vm/runtime/perfMemory.cpp

	perfMemory.cpp revision 1472
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov/*
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov * Copyright (c) 2001, 2008, Oracle and/or its affiliates. All rights reserved.
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov *
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov * This code is free software; you can redistribute it and/or modify it
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov * under the terms of the GNU General Public License version 2 only, as
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov * published by the Free Software Foundation.
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov *
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov * This code is distributed in the hope that it will be useful, but WITHOUT
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov * version 2 for more details (a copy is included in the LICENSE file that
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov * accompanied this code).
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov *
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov * You should have received a copy of the GNU General Public License version
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov * 2 along with this work; if not, write to the Free Software Foundation,
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov *
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov * or visit www.oracle.com if you need additional information or have any
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov * questions.
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov *
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov */
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov# include "incls/_precompiled.incl"
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov# include "incls/_perfMemory.cpp.incl"
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov// Prefix of performance data file.
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirovconst char               PERFDATA_NAME[] = "hsperfdata";
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov// Add 1 for the '_' character between PERFDATA_NAME and pid. The '\0' terminating
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov// character will be included in the sizeof(PERFDATA_NAME) operation.
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirovstatic const size_t PERFDATA_FILENAME_LEN = sizeof(PERFDATA_NAME) +
148315348760faf4ad822ded7c416d2de8050937Alexander Vladimirov                                            UINT_CHARS + 1;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirovchar*                    PerfMemory::_start = NULL;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirovchar*                    PerfMemory::_end = NULL;
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirovchar*                    PerfMemory::_top = NULL;
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirovsize_t                   PerfMemory::_capacity = 0;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirovjint                     PerfMemory::_initialized = false;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander VladimirovPerfDataPrologue*        PerfMemory::_prologue = NULL;
4852d800d11740225072579e8bd8c4b56df581eeAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirovvoid perfMemory_init() {
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  if (!UsePerfData) return;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  PerfMemory::initialize();
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov}
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirovvoid perfMemory_exit() {
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  if (!UsePerfData) return;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  if (!PerfMemory::is_initialized()) return;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  // if the StatSampler is active, then we don't want to remove
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  // resources it may be dependent on. Typically, the StatSampler
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  // is disengaged from the watcher thread when this method is called,
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  // but it is not disengaged if this method is invoked during a
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  // VM abort.
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  //
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  if (!StatSampler::is_active())
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    PerfDataManager::destroy();
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  // remove the persistent external resources, if any. this method
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  // does not unmap or invalidate any virtual memory allocated during
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  // initialization.
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  //
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  PerfMemory::destroy();
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov}
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirovvoid PerfMemory::initialize() {
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  if (_prologue != NULL)
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    // initialization already performed
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    return;
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  size_t capacity = align_size_up(PerfDataMemorySize,
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov                                  os::vm_allocation_granularity());
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  if (PerfTraceMemOps) {
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    tty->print("PerfDataMemorySize = " SIZE_FORMAT ","
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov               " os::vm_allocation_granularity = " SIZE_FORMAT ","
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov               " adjusted size = " SIZE_FORMAT "\n",
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov               PerfDataMemorySize,
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov               os::vm_allocation_granularity(),
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov               capacity);
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  }
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  // allocate PerfData memory region
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  create_memory_region(capacity);
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  if (_start == NULL) {
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov    // the PerfMemory region could not be created as desired. Rather
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov    // than terminating the JVM, we revert to creating the instrumentation
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    // on the C heap. When running in this mode, external monitoring
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    // clients cannot attach to and monitor this JVM.
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov    //
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    // the warning is issued only in debug mode in order to avoid
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    // additional output to the stdout or stderr output streams.
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    //
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    if (PrintMiscellaneous && Verbose) {
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov      warning("Could not create PerfData Memory region, reverting to malloc");
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    }
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov    _prologue = NEW_C_HEAP_OBJ(PerfDataPrologue);
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  }
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  else {
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov    // the PerfMemory region was created as expected.
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov    if (PerfTraceMemOps) {
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov      tty->print("PerfMemory created: address = " INTPTR_FORMAT ","
148315348760faf4ad822ded7c416d2de8050937Alexander Vladimirov                 " size = " SIZE_FORMAT "\n",
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov                 (void*)_start,
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov                 _capacity);
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    }
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    _prologue = (PerfDataPrologue *)_start;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    _end = _start + _capacity;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    _top = _start + sizeof(PerfDataPrologue);
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  }
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  assert(_prologue != NULL, "prologue pointer must be initialized");
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov#ifdef VM_LITTLE_ENDIAN
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  _prologue->magic = (jint)0xc0c0feca;
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  _prologue->byte_order = PERFDATA_LITTLE_ENDIAN;
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov#else
6139e7e52d914af89f2a204512c1345af56ce6e9Alexander Vladimirov  _prologue->magic = (jint)0xcafec0c0;
6139e7e52d914af89f2a204512c1345af56ce6e9Alexander Vladimirov  _prologue->byte_order = PERFDATA_BIG_ENDIAN;
6139e7e52d914af89f2a204512c1345af56ce6e9Alexander Vladimirov#endif
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  _prologue->major_version = PERFDATA_MAJOR_VERSION;
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  _prologue->minor_version = PERFDATA_MINOR_VERSION;
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  _prologue->accessible = 0;
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  _prologue->entry_offset = sizeof(PerfDataPrologue);
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  _prologue->num_entries = 0;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  _prologue->used = 0;
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  _prologue->overflow = 0;
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  _prologue->mod_time_stamp = 0;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  OrderAccess::release_store(&_initialized, 1);
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov}
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirovvoid PerfMemory::destroy() {
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  assert(_prologue != NULL, "prologue pointer must be initialized");
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  if (_start != NULL && _prologue->overflow != 0) {
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov    // This state indicates that the contiguous memory region exists and
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    // that it wasn't large enough to hold all the counters. In this case,
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    // we output a warning message to the user on exit if the -XX:+Verbose
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    // flag is set (a debug only flag). External monitoring tools can detect
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov    // this condition by monitoring the _prologue->overflow word.
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov    //
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov    // There are two tunables that can help resolve this issue:
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov    //   - increase the size of the PerfMemory with -XX:PerfDataMemorySize=<n>
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    //   - decrease the maximum string constant length with
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    //     -XX:PerfMaxStringConstLength=<n>
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    //
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    if (PrintMiscellaneous && Verbose) {
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov      warning("PerfMemory Overflow Occurred.\n"
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov              "\tCapacity = " SIZE_FORMAT " bytes"
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov              "  Used = " SIZE_FORMAT " bytes"
148315348760faf4ad822ded7c416d2de8050937Alexander Vladimirov              "  Overflow = " INT32_FORMAT " bytes"
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov              "\n\tUse -XX:PerfDataMemorySize=<size> to specify larger size.",
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov              PerfMemory::capacity(),
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov              PerfMemory::used(),
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov              _prologue->overflow);
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    }
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  }
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  if (_start != NULL) {
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    // this state indicates that the contiguous memory region was successfully
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    // and that persistent resources may need to be cleaned up. This is
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov    // expected to be the typical condition.
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    //
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    delete_memory_region();
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  }
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  _start = NULL;
148315348760faf4ad822ded7c416d2de8050937Alexander Vladimirov  _end = NULL;
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  _top = NULL;
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  _prologue = NULL;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  _capacity = 0;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov}
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov// allocate an aligned block of memory from the PerfData memory
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov// region. This method assumes that the PerfData memory region
148315348760faf4ad822ded7c416d2de8050937Alexander Vladimirov// was aligned on a double word boundary when created.
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov//
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirovchar* PerfMemory::alloc(size_t size) {
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  if (!UsePerfData) return NULL;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  MutexLocker ml(PerfDataMemAlloc_lock);
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  assert(_prologue != NULL, "called before initialization");
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  // check that there is enough memory for this request
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  if ((_top + size) >= _end) {
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov    _prologue->overflow += (jint)size;
148315348760faf4ad822ded7c416d2de8050937Alexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov    return NULL;
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  }
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  char* result = _top;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  _top += size;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  assert(contains(result), "PerfData memory pointer out of range");
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  _prologue->used = (jint)used();
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  _prologue->num_entries = _prologue->num_entries + 1;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  return result;
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov}
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirovvoid PerfMemory::mark_updated() {
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov  if (!UsePerfData) return;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  _prologue->mod_time_stamp = os::elapsed_counter();
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov}
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov// Returns the complete path including the file name of performance data file.
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov// Caller is expected to release the allocated memory.
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirovchar* PerfMemory::get_perfdata_file_path() {
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  char* dest_file = NULL;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  if (PerfDataSaveFile != NULL) {
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    // dest_file_name stores the validated file name if file_name
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    // contains %p which will be replaced by pid.
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    dest_file = NEW_C_HEAP_ARRAY(char, JVM_MAXPATHLEN);
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    if(!Arguments::copy_expand_pid(PerfDataSaveFile, strlen(PerfDataSaveFile),
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov                                   dest_file, JVM_MAXPATHLEN)) {
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov      FREE_C_HEAP_ARRAY(char, dest_file);
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov      if (PrintMiscellaneous && Verbose) {
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov        warning("Invalid performance data file path name specified, "\
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov                "fall back to a default name");
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov      }
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    } else {
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov      return dest_file;
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov    }
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  }
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  // create the name of the file for retaining the instrumentation memory.
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  dest_file = NEW_C_HEAP_ARRAY(char, PERFDATA_FILENAME_LEN);
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  jio_snprintf(dest_file, PERFDATA_FILENAME_LEN,
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov               "%s_%d", PERFDATA_NAME, os::current_process_id());
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov  return dest_file;
f3849d01d8f31785bf933ffcf91a419c4ff2257dAlexander Vladimirov}
f6267d9011eea5074028dc44b49df3bd3df7443cAlexander Vladimirov