* bound, bool disjoint) {
Thread* thread = Thread::current();
ShenandoahMarkingContext* ctx = _heap->marking_context();
ShenandoahEvacOOMScope oom_evac_scope;
// We need to handle four cases:
@ -161,7 +166,7 @@ bool ShenandoahBarrierSet::arraycopy_loop(T* src, T* dst, size_t length, Klass*
T* cur_dst = dst;
T* src_end = src + length;
for (; cur_src < src_end; cur_src++, cur_dst++) {
if (!arraycopy_element<T, CHECKCAST, SATB, STOREVAL_MODE>(cur_src, cur_dst, bound, thread)) {
if (!arraycopy_element<T, CHECKCAST, SATB, STOREVAL_MODE>(cur_src, cur_dst, bound, thread, ctx)) {
return false;
}
}
@ -170,7 +175,7 @@ bool ShenandoahBarrierSet::arraycopy_loop(T* src, T* dst, size_t length, Klass*
T* cur_src = src + length - 1;
T* cur_dst = dst + length - 1;
for (; cur_src >= src; cur_src--, cur_dst--) {
if (!arraycopy_element<T, CHECKCAST, SATB, STOREVAL_MODE>(cur_src, cur_dst, bound, thread)) {
if (!arraycopy_element<T, CHECKCAST, SATB, STOREVAL_MODE>(cur_src, cur_dst, bound, thread, ctx)) {
return false;
}
}
@ -179,14 +184,26 @@ bool ShenandoahBarrierSet::arraycopy_loop(T* src, T* dst, size_t length, Klass*
}
template <typename T, bool CHECKCAST, bool SATB, ShenandoahBarrierSet::ArrayCopyStoreValMode STOREVAL_MODE>
bool ShenandoahBarrierSet::arraycopy_element(T* cur_src, T* cur_dst, Klass* bound, Thread* thread) {
bool ShenandoahBarrierSet::arraycopy_element(T* cur_src, T* cur_dst, Klass* bound, Thread* const thread, ShenandoahMarkingContext* const ctx) {
T o = RawAccess<>::oop_load(cur_src);
if (SATB) {
assert(ShenandoahThreadLocalData::satb_mark_queue(thread).is_active(), "Shouldn't be here otherwise");
T prev = RawAccess<>::oop_load(cur_dst);
if (!CompressedOops::is_null(prev)) {
oop prev_obj = CompressedOops::decode_not_null(prev);
enqueue(prev_obj);
switch (STOREVAL_MODE) {
case NONE:
break;
case READ_BARRIER:
case WRITE_BARRIER:
// The write-barrier case cannot really happen. It's traversal-only and traversal
// doesn't currently use SATB. And even if it did, it would not be fatal to just do the normal RB here.
prev_obj = ShenandoahBarrierSet::resolve_forwarded_not_null(prev_obj);
}
if (!ctx->is_marked(prev_obj)) {
ShenandoahThreadLocalData::satb_mark_queue(thread).enqueue_known_active(prev_obj);
}
}
}

3
src/hotspot/share/gc/shenandoah/shenandoahRuntime.cpp
View File

@ -51,7 +51,8 @@ JRT_LEAF(void, ShenandoahRuntime::write_ref_field_pre_entry(oopDesc* orig, JavaT
}
shenandoah_assert_correct(NULL, orig);
// store the original value that was in the field reference
ShenandoahThreadLocalData::satb_mark_queue(thread).enqueue(orig);
assert(ShenandoahThreadLocalData::satb_mark_queue(thread).is_active(), "Shouldn't be here otherwise");
ShenandoahThreadLocalData::satb_mark_queue(thread).enqueue_known_active(orig);
JRT_END
JRT_LEAF(oopDesc*, ShenandoahRuntime::write_barrier_JRT(oopDesc* src))