266 lines
8.5 KiB
C++
266 lines
8.5 KiB
C++
/*
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* Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "memory/allocation.inline.hpp"
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#include "runtime/arguments.hpp"
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#include "runtime/java.hpp"
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#include "runtime/mutex.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/os.hpp"
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#include "runtime/perfData.hpp"
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#include "runtime/perfMemory.hpp"
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#include "runtime/statSampler.hpp"
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#include "utilities/globalDefinitions.hpp"
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// Prefix of performance data file.
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const char PERFDATA_NAME[] = "hsperfdata";
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// Add 1 for the '_' character between PERFDATA_NAME and pid. The '\0' terminating
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// character will be included in the sizeof(PERFDATA_NAME) operation.
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static const size_t PERFDATA_FILENAME_LEN = sizeof(PERFDATA_NAME) +
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UINT_CHARS + 1;
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char* PerfMemory::_start = NULL;
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char* PerfMemory::_end = NULL;
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char* PerfMemory::_top = NULL;
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size_t PerfMemory::_capacity = 0;
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jint PerfMemory::_initialized = false;
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PerfDataPrologue* PerfMemory::_prologue = NULL;
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void perfMemory_init() {
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if (!UsePerfData) return;
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PerfMemory::initialize();
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}
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void perfMemory_exit() {
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if (!UsePerfData) return;
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if (!PerfMemory::is_initialized()) return;
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// if the StatSampler is active, then we don't want to remove
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// resources it may be dependent on. Typically, the StatSampler
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// is disengaged from the watcher thread when this method is called,
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// but it is not disengaged if this method is invoked during a
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// VM abort.
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//
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if (!StatSampler::is_active())
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PerfDataManager::destroy();
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// remove the persistent external resources, if any. this method
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// does not unmap or invalidate any virtual memory allocated during
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// initialization.
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//
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PerfMemory::destroy();
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}
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void PerfMemory::initialize() {
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if (_prologue != NULL)
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// initialization already performed
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return;
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size_t capacity = align_size_up(PerfDataMemorySize,
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os::vm_allocation_granularity());
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if (PerfTraceMemOps) {
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tty->print("PerfDataMemorySize = " SIZE_FORMAT ","
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" os::vm_allocation_granularity = " SIZE_FORMAT ","
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" adjusted size = " SIZE_FORMAT "\n",
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PerfDataMemorySize,
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os::vm_allocation_granularity(),
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capacity);
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}
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// allocate PerfData memory region
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create_memory_region(capacity);
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if (_start == NULL) {
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// the PerfMemory region could not be created as desired. Rather
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// than terminating the JVM, we revert to creating the instrumentation
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// on the C heap. When running in this mode, external monitoring
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// clients cannot attach to and monitor this JVM.
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//
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// the warning is issued only in debug mode in order to avoid
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// additional output to the stdout or stderr output streams.
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//
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if (PrintMiscellaneous && Verbose) {
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warning("Could not create PerfData Memory region, reverting to malloc");
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}
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_prologue = NEW_C_HEAP_OBJ(PerfDataPrologue, mtInternal);
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}
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else {
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// the PerfMemory region was created as expected.
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if (PerfTraceMemOps) {
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tty->print("PerfMemory created: address = " INTPTR_FORMAT ","
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" size = " SIZE_FORMAT "\n",
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(void*)_start,
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_capacity);
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}
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_prologue = (PerfDataPrologue *)_start;
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_end = _start + _capacity;
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_top = _start + sizeof(PerfDataPrologue);
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}
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assert(_prologue != NULL, "prologue pointer must be initialized");
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#ifdef VM_LITTLE_ENDIAN
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_prologue->magic = (jint)0xc0c0feca;
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_prologue->byte_order = PERFDATA_LITTLE_ENDIAN;
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#else
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_prologue->magic = (jint)0xcafec0c0;
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_prologue->byte_order = PERFDATA_BIG_ENDIAN;
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#endif
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_prologue->major_version = PERFDATA_MAJOR_VERSION;
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_prologue->minor_version = PERFDATA_MINOR_VERSION;
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_prologue->accessible = 0;
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_prologue->entry_offset = sizeof(PerfDataPrologue);
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_prologue->num_entries = 0;
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_prologue->used = 0;
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_prologue->overflow = 0;
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_prologue->mod_time_stamp = 0;
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OrderAccess::release_store(&_initialized, 1);
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}
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void PerfMemory::destroy() {
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assert(_prologue != NULL, "prologue pointer must be initialized");
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if (_start != NULL && _prologue->overflow != 0) {
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// This state indicates that the contiguous memory region exists and
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// that it wasn't large enough to hold all the counters. In this case,
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// we output a warning message to the user on exit if the -XX:+Verbose
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// flag is set (a debug only flag). External monitoring tools can detect
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// this condition by monitoring the _prologue->overflow word.
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//
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// There are two tunables that can help resolve this issue:
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// - increase the size of the PerfMemory with -XX:PerfDataMemorySize=<n>
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// - decrease the maximum string constant length with
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// -XX:PerfMaxStringConstLength=<n>
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//
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if (PrintMiscellaneous && Verbose) {
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warning("PerfMemory Overflow Occurred.\n"
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"\tCapacity = " SIZE_FORMAT " bytes"
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" Used = " SIZE_FORMAT " bytes"
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" Overflow = " INT32_FORMAT " bytes"
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"\n\tUse -XX:PerfDataMemorySize=<size> to specify larger size.",
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PerfMemory::capacity(),
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PerfMemory::used(),
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_prologue->overflow);
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}
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}
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if (_start != NULL) {
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// this state indicates that the contiguous memory region was successfully
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// and that persistent resources may need to be cleaned up. This is
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// expected to be the typical condition.
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//
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delete_memory_region();
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}
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_start = NULL;
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_end = NULL;
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_top = NULL;
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_prologue = NULL;
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_capacity = 0;
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}
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// allocate an aligned block of memory from the PerfData memory
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// region. This method assumes that the PerfData memory region
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// was aligned on a double word boundary when created.
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//
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char* PerfMemory::alloc(size_t size) {
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if (!UsePerfData) return NULL;
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MutexLocker ml(PerfDataMemAlloc_lock);
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assert(_prologue != NULL, "called before initialization");
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// check that there is enough memory for this request
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if ((_top + size) >= _end) {
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_prologue->overflow += (jint)size;
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return NULL;
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}
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char* result = _top;
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_top += size;
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assert(contains(result), "PerfData memory pointer out of range");
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_prologue->used = (jint)used();
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_prologue->num_entries = _prologue->num_entries + 1;
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return result;
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}
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void PerfMemory::mark_updated() {
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if (!UsePerfData) return;
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_prologue->mod_time_stamp = os::elapsed_counter();
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}
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// Returns the complete path including the file name of performance data file.
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// Caller is expected to release the allocated memory.
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char* PerfMemory::get_perfdata_file_path() {
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char* dest_file = NULL;
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if (PerfDataSaveFile != NULL) {
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// dest_file_name stores the validated file name if file_name
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// contains %p which will be replaced by pid.
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dest_file = NEW_C_HEAP_ARRAY(char, JVM_MAXPATHLEN, mtInternal);
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if(!Arguments::copy_expand_pid(PerfDataSaveFile, strlen(PerfDataSaveFile),
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dest_file, JVM_MAXPATHLEN)) {
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FREE_C_HEAP_ARRAY(char, dest_file, mtInternal);
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if (PrintMiscellaneous && Verbose) {
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warning("Invalid performance data file path name specified, "\
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"fall back to a default name");
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}
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} else {
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return dest_file;
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}
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}
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// create the name of the file for retaining the instrumentation memory.
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dest_file = NEW_C_HEAP_ARRAY(char, PERFDATA_FILENAME_LEN, mtInternal);
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jio_snprintf(dest_file, PERFDATA_FILENAME_LEN,
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"%s_%d", PERFDATA_NAME, os::current_process_id());
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return dest_file;
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}
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