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src/share/vm/code/codeCache.hpp@a7fb14888912 (annotated)

src/share/vm/code/codeCache.hpp

Thu, 11 Apr 2013 13:57:44 +0200

author

neliasso

date

Thu, 11 Apr 2013 13:57:44 +0200

changeset 4952

a7fb14888912

parent 4864

3c786355ffb4

child 5038

0cfa93c2fcc4

permissions

-rw-r--r--

8006952: Slow VM due to excessive code cache freelist iteration
Summary: Remove continous free block requirement
Reviewed-by: kvn

duke@435	1	/*
coleenp@4037	2	* Copyright (c) 1997, 2012, Oracle and/or its affiliates. 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	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#ifndef SHARE_VM_CODE_CODECACHE_HPP
stefank@2314	26	#define SHARE_VM_CODE_CODECACHE_HPP
stefank@2314	27
stefank@2314	28	#include "code/codeBlob.hpp"
stefank@2314	29	#include "memory/allocation.hpp"
stefank@2314	30	#include "memory/heap.hpp"
stefank@2314	31	#include "oops/instanceKlass.hpp"
stefank@2314	32	#include "oops/oopsHierarchy.hpp"
stefank@2314	33
duke@435	34	// The CodeCache implements the code cache for various pieces of generated
duke@435	35	// code, e.g., compiled java methods, runtime stubs, transition frames, etc.
duke@435	36	// The entries in the CodeCache are all CodeBlob's.
duke@435	37
duke@435	38	// Implementation:
duke@435	39	// - Each CodeBlob occupies one chunk of memory.
duke@435	40	// - Like the offset table in oldspace the zone has at table for
duke@435	41	// locating a method given a addess of an instruction.
duke@435	42
duke@435	43	class OopClosure;
duke@435	44	class DepChange;
duke@435	45
duke@435	46	class CodeCache : AllStatic {
duke@435	47	friend class VMStructs;
duke@435	48	private:
duke@435	49	// CodeHeap is malloc()'ed at startup and never deleted during shutdown,
duke@435	50	// so that the generated assembly code is always there when it's needed.
duke@435	51	// This may cause memory leak, but is necessary, for now. See 4423824,
duke@435	52	// 4422213 or 4436291 for details.
duke@435	53	static CodeHeap * _heap;
duke@435	54	static int _number_of_blobs;
never@1999	55	static int _number_of_adapters;
never@1999	56	static int _number_of_nmethods;
duke@435	57	static int _number_of_nmethods_with_dependencies;
duke@435	58	static bool _needs_cache_clean;
jrose@1424	59	static nmethod* _scavenge_root_nmethods; // linked via nm->scavenge_root_link()
kvn@1637	60	static nmethod* _saved_nmethods; // linked via nm->saved_nmethod_look()
duke@435	61
duke@435	62	static void verify_if_often() PRODUCT_RETURN;
jrose@1424	63
jrose@1424	64	static void mark_scavenge_root_nmethods() PRODUCT_RETURN;
jrose@1424	65	static void verify_perm_nmethods(CodeBlobClosure* f_or_null) PRODUCT_RETURN;
jrose@1424	66
duke@435	67	public:
duke@435	68
duke@435	69	// Initialization
duke@435	70	static void initialize();
duke@435	71
duke@435	72	// Allocation/administration
neliasso@4952	73	static CodeBlob* allocate(int size, bool is_critical = false); // allocates a new CodeBlob
duke@435	74	static void commit(CodeBlob* cb); // called when the allocated CodeBlob has been filled
duke@435	75	static int alignment_unit(); // guaranteed alignment of all CodeBlobs
duke@435	76	static int alignment_offset(); // guaranteed offset of first CodeBlob byte within alignment unit (i.e., allocation header)
duke@435	77	static void free(CodeBlob* cb); // frees a CodeBlob
duke@435	78	static void flush(); // flushes all CodeBlobs
duke@435	79	static bool contains(void *p); // returns whether p is included
duke@435	80	static void blobs_do(void f(CodeBlob* cb)); // iterates over all CodeBlobs
jrose@1424	81	static void blobs_do(CodeBlobClosure* f); // iterates over all CodeBlobs
duke@435	82	static void nmethods_do(void f(nmethod* nm)); // iterates over all nmethods
coleenp@4037	83	static void alive_nmethods_do(void f(nmethod* nm)); // iterates over all alive nmethods
duke@435	84
duke@435	85	// Lookup
duke@435	86	static CodeBlob* find_blob(void* start);
duke@435	87	static nmethod* find_nmethod(void* start);
duke@435	88
duke@435	89	// Lookup that does not fail if you lookup a zombie method (if you call this, be sure to know
duke@435	90	// what you are doing)
duke@435	91	static CodeBlob* find_blob_unsafe(void* start) {
zgu@3900	92	// NMT can walk the stack before code cache is created
zgu@3900	93	if (_heap == NULL) return NULL;
zgu@3900	94
duke@435	95	CodeBlob* result = (CodeBlob*)_heap->find_start(start);
sgoldman@542	96	// this assert is too strong because the heap code will return the
sgoldman@542	97	// heapblock containing start. That block can often be larger than
sgoldman@542	98	// the codeBlob itself. If you look up an address that is within
sgoldman@542	99	// the heapblock but not in the codeBlob you will assert.
sgoldman@542	100	//
sgoldman@542	101	// Most things will not lookup such bad addresses. However
sgoldman@542	102	// AsyncGetCallTrace can see intermediate frames and get that kind
sgoldman@542	103	// of invalid address and so can a developer using hsfind.
sgoldman@542	104	//
sgoldman@542	105	// The more correct answer is to return NULL if blob_contains() returns
sgoldman@542	106	// false.
sgoldman@542	107	// assert(result == NULL || result->blob_contains((address)start), "found wrong CodeBlob");
sgoldman@542	108
sgoldman@542	109	if (result != NULL && !result->blob_contains((address)start)) {
sgoldman@542	110	result = NULL;
sgoldman@542	111	}
duke@435	112	return result;
duke@435	113	}
duke@435	114
duke@435	115	// Iteration
duke@435	116	static CodeBlob* first();
duke@435	117	static CodeBlob* next (CodeBlob* cb);
duke@435	118	static CodeBlob* alive(CodeBlob *cb);
duke@435	119	static nmethod* alive_nmethod(CodeBlob *cb);
never@1893	120	static nmethod* first_nmethod();
never@1893	121	static nmethod* next_nmethod (CodeBlob* cb);
duke@435	122	static int nof_blobs() { return _number_of_blobs; }
never@1999	123	static int nof_adapters() { return _number_of_adapters; }
never@1999	124	static int nof_nmethods() { return _number_of_nmethods; }
duke@435	125
duke@435	126	// GC support
duke@435	127	static void gc_epilogue();
duke@435	128	static void gc_prologue();
never@2657	129	static void verify_oops();
duke@435	130	// If "unloading_occurred" is true, then unloads (i.e., breaks root links
duke@435	131	// to) any unmarked codeBlobs in the cache. Sets "marked_for_unloading"
duke@435	132	// to "true" iff some code got unloaded.
brutisso@4098	133	static void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred);
jrose@1424	134	static void oops_do(OopClosure* f) {
jrose@1424	135	CodeBlobToOopClosure oopc(f, /*do_marking=*/ false);
jrose@1424	136	blobs_do(&oopc);
jrose@1424	137	}
jrose@1424	138	static void asserted_non_scavengable_nmethods_do(CodeBlobClosure* f = NULL) PRODUCT_RETURN;
jrose@1424	139	static void scavenge_root_nmethods_do(CodeBlobClosure* f);
jrose@1424	140
jrose@1424	141	static nmethod* scavenge_root_nmethods() { return _scavenge_root_nmethods; }
jrose@1424	142	static void set_scavenge_root_nmethods(nmethod* nm) { _scavenge_root_nmethods = nm; }
jrose@1424	143	static void add_scavenge_root_nmethod(nmethod* nm);
jrose@1424	144	static void drop_scavenge_root_nmethod(nmethod* nm);
jrose@1424	145	static void prune_scavenge_root_nmethods();
duke@435	146
duke@435	147	// Printing/debugging
vladidan@4438	148	static void print(); // prints summary
duke@435	149	static void print_internals();
duke@435	150	static void verify(); // verifies the code cache
jrose@1424	151	static void print_trace(const char* event, CodeBlob* cb, int size = 0) PRODUCT_RETURN;
vladidan@4438	152	static void print_summary(outputStream* st, bool detailed = true); // Prints a summary of the code cache usage
kvn@2635	153	static void log_state(outputStream* st);
duke@435	154
duke@435	155	// The full limits of the codeCache
duke@435	156	static address low_bound() { return (address) _heap->low_boundary(); }
duke@435	157	static address high_bound() { return (address) _heap->high_boundary(); }
duke@435	158
duke@435	159	// Profiling
duke@435	160	static address first_address(); // first address used for CodeBlobs
duke@435	161	static address last_address(); // last address used for CodeBlobs
duke@435	162	static size_t capacity() { return _heap->capacity(); }
duke@435	163	static size_t max_capacity() { return _heap->max_capacity(); }
duke@435	164	static size_t unallocated_capacity() { return _heap->unallocated_capacity(); }
neliasso@4952	165	static bool needs_flushing() { return unallocated_capacity() < CodeCacheFlushingMinimumFreeSpace; }
duke@435	166
duke@435	167	static bool needs_cache_clean() { return _needs_cache_clean; }
duke@435	168	static void set_needs_cache_clean(bool v) { _needs_cache_clean = v; }
duke@435	169	static void clear_inline_caches(); // clear all inline caches
duke@435	170
coleenp@4037	171	static nmethod* find_and_remove_saved_code(Method* m);
kvn@1637	172	static void remove_saved_code(nmethod* nm);
kvn@1637	173	static void speculatively_disconnect(nmethod* nm);
kvn@1637	174
duke@435	175	// Deoptimization
duke@435	176	static int mark_for_deoptimization(DepChange& changes);
duke@435	177	#ifdef HOTSWAP
duke@435	178	static int mark_for_evol_deoptimization(instanceKlassHandle dependee);
duke@435	179	#endif // HOTSWAP
duke@435	180
duke@435	181	static void mark_all_nmethods_for_deoptimization();
coleenp@4037	182	static int mark_for_deoptimization(Method* dependee);
duke@435	183	static void make_marked_nmethods_zombies();
duke@435	184	static void make_marked_nmethods_not_entrant();
duke@435	185
duke@435	186	// tells how many nmethods have dependencies
duke@435	187	static int number_of_nmethods_with_dependencies();
duke@435	188	};
stefank@2314	189
stefank@2314	190	#endif // SHARE_VM_CODE_CODECACHE_HPP