Notes for xx_use_serialgc

-XX:+UseSerialGC

rough memos

minor gc で eden/from から to に copy する辺りのスタックトレース

DefNewGeneration::copy_to_survivor_space(oopDesc*) ()
FastScanClosure::do_oop(oopDesc**) ()
Universe::oops_do(OopClosure*, bool) ()
SharedHeap::process_strong_roots(bool, bool, SharedHeap::
ScanningOption, OopClosure*, CodeBlobClosure*, OopsInGenClosure*) ()
GenCollectedHeap::gen_process_strong_roots(int, bool, bool, bool,
SharedHeap::ScanningOption, OopsInGenClosure*, bool,
OopsInGenClosure*) ()
DefNewGeneration::collect(bool, bool, unsigned int, bool) ()
GenCollectedHeap::do_collection(bool, bool, unsigned int, bool, int) ()
GenCollectorPolicy::satisfy_failed_allocation(unsigned int, bool) ()
GenCollectedHeap::satisfy_failed_allocation(unsigned int, bool) ()
VM_GenCollectForAllocation::doit() ()
VM_Operation::evaluate() ()
VMThread::evaluate_operation(VM_Operation*) ()
VMThread::loop() ()
VMThread::run() ()
java_start(Thread*) ()

Java heap からのメモリ取得に失敗し、VMThread に GC を依頼したスレッド。GC 終了まで
待つ。
#1 0x00ddd48c in pthread_cond_wait@@GLIBC_2.3.2 ()
#2 0x01310524 in os::PlatformEvent::park() ()
#3 0x012e80f8 in Monitor::IWait(Thread*, long long) ()
#4 0x012e88c3 in Monitor::wait(bool, long, bool) ()
#5 0x0144a064 in VMThread::execute(VM_Operation*) ()
#6 0x010396ef in GenCollectorPolicy::mem_allocate_work(unsigned int, bool, bool*) ()
#7 0x0110f83c in GenCollectedHeap::mem_allocate(unsigned int, bool, bool, bool*) ()
#8 0x0114c379 in instanceKlass::allocate_instance(Thread*) ()
#9 0x0137a0c5 in OptoRuntime::new_instance_C(klassOopDesc*, JavaThread*) ()
#10 0xb489d909 in ?? ()
#11 0x00000000 in ?? ()

void DefNewGeneration::collect(bool full,
bool clear_all_soft_refs,
size_t size,
bool is_tlab) {
:
age_table clear
to clear
:
gch->gen_process_strong_roots
evacuate_followers.do_void
if !promotion_failed
eden clear
from clear
:
swap_spaces
_tenuring_threshold = ...
else
:
swap-spaces
gch->set_incremental_collection_will_fail
_next_gen->promotion_failure_occurred

Full GC の最中のスタックトレース

GenMarkSweep::mark_sweep_phase4() ()
GenMarkSweep::invoke_at_safepoint(int, ReferenceProcessor*, bool) ()
OneContigSpaceCardGeneration::collect(bool, bool, unsigned int, bool) ()
TenuredGeneration::collect(bool, bool, unsigned int, bool) ()
GenCollectedHeap::do_collection(bool, bool, unsigned int, bool, int) ()
GenCollectorPolicy::satisfy_failed_allocation(unsigned int, bool) ()
GenCollectedHeap::satisfy_failed_allocation(unsigned int, bool) ()
VM_GenCollectForAllocation::doit() ()
VM_Operation::evaluate() ()
VMThread::evaluate_operation(VM_Operation*) ()
VMThread::loop() ()
VMThread::run() ()

void TenuredGeneration::collect(bool full,
size_t size,
bool is_tlab) {
retire_alloc_buffers_before_full_gc
OneContigSpaceCardGeneration::collect(full, clear_all_soft_refs,
size, is_tlab)
}

void OneContigSpaceCardGeneration::collect(bool full,
size_t size,
bool is_tlab) {
SpecializationStats clear();

...
GenMarkSweep::invoke_at_safepoint(_level, ref_processor(), clear_all_soft_refs);
...
}

void GenMarkSweep::invoke_at_safepoint(int level, ReferenceProcessor* rp, bool
clear_all_softrefs)
:
mark_sweep_phase1
mark_sweep_phase2
mark_sweep_phase3
mark_sweep_phase4

void GenMarkSweep::mark_sweep_phase1(int level,
bool clear_all_softrefs) {
:
GenCollectedHeap* gch = GenCollectedHeap::heap();
:
gch->gen_process_strong_roots(level,
false, // Younger gens are not roots.
true, // activate StrongRootsScope
true, // Collecting permanent generation.
SharedHeap::SO_SystemClasses,
&follow_root_closure,
true, // walk code active on stacks
&follow_root_closure);

java class をあらわすデータ構造 method area (perm) にある。

class instanceKlass klassOopDesc 0x9c false
field instanceKlass _array_klasses 0 4 klassOop
field instanceKlass _methods 4 4 objArrayOop
:
field instanceKlass _fields 0x14 4 typeArrayOop
field instanceKlass _constants 0x18 4 constantPoolOop
field instanceKlass _class_loader 0x1c 4 oop
field instanceKlass _protection_domain 0x20 4 oop
field instanceKlass _signers 0x24 4 objArrayOop
field instanceKlass _source_file_name 0x28 4 symbolOop

field instanceKlass _inner_classes 0x30 4 typeArrayOop
field instanceKlass _implementor 0x34 4 klassOop
field instanceKlass _generic_signature 0x38 4 symbolOop
field instanceKlass _class_annotations 0x3c 4 typeArrayOop
field instanceKlass _fields_annotations 0x40 4 objArrayOop
field instanceKlass _methods_annotations 0x44 4 objArrayOop
field instanceKlass _methods_parameter_annotations 0x48 4 objArrayOop
field instanceKlass _methods_default_annotations 0x4c 4 objArrayOop

*Klass 系の物の先頭にある部分

class Klass Klass_vtbl 0x54 true
field Klass _super_check_offset 0 4 juint
:
field Klass _primary_supers 0xc 0x20 klassOop[8]
field Klass _size_helper 0x2c 4 int
field Klass _java_mirror 0x30 4 oop
field Klass _modifier_flags 0x34 4 jint
field Klass _super 0x38 4 klassOop
field Klass _name 0x3c 4 symbolOop
field Klass _access_flags 0x40 4 AccessFlags
field Klass _subklass 0x44 4 klassOop
field Klass _next_sibling 0x48 4 klassOop
field Klass _alloc_count 0x4c 4 juint
field Klass _is_objArray 0x50 1 bool

メソッドを表すクラス

class methodOopDesc oopDesc 0x58 false
field methodOopDesc _constMethod 0 4 constMethodOop
field methodOopDesc _constants 4 4 constantPoolOop
field methodOopDesc _method_data 8 4 methodDataOop
field methodOopDesc _interpreter_invocation_count 0xc 4 int
field methodOopDesc _access_flags 0x10 4 AccessFlags
field methodOopDesc _vtable_index 0x14 4 int
:
field methodOopDesc _method_size 0x18 2 u2
field methodOopDesc _max_stack 0x1a 2 u2
field methodOopDesc _max_locals 0x1c 2 u2
field methodOopDesc _size_of_parameters 0x1e 2 u2
:
field methodOopDesc _i2i_entry 0x40 4 address
field methodOopDesc _adapter 0x44 4 AdapterHandlerEntry*
field methodOopDesc _from_compiled_entry 0x48 4 address
field methodOopDesc _code 0x4c 4 nmethod*
field methodOopDesc _from_interpreted_entry 0x50 4 address

Notes for xx_use_serialgc

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Notes for xx_use_serialgc