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src/share/vm/memory/permGen.cpp@0fbdb4381b99 (annotated)

src/share/vm/memory/permGen.cpp

Mon, 09 Mar 2009 13:28:46 -0700

author

xdono

date

Mon, 09 Mar 2009 13:28:46 -0700

changeset 1014

0fbdb4381b99

parent 915

d249b360e026

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6814575: Update copyright year
Summary: Update copyright for files that have been modified in 2009, up to 03/09
Reviewed-by: katleman, tbell, ohair

duke@435	1	/*
xdono@1014	2	* Copyright 2000-2009 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	#include "incls/_precompiled.incl"
duke@435	26	#include "incls/_permGen.cpp.incl"
duke@435	27
apetrusenko@574	28	HeapWord* PermGen::mem_allocate_in_gen(size_t size, Generation* gen) {
apetrusenko@574	29	GCCause::Cause next_cause = GCCause::_permanent_generation_full;
apetrusenko@574	30	GCCause::Cause prev_cause = GCCause::_no_gc;
ysr@915	31	unsigned int gc_count_before, full_gc_count_before;
ysr@915	32	HeapWord* obj;
apetrusenko@574	33
apetrusenko@574	34	for (;;) {
ysr@915	35	{
ysr@915	36	MutexLocker ml(Heap_lock);
ysr@915	37	if ((obj = gen->allocate(size, false)) != NULL) {
ysr@915	38	return obj;
ysr@915	39	}
ysr@915	40	if (gen->capacity() < _capacity_expansion_limit ||
ysr@915	41	prev_cause != GCCause::_no_gc) {
ysr@915	42	obj = gen->expand_and_allocate(size, false);
ysr@915	43	}
ysr@915	44	if (obj != NULL || prev_cause == GCCause::_last_ditch_collection) {
ysr@915	45	return obj;
ysr@915	46	}
apetrusenko@574	47	if (GC_locker::is_active_and_needs_gc()) {
apetrusenko@574	48	// If this thread is not in a jni critical section, we stall
apetrusenko@574	49	// the requestor until the critical section has cleared and
apetrusenko@574	50	// GC allowed. When the critical section clears, a GC is
apetrusenko@574	51	// initiated by the last thread exiting the critical section; so
apetrusenko@574	52	// we retry the allocation sequence from the beginning of the loop,
apetrusenko@574	53	// rather than causing more, now probably unnecessary, GC attempts.
apetrusenko@574	54	JavaThread* jthr = JavaThread::current();
apetrusenko@574	55	if (!jthr->in_critical()) {
apetrusenko@574	56	MutexUnlocker mul(Heap_lock);
apetrusenko@574	57	// Wait for JNI critical section to be exited
apetrusenko@574	58	GC_locker::stall_until_clear();
apetrusenko@574	59	continue;
apetrusenko@574	60	} else {
apetrusenko@574	61	if (CheckJNICalls) {
apetrusenko@574	62	fatal("Possible deadlock due to allocating while"
apetrusenko@574	63	" in jni critical section");
apetrusenko@574	64	}
apetrusenko@574	65	return NULL;
apetrusenko@574	66	}
apetrusenko@574	67	}
ysr@915	68	// Read the GC count while holding the Heap_lock
ysr@915	69	gc_count_before = SharedHeap::heap()->total_collections();
ysr@915	70	full_gc_count_before = SharedHeap::heap()->total_full_collections();
ysr@915	71	}
apetrusenko@574	72
ysr@915	73	// Give up heap lock above, VMThread::execute below gets it back
ysr@915	74	VM_GenCollectForPermanentAllocation op(size, gc_count_before, full_gc_count_before,
ysr@915	75	next_cause);
ysr@915	76	VMThread::execute(&op);
ysr@915	77	if (!op.prologue_succeeded() || op.gc_locked()) {
ysr@915	78	assert(op.result() == NULL, "must be NULL if gc_locked() is true");
ysr@915	79	continue; // retry and/or stall as necessary
ysr@915	80	}
ysr@915	81	obj = op.result();
ysr@915	82	assert(obj == NULL || SharedHeap::heap()->is_in_reserved(obj),
ysr@915	83	"result not in heap");
ysr@915	84	if (obj != NULL) {
apetrusenko@574	85	return obj;
apetrusenko@574	86	}
ysr@915	87	prev_cause = next_cause;
ysr@915	88	next_cause = GCCause::_last_ditch_collection;
apetrusenko@574	89	}
apetrusenko@574	90	}
apetrusenko@574	91
duke@435	92	CompactingPermGen::CompactingPermGen(ReservedSpace rs,
duke@435	93	ReservedSpace shared_rs,
duke@435	94	size_t initial_byte_size,
duke@435	95	GenRemSet* remset,
duke@435	96	PermanentGenerationSpec* perm_spec)
duke@435	97	{
duke@435	98	CompactingPermGenGen* g =
duke@435	99	new CompactingPermGenGen(rs, shared_rs, initial_byte_size, -1, remset,
duke@435	100	NULL, perm_spec);
duke@435	101	if (g == NULL)
duke@435	102	vm_exit_during_initialization("Could not allocate a CompactingPermGen");
duke@435	103	_gen = g;
duke@435	104
duke@435	105	g->initialize_performance_counters();
duke@435	106
duke@435	107	_capacity_expansion_limit = g->capacity() + MaxPermHeapExpansion;
duke@435	108	}
duke@435	109
duke@435	110	HeapWord* CompactingPermGen::mem_allocate(size_t size) {
apetrusenko@574	111	return mem_allocate_in_gen(size, _gen);
duke@435	112	}
duke@435	113
duke@435	114	void CompactingPermGen::compute_new_size() {
duke@435	115	size_t desired_capacity = align_size_up(_gen->used(), MinPermHeapExpansion);
duke@435	116	if (desired_capacity < PermSize) {
duke@435	117	desired_capacity = PermSize;
duke@435	118	}
duke@435	119	if (_gen->capacity() > desired_capacity) {
duke@435	120	_gen->shrink(_gen->capacity() - desired_capacity);
duke@435	121	}
duke@435	122	_capacity_expansion_limit = _gen->capacity() + MaxPermHeapExpansion;
duke@435	123	}