jdk8-mips64-public/hotspot: src/share/vm/runtime/perfMemory.cpp@7ae4e26cb1e0 (annotated)

src/share/vm/runtime/perfMemory.cpp@7ae4e26cb1e0 (annotated)

src/share/vm/runtime/perfMemory.cpp

Thu, 12 Oct 2017 21:27:07 +0800

author: aoqi
date: Thu, 12 Oct 2017 21:27:07 +0800
changeset 7535: 7ae4e26cb1e0
parent 6911: ce8f6bb717c9
parent 6876: 710a3c8b516e
permissions: -rw-r--r--

merge

 /*
  * Copyright (c) 2001, 2014, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "memory/allocation.inline.hpp"
 #include "runtime/arguments.hpp"
 #include "runtime/java.hpp"
 #include "runtime/mutex.hpp"
 #include "runtime/mutexLocker.hpp"
 #include "runtime/orderAccess.inline.hpp"
 #include "runtime/os.hpp"
 #include "runtime/perfData.hpp"
 #include "runtime/perfMemory.hpp"
 #include "runtime/statSampler.hpp"
 #include "utilities/globalDefinitions.hpp"
 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
 // Prefix of performance data file.
 const char               PERFDATA_NAME[] = "hsperfdata";
 // Add 1 for the '_' character between PERFDATA_NAME and pid. The '\0' terminating
 // character will be included in the sizeof(PERFDATA_NAME) operation.
 static const size_t PERFDATA_FILENAME_LEN = sizeof(PERFDATA_NAME) +
                                             UINT_CHARS + 1;
 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, mtInternal);
   }
   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() {
   if (_prologue == NULL) return;
   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, mtInternal);
     if(!Arguments::copy_expand_pid(PerfDataSaveFile, strlen(PerfDataSaveFile),
                                    dest_file, JVM_MAXPATHLEN)) {
       FREE_C_HEAP_ARRAY(char, dest_file, mtInternal);
       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, mtInternal);
   jio_snprintf(dest_file, PERFDATA_FILENAME_LEN,
                "%s_%d", PERFDATA_NAME, os::current_process_id());
   return dest_file;
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/perfMemory.cpp@7ae4e26cb1e0 (annotated)

src/share/vm/runtime/perfMemory.cpp