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src/share/vm/memory/threadLocalAllocBuffer.inline.hpp@167c2986d91b (annotated)

src/share/vm/memory/threadLocalAllocBuffer.inline.hpp

Wed, 16 Dec 2009 12:54:49 -0500

author

phh

date

Wed, 16 Dec 2009 12:54:49 -0500

changeset 1558

167c2986d91b

parent 435

a61af66fc99e

child 1600

2dd52dea6d28

permissions

-rw-r--r--

6843629: Make current hotspot build part of jdk5 control build
Summary: Source changes for older compilers plus makefile changes.
Reviewed-by: xlu

duke@435	1	/*
duke@435	2	* Copyright 1999-2007 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	inline HeapWord* ThreadLocalAllocBuffer::allocate(size_t size) {
duke@435	26	invariants();
duke@435	27	HeapWord* obj = top();
duke@435	28	if (pointer_delta(end(), obj) >= size) {
duke@435	29	// successful thread-local allocation
duke@435	30
duke@435	31	DEBUG_ONLY(Copy::fill_to_words(obj, size, badHeapWordVal));
duke@435	32	// This addition is safe because we know that top is
duke@435	33	// at least size below end, so the add can't wrap.
duke@435	34	set_top(obj + size);
duke@435	35
duke@435	36	invariants();
duke@435	37	return obj;
duke@435	38	}
duke@435	39	return NULL;
duke@435	40	}
duke@435	41
duke@435	42	inline size_t ThreadLocalAllocBuffer::compute_size(size_t obj_size) {
duke@435	43	const size_t aligned_obj_size = align_object_size(obj_size);
duke@435	44
duke@435	45	// Compute the size for the new TLAB.
duke@435	46	// The "last" tlab may be smaller to reduce fragmentation.
duke@435	47	// unsafe_max_tlab_alloc is just a hint.
duke@435	48	const size_t available_size = Universe::heap()->unsafe_max_tlab_alloc(myThread()) /
duke@435	49	HeapWordSize;
duke@435	50	size_t new_tlab_size = MIN2(available_size, desired_size() + aligned_obj_size);
duke@435	51
duke@435	52	// Make sure there's enough room for object and filler int[].
duke@435	53	const size_t obj_plus_filler_size = aligned_obj_size + alignment_reserve();
duke@435	54	if (new_tlab_size < obj_plus_filler_size) {
duke@435	55	// If there isn't enough room for the allocation, return failure.
duke@435	56	if (PrintTLAB && Verbose) {
duke@435	57	gclog_or_tty->print_cr("ThreadLocalAllocBuffer::compute_size(" SIZE_FORMAT ")"
duke@435	58	" returns failure",
duke@435	59	obj_size);
duke@435	60	}
duke@435	61	return 0;
duke@435	62	}
duke@435	63	if (PrintTLAB && Verbose) {
duke@435	64	gclog_or_tty->print_cr("ThreadLocalAllocBuffer::compute_size(" SIZE_FORMAT ")"
duke@435	65	" returns " SIZE_FORMAT,
duke@435	66	obj_size, new_tlab_size);
duke@435	67	}
duke@435	68	return new_tlab_size;
duke@435	69	}
duke@435	70
duke@435	71
duke@435	72	void ThreadLocalAllocBuffer::record_slow_allocation(size_t obj_size) {
duke@435	73	// Raise size required to bypass TLAB next time. Why? Else there's
duke@435	74	// a risk that a thread that repeatedly allocates objects of one
duke@435	75	// size will get stuck on this slow path.
duke@435	76
duke@435	77	set_refill_waste_limit(refill_waste_limit() + refill_waste_limit_increment());
duke@435	78
duke@435	79	_slow_allocations++;
duke@435	80
duke@435	81	if (PrintTLAB && Verbose) {
duke@435	82	Thread* thrd = myThread();
duke@435	83	gclog_or_tty->print("TLAB: %s thread: "INTPTR_FORMAT" [id: %2d]"
duke@435	84	" obj: "SIZE_FORMAT
duke@435	85	" free: "SIZE_FORMAT
duke@435	86	" waste: "SIZE_FORMAT"\n",
duke@435	87	"slow", thrd, thrd->osthread()->thread_id(),
duke@435	88	obj_size, free(), refill_waste_limit());
duke@435	89	}
duke@435	90	}