• file
• revisions
• annotate
• diff
• comparison
• raw

src/share/vm/runtime/perfMemory.cpp@9f4457a14b58 (annotated)

src/share/vm/runtime/perfMemory.cpp

Wed, 09 Apr 2008 15:10:22 -0700

author

rasbold

date

Wed, 09 Apr 2008 15:10:22 -0700

changeset 544

9f4457a14b58

parent 435

a61af66fc99e

child 869

de78b80cedec

permissions

-rw-r--r--

Merge

duke@435	1	/*
duke@435	2	* Copyright 2001-2006 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/_perfMemory.cpp.incl"
duke@435	27
duke@435	28	char* PerfMemory::_start = NULL;
duke@435	29	char* PerfMemory::_end = NULL;
duke@435	30	char* PerfMemory::_top = NULL;
duke@435	31	size_t PerfMemory::_capacity = 0;
duke@435	32	jint PerfMemory::_initialized = false;
duke@435	33	PerfDataPrologue* PerfMemory::_prologue = NULL;
duke@435	34
duke@435	35	void perfMemory_init() {
duke@435	36
duke@435	37	if (!UsePerfData) return;
duke@435	38
duke@435	39	PerfMemory::initialize();
duke@435	40	}
duke@435	41
duke@435	42	void perfMemory_exit() {
duke@435	43
duke@435	44	if (!UsePerfData) return;
duke@435	45	if (!PerfMemory::is_initialized()) return;
duke@435	46
duke@435	47	// if the StatSampler is active, then we don't want to remove
duke@435	48	// resources it may be dependent on. Typically, the StatSampler
duke@435	49	// is disengaged from the watcher thread when this method is called,
duke@435	50	// but it is not disengaged if this method is invoked during a
duke@435	51	// VM abort.
duke@435	52	//
duke@435	53	if (!StatSampler::is_active())
duke@435	54	PerfDataManager::destroy();
duke@435	55
duke@435	56	// remove the persistent external resources, if any. this method
duke@435	57	// does not unmap or invalidate any virtual memory allocated during
duke@435	58	// initialization.
duke@435	59	//
duke@435	60	PerfMemory::destroy();
duke@435	61	}
duke@435	62
duke@435	63	void PerfMemory::initialize() {
duke@435	64
duke@435	65	if (_prologue != NULL)
duke@435	66	// initialization already performed
duke@435	67	return;
duke@435	68
duke@435	69	size_t capacity = align_size_up(PerfDataMemorySize,
duke@435	70	os::vm_allocation_granularity());
duke@435	71
duke@435	72	if (PerfTraceMemOps) {
duke@435	73	tty->print("PerfDataMemorySize = " SIZE_FORMAT ","
duke@435	74	" os::vm_allocation_granularity = " SIZE_FORMAT ","
duke@435	75	" adjusted size = " SIZE_FORMAT "\n",
duke@435	76	PerfDataMemorySize,
duke@435	77	os::vm_allocation_granularity(),
duke@435	78	capacity);
duke@435	79	}
duke@435	80
duke@435	81	// allocate PerfData memory region
duke@435	82	create_memory_region(capacity);
duke@435	83
duke@435	84	if (_start == NULL) {
duke@435	85
duke@435	86	// the PerfMemory region could not be created as desired. Rather
duke@435	87	// than terminating the JVM, we revert to creating the instrumentation
duke@435	88	// on the C heap. When running in this mode, external monitoring
duke@435	89	// clients cannot attach to and monitor this JVM.
duke@435	90	//
duke@435	91	// the warning is issued only in debug mode in order to avoid
duke@435	92	// additional output to the stdout or stderr output streams.
duke@435	93	//
duke@435	94	if (PrintMiscellaneous && Verbose) {
duke@435	95	warning("Could not create PerfData Memory region, reverting to malloc");
duke@435	96	}
duke@435	97
duke@435	98	_prologue = NEW_C_HEAP_OBJ(PerfDataPrologue);
duke@435	99	}
duke@435	100	else {
duke@435	101
duke@435	102	// the PerfMemory region was created as expected.
duke@435	103
duke@435	104	if (PerfTraceMemOps) {
duke@435	105	tty->print("PerfMemory created: address = " INTPTR_FORMAT ","
duke@435	106	" size = " SIZE_FORMAT "\n",
duke@435	107	(void*)_start,
duke@435	108	_capacity);
duke@435	109	}
duke@435	110
duke@435	111	_prologue = (PerfDataPrologue *)_start;
duke@435	112	_end = _start + _capacity;
duke@435	113	_top = _start + sizeof(PerfDataPrologue);
duke@435	114	}
duke@435	115
duke@435	116	assert(_prologue != NULL, "prologue pointer must be initialized");
duke@435	117
duke@435	118	#ifdef VM_LITTLE_ENDIAN
duke@435	119	_prologue->magic = (jint)0xc0c0feca;
duke@435	120	_prologue->byte_order = PERFDATA_LITTLE_ENDIAN;
duke@435	121	#else
duke@435	122	_prologue->magic = (jint)0xcafec0c0;
duke@435	123	_prologue->byte_order = PERFDATA_BIG_ENDIAN;
duke@435	124	#endif
duke@435	125
duke@435	126	_prologue->major_version = PERFDATA_MAJOR_VERSION;
duke@435	127	_prologue->minor_version = PERFDATA_MINOR_VERSION;
duke@435	128	_prologue->accessible = 0;
duke@435	129
duke@435	130	_prologue->entry_offset = sizeof(PerfDataPrologue);
duke@435	131	_prologue->num_entries = 0;
duke@435	132	_prologue->used = 0;
duke@435	133	_prologue->overflow = 0;
duke@435	134	_prologue->mod_time_stamp = 0;
duke@435	135
duke@435	136	OrderAccess::release_store(&_initialized, 1);
duke@435	137	}
duke@435	138
duke@435	139	void PerfMemory::destroy() {
duke@435	140
duke@435	141	assert(_prologue != NULL, "prologue pointer must be initialized");
duke@435	142
duke@435	143	if (_start != NULL && _prologue->overflow != 0) {
duke@435	144
duke@435	145	// This state indicates that the contiguous memory region exists and
duke@435	146	// that it wasn't large enough to hold all the counters. In this case,
duke@435	147	// we output a warning message to the user on exit if the -XX:+Verbose
duke@435	148	// flag is set (a debug only flag). External monitoring tools can detect
duke@435	149	// this condition by monitoring the _prologue->overflow word.
duke@435	150	//
duke@435	151	// There are two tunables that can help resolve this issue:
duke@435	152	// - increase the size of the PerfMemory with -XX:PerfDataMemorySize=<n>
duke@435	153	// - decrease the maximum string constant length with
duke@435	154	// -XX:PerfMaxStringConstLength=<n>
duke@435	155	//
duke@435	156	if (PrintMiscellaneous && Verbose) {
duke@435	157	warning("PerfMemory Overflow Occurred.\n"
duke@435	158	"\tCapacity = " SIZE_FORMAT " bytes"
duke@435	159	" Used = " SIZE_FORMAT " bytes"
duke@435	160	" Overflow = " INT32_FORMAT " bytes"
duke@435	161	"\n\tUse -XX:PerfDataMemorySize=<size> to specify larger size.",
duke@435	162	PerfMemory::capacity(),
duke@435	163	PerfMemory::used(),
duke@435	164	_prologue->overflow);
duke@435	165	}
duke@435	166	}
duke@435	167
duke@435	168	if (_start != NULL) {
duke@435	169
duke@435	170	// this state indicates that the contiguous memory region was successfully
duke@435	171	// and that persistent resources may need to be cleaned up. This is
duke@435	172	// expected to be the typical condition.
duke@435	173	//
duke@435	174	delete_memory_region();
duke@435	175	}
duke@435	176
duke@435	177	_start = NULL;
duke@435	178	_end = NULL;
duke@435	179	_top = NULL;
duke@435	180	_prologue = NULL;
duke@435	181	_capacity = 0;
duke@435	182	}
duke@435	183
duke@435	184	// allocate an aligned block of memory from the PerfData memory
duke@435	185	// region. This method assumes that the PerfData memory region
duke@435	186	// was aligned on a double word boundary when created.
duke@435	187	//
duke@435	188	char* PerfMemory::alloc(size_t size) {
duke@435	189
duke@435	190	if (!UsePerfData) return NULL;
duke@435	191
duke@435	192	MutexLocker ml(PerfDataMemAlloc_lock);
duke@435	193
duke@435	194	assert(_prologue != NULL, "called before initialization");
duke@435	195
duke@435	196	// check that there is enough memory for this request
duke@435	197	if ((_top + size) >= _end) {
duke@435	198
duke@435	199	_prologue->overflow += (jint)size;
duke@435	200
duke@435	201	return NULL;
duke@435	202	}
duke@435	203
duke@435	204	char* result = _top;
duke@435	205
duke@435	206	_top += size;
duke@435	207
duke@435	208	assert(contains(result), "PerfData memory pointer out of range");
duke@435	209
duke@435	210	_prologue->used = (jint)used();
duke@435	211	_prologue->num_entries = _prologue->num_entries + 1;
duke@435	212
duke@435	213	return result;
duke@435	214	}
duke@435	215
duke@435	216	void PerfMemory::mark_updated() {
duke@435	217	if (!UsePerfData) return;
duke@435	218
duke@435	219	_prologue->mod_time_stamp = os::elapsed_counter();
duke@435	220	}
duke@435	221
duke@435	222	// Returns the complete path including the file name of performance data file.
duke@435	223	// Caller is expected to release the allocated memory.
duke@435	224	char* PerfMemory::get_perfdata_file_path() {
duke@435	225	char* dest_file = NULL;
duke@435	226
duke@435	227	if (PerfDataSaveFile != NULL) {
duke@435	228	// dest_file_name stores the validated file name if file_name
duke@435	229	// contains %p which will be replaced by pid.
duke@435	230	dest_file = NEW_C_HEAP_ARRAY(char, JVM_MAXPATHLEN);
duke@435	231	if(!Arguments::copy_expand_pid(PerfDataSaveFile, strlen(PerfDataSaveFile),
duke@435	232	dest_file, JVM_MAXPATHLEN)) {
duke@435	233	FREE_C_HEAP_ARRAY(char, dest_file);
duke@435	234	if (PrintMiscellaneous && Verbose) {
duke@435	235	warning("Invalid performance data file path name specified, "\
duke@435	236	"fall back to a default name");
duke@435	237	}
duke@435	238	} else {
duke@435	239	return dest_file;
duke@435	240	}
duke@435	241	}
duke@435	242	// create the name of the file for retaining the instrumentation memory.
duke@435	243	dest_file = NEW_C_HEAP_ARRAY(char, PERFDATA_FILENAME_LEN);
duke@435	244	jio_snprintf(dest_file, PERFDATA_FILENAME_LEN,
duke@435	245	"%s_%d", PERFDATA_NAME, os::current_process_id());
duke@435	246
duke@435	247	return dest_file;
duke@435	248	}