truffle: src/share/vm/runtime/perfMemory.cpp comparison

comparison src/share/vm/runtime/perfMemory.cpp @ 0:a61af66fc99e jdk7-b24

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author	duke
date	Sat, 01 Dec 2007 00:00:00 +0000
parents
children	de78b80cedec

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--1:000000000000
+:a61af66fc99e
+/*
+* Copyright 2001-2006 Sun Microsystems, Inc.  All Rights Reserved.
+* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+*
+* This code is free software; you can redistribute it and/or modify it
+* under the terms of the GNU General Public License version 2 only, as
+* published by the Free Software Foundation.
+*
+* This code is distributed in the hope that it will be useful, but WITHOUT
+* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+* version 2 for more details (a copy is included in the LICENSE file that
+* accompanied this code).
+*
+* You should have received a copy of the GNU General Public License version
+* 2 along with this work; if not, write to the Free Software Foundation,
+* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+*
+* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+* CA 95054 USA or visit www.sun.com if you need additional information or
+* have any questions.
+*
+*/
+# include "incls/_precompiled.incl"
+# include "incls/_perfMemory.cpp.incl"
+char*                    PerfMemory::_start = NULL;
+char*                    PerfMemory::_end = NULL;
+char*                    PerfMemory::_top = NULL;
+size_t                   PerfMemory::_capacity = 0;
+jint                     PerfMemory::_initialized = false;
+PerfDataPrologue*        PerfMemory::_prologue = NULL;
+void perfMemory_init() {
+if (!UsePerfData) return;
+PerfMemory::initialize();
+}
+void perfMemory_exit() {
+if (!UsePerfData) return;
+if (!PerfMemory::is_initialized()) return;
+// if the StatSampler is active, then we don't want to remove
+// resources it may be dependent on. Typically, the StatSampler
+// is disengaged from the watcher thread when this method is called,
+// but it is not disengaged if this method is invoked during a
+// VM abort.
+//
+if (!StatSampler::is_active())
+PerfDataManager::destroy();
+// remove the persistent external resources, if any. this method
+// does not unmap or invalidate any virtual memory allocated during
+// initialization.
+//
+PerfMemory::destroy();
+}
+void PerfMemory::initialize() {
+if (_prologue != NULL)
+// initialization already performed
+return;
+size_t capacity = align_size_up(PerfDataMemorySize,
+os::vm_allocation_granularity());
+if (PerfTraceMemOps) {
+tty->print("PerfDataMemorySize = " SIZE_FORMAT ","
+" os::vm_allocation_granularity = " SIZE_FORMAT ","
+" adjusted size = " SIZE_FORMAT "\n",
+PerfDataMemorySize,
+os::vm_allocation_granularity(),
+capacity);
+}
+// allocate PerfData memory region
+create_memory_region(capacity);
+if (_start == NULL) {
+// the PerfMemory region could not be created as desired. Rather
+// than terminating the JVM, we revert to creating the instrumentation
+// on the C heap. When running in this mode, external monitoring
+// clients cannot attach to and monitor this JVM.
+//
+// the warning is issued only in debug mode in order to avoid
+// additional output to the stdout or stderr output streams.
+//
+if (PrintMiscellaneous && Verbose) {
+warning("Could not create PerfData Memory region, reverting to malloc");
+}
+_prologue = NEW_C_HEAP_OBJ(PerfDataPrologue);
+}
+else {
+// the PerfMemory region was created as expected.
+if (PerfTraceMemOps) {
+tty->print("PerfMemory created: address = " INTPTR_FORMAT ","
+" size = " SIZE_FORMAT "\n",
+(void*)_start,
+_capacity);
+}
+_prologue = (PerfDataPrologue *)_start;
+_end = _start + _capacity;
+_top = _start + sizeof(PerfDataPrologue);
+}
+assert(_prologue != NULL, "prologue pointer must be initialized");
+#ifdef VM_LITTLE_ENDIAN
+_prologue->magic = (jint)0xc0c0feca;
+_prologue->byte_order = PERFDATA_LITTLE_ENDIAN;
+#else
+_prologue->magic = (jint)0xcafec0c0;
+_prologue->byte_order = PERFDATA_BIG_ENDIAN;
+#endif
+_prologue->major_version = PERFDATA_MAJOR_VERSION;
+_prologue->minor_version = PERFDATA_MINOR_VERSION;
+_prologue->accessible = 0;
+_prologue->entry_offset = sizeof(PerfDataPrologue);
+_prologue->num_entries = 0;
+_prologue->used = 0;
+_prologue->overflow = 0;
+_prologue->mod_time_stamp = 0;
+OrderAccess::release_store(&_initialized, 1);
+}
+void PerfMemory::destroy() {
+assert(_prologue != NULL, "prologue pointer must be initialized");
+if (_start != NULL && _prologue->overflow != 0) {
+// This state indicates that the contiguous memory region exists and
+// that it wasn't large enough to hold all the counters. In this case,
+// we output a warning message to the user on exit if the -XX:+Verbose
+// flag is set (a debug only flag). External monitoring tools can detect
+// this condition by monitoring the _prologue->overflow word.
+//
+// There are two tunables that can help resolve this issue:
+//   - increase the size of the PerfMemory with -XX:PerfDataMemorySize=<n>
+//   - decrease the maximum string constant length with
+//     -XX:PerfMaxStringConstLength=<n>
+//
+if (PrintMiscellaneous && Verbose) {
+warning("PerfMemory Overflow Occurred.\n"
+"\tCapacity = " SIZE_FORMAT " bytes"
+"  Used = " SIZE_FORMAT " bytes"
+"  Overflow = " INT32_FORMAT " bytes"
+"\n\tUse -XX:PerfDataMemorySize=<size> to specify larger size.",
+PerfMemory::capacity(),
+PerfMemory::used(),
+_prologue->overflow);
+}
+}
+if (_start != NULL) {
+// this state indicates that the contiguous memory region was successfully
+// and that persistent resources may need to be cleaned up. This is
+// expected to be the typical condition.
+//
+delete_memory_region();
+}
+_start = NULL;
+_end = NULL;
+_top = NULL;
+_prologue = NULL;
+_capacity = 0;
+}
+// allocate an aligned block of memory from the PerfData memory
+// region. This method assumes that the PerfData memory region
+// was aligned on a double word boundary when created.
+//
+char* PerfMemory::alloc(size_t size) {
+if (!UsePerfData) return NULL;
+MutexLocker ml(PerfDataMemAlloc_lock);
+assert(_prologue != NULL, "called before initialization");
+// check that there is enough memory for this request
+if ((_top + size) >= _end) {
+_prologue->overflow += (jint)size;
+return NULL;
+}
+char* result = _top;
+_top += size;
+assert(contains(result), "PerfData memory pointer out of range");
+_prologue->used = (jint)used();
+_prologue->num_entries = _prologue->num_entries + 1;
+return result;
+}
+void PerfMemory::mark_updated() {
+if (!UsePerfData) return;
+_prologue->mod_time_stamp = os::elapsed_counter();
+}
+// Returns the complete path including the file name of performance data file.
+// Caller is expected to release the allocated memory.
+char* PerfMemory::get_perfdata_file_path() {
+char* dest_file = NULL;
+if (PerfDataSaveFile != NULL) {
+// dest_file_name stores the validated file name if file_name
+// contains %p which will be replaced by pid.
+dest_file = NEW_C_HEAP_ARRAY(char, JVM_MAXPATHLEN);
+if(!Arguments::copy_expand_pid(PerfDataSaveFile, strlen(PerfDataSaveFile),
+dest_file, JVM_MAXPATHLEN)) {
+FREE_C_HEAP_ARRAY(char, dest_file);
+if (PrintMiscellaneous && Verbose) {
+warning("Invalid performance data file path name specified, "\
+"fall back to a default name");
+}
+} else {
+return dest_file;
+}
+}
+// create the name of the file for retaining the instrumentation memory.
+dest_file = NEW_C_HEAP_ARRAY(char, PERFDATA_FILENAME_LEN);
+jio_snprintf(dest_file, PERFDATA_FILENAME_LEN,
+"%s_%d", PERFDATA_NAME, os::current_process_id());
+return dest_file;
+}

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comparison src/share/vm/runtime/perfMemory.cpp @ 0:a61af66fc99e jdk7-b24