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/*
* Copyright (c) 2001, 2021, 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 "classfile/vmSymbols.hpp"
#include "jvm.h"
#include "logging/log.hpp"
#include "memory/allocation.inline.hpp"
#include "oops/oop.inline.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/java.hpp"
#include "runtime/mutex.hpp"
#include "runtime/mutexLocker.hpp"
#include "runtime/os.hpp"
#include "runtime/perfData.inline.hpp"
#include "utilities/exceptions.hpp"
#include "utilities/globalDefinitions.hpp"
PerfDataList* PerfDataManager::_all = NULL;
PerfDataList* PerfDataManager::_sampled = NULL;
PerfDataList* PerfDataManager::_constants = NULL;
volatile bool PerfDataManager::_has_PerfData = 0;
/*
* The jvmstat global and subsystem jvmstat counter name spaces. The top
* level name spaces imply the interface stability level of the counter,
* which generally follows the Java package, class, and property naming
* conventions. The CounterNS enumeration values should be used to index
* into this array.
*/
const char* PerfDataManager::_name_spaces[] = {
// top level name spaces
"java", // stable and supported name space
"com.sun", // unstable but supported name space
"sun", // unstable and unsupported name space
// subsystem name spaces
"java.gc", // Garbage Collection name spaces
"com.sun.gc",
"sun.gc",
"java.ci", // Compiler name spaces
"com.sun.ci",
"sun.ci",
"java.cls", // Class Loader name spaces
"com.sun.cls",
"sun.cls",
"java.rt", // Runtime name spaces
"com.sun.rt",
"sun.rt",
"java.os", // Operating System name spaces
"com.sun.os",
"sun.os",
"java.threads", // Threads System name spaces
"com.sun.threads",
"sun.threads",
"java.property", // Java Property name spaces
"com.sun.property",
"sun.property",
"",
};
PerfData::PerfData(CounterNS ns, const char* name, Units u, Variability v)
: _name(NULL), _v(v), _u(u), _on_c_heap(false), _valuep(NULL) {
const char* prefix = PerfDataManager::ns_to_string(ns);
_name = NEW_C_HEAP_ARRAY(char, strlen(name) + strlen(prefix) + 2, mtInternal);
assert(strlen(name) != 0, "invalid name");
if (ns == NULL_NS) {
// No prefix is added to counters with the NULL_NS namespace.
strcpy(_name, name);
// set the F_Supported flag based on the counter name prefix.
if (PerfDataManager::is_stable_supported(_name) ||
PerfDataManager::is_unstable_supported(_name)) {
_flags = F_Supported;
}
else {
_flags = F_None;
}
}
else {
sprintf(_name, "%s.%s", prefix, name);
// set the F_Supported flag based on the given namespace.
if (PerfDataManager::is_stable_supported(ns) ||
PerfDataManager::is_unstable_supported(ns)) {
_flags = F_Supported;
}
else {
_flags = F_None;
}
}
}
PerfData::~PerfData() {
FREE_C_HEAP_ARRAY(char, _name);
if (is_on_c_heap()) {
FREE_C_HEAP_ARRAY(PerfDataEntry, _pdep);
}
}
void PerfData::create_entry(BasicType dtype, size_t dsize, size_t vlen) {
size_t dlen = vlen==0 ? 1 : vlen;
size_t namelen = strlen(name()) + 1; // include null terminator
size_t size = sizeof(PerfDataEntry) + namelen;
size_t pad_length = ((size % dsize) == 0) ? 0 : dsize - (size % dsize);
size += pad_length;
size_t data_start = size;
size += (dsize * dlen);
// align size to assure allocation in units of 8 bytes
int align = sizeof(jlong) - 1;
size = ((size + align) & ~align);
char* psmp = PerfMemory::alloc(size);
if (psmp == NULL) {
// out of PerfMemory memory resources. allocate on the C heap
// to avoid vm termination.
psmp = NEW_C_HEAP_ARRAY(char, size, mtInternal);
_on_c_heap = true;
}
// compute the addresses for the name and data
char* cname = psmp + sizeof(PerfDataEntry);
// data is in the last dsize*dlen bytes of the entry
void* valuep = (void*) (psmp + data_start);
assert(is_on_c_heap() || PerfMemory::contains(cname), "just checking");
assert(is_on_c_heap() || PerfMemory::contains((char*)valuep), "just checking");
// copy the name, including null terminator, into PerfData memory
strcpy(cname, name());
// set the header values in PerfData memory
PerfDataEntry* pdep = (PerfDataEntry*)psmp;
pdep->entry_length = (jint)size;
pdep->name_offset = (jint) ((uintptr_t) cname - (uintptr_t) psmp);
pdep->vector_length = (jint)vlen;
pdep->data_type = (jbyte) type2char(dtype);
pdep->data_units = units();
pdep->data_variability = variability();
pdep->flags = (jbyte)flags();
pdep->data_offset = (jint) data_start;
log_debug(perf, datacreation)("name = %s, dtype = %d, variability = %d,"
" units = %d, dsize = " SIZE_FORMAT ", vlen = " SIZE_FORMAT ","
" pad_length = " SIZE_FORMAT ", size = " SIZE_FORMAT ", on_c_heap = %s,"
" address = " INTPTR_FORMAT ","
" data address = " INTPTR_FORMAT,
cname, dtype, variability(),
units(), dsize, vlen,
pad_length, size, is_on_c_heap() ? "TRUE":"FALSE",
p2i(psmp), p2i(valuep));
// record the start of the entry and the location of the data field.
_pdep = pdep;
_valuep = valuep;
// mark the PerfData memory region as having been updated.
PerfMemory::mark_updated();
}
PerfLong::PerfLong(CounterNS ns, const char* namep, Units u, Variability v)
: PerfData(ns, namep, u, v) {
create_entry(T_LONG, sizeof(jlong));
}
PerfLongVariant::PerfLongVariant(CounterNS ns, const char* namep, Units u,
Variability v, jlong* sampled)
: PerfLong(ns, namep, u, v),
_sampled(sampled), _sample_helper(NULL) {
sample();
}
PerfLongVariant::PerfLongVariant(CounterNS ns, const char* namep, Units u,
Variability v, PerfLongSampleHelper* helper)
: PerfLong(ns, namep, u, v),
_sampled(NULL), _sample_helper(helper) {
sample();
}
void PerfLongVariant::sample() {
if (_sample_helper != NULL) {
*(jlong*)_valuep = _sample_helper->take_sample();
}
}
PerfByteArray::PerfByteArray(CounterNS ns, const char* namep, Units u,
Variability v, jint length)
: PerfData(ns, namep, u, v), _length(length) {
create_entry(T_BYTE, sizeof(jbyte), (size_t)_length);
}
void PerfString::set_string(const char* s2) {
// copy n bytes of the string, assuring the null string is
// copied if s2 == NULL.
strncpy((char *)_valuep, s2 == NULL ? "" : s2, _length);
// assure the string is null terminated when strlen(s2) >= _length
((char*)_valuep)[_length-1] = '\0';
}
PerfStringConstant::PerfStringConstant(CounterNS ns, const char* namep,
const char* initial_value)
: PerfString(ns, namep, V_Constant,
initial_value == NULL ? 1 :
MIN2((jint)(strlen((char*)initial_value)+1),
(jint)(PerfMaxStringConstLength+1)),
initial_value) {
if (PrintMiscellaneous && Verbose) {
if (is_valid() && initial_value != NULL &&
((jint)strlen(initial_value) > (jint)PerfMaxStringConstLength)) {
warning("Truncating PerfStringConstant: name = %s,"
" length = " INT32_FORMAT ","
" PerfMaxStringConstLength = " INT32_FORMAT "\n",
namep,
(jint)strlen(initial_value),
(jint)PerfMaxStringConstLength);
}
}
}
void PerfDataManager::destroy() {
if (_all == NULL)
// destroy already called, or initialization never happened
return;
// Clear the flag before we free the PerfData counters. Thus begins
// the race between this thread and another thread that has just
// queried PerfDataManager::has_PerfData() and gotten back 'true'.
// The hope is that the other thread will finish its PerfData
// manipulation before we free the memory. The two alternatives are
// 1) leak the PerfData memory or 2) do some form of synchronized
// access or check before every PerfData operation.
_has_PerfData = false;
os::naked_short_sleep(1); // 1ms sleep to let other thread(s) run
log_debug(perf, datacreation)("Total = %d, Sampled = %d, Constants = %d",
_all->length(), _sampled == NULL ? 0 : _sampled->length(),
_constants == NULL ? 0 : _constants->length());
for (int index = 0; index < _all->length(); index++) {
PerfData* p = _all->at(index);
delete p;
}
delete(_all);
delete(_sampled);
delete(_constants);
_all = NULL;
_sampled = NULL;
_constants = NULL;
}
void PerfDataManager::add_item(PerfData* p, bool sampled) {
MutexLocker ml(PerfDataManager_lock);
// Default sizes determined using -Xlog:perf+datacreation=debug
if (_all == NULL) {
_all = new PerfDataList(191);
_has_PerfData = true;
}
assert(!_all->contains(p->name()), "duplicate name added");
// add to the list of all perf data items
_all->append(p);
if (p->variability() == PerfData::V_Constant) {
if (_constants == NULL) {
_constants = new PerfDataList(51);
}
_constants->append(p);
return;
}
if (sampled) {
if (_sampled == NULL) {
_sampled = new PerfDataList(1);
}
_sampled->append(p);
}
}
PerfDataList* PerfDataManager::sampled() {
MutexLocker ml(PerfDataManager_lock);
if (_sampled == NULL)
return NULL;
PerfDataList* clone = _sampled->clone();
return clone;
}
char* PerfDataManager::counter_name(const char* ns, const char* name) {
assert(ns != NULL, "ns string required");
assert(name != NULL, "name string required");
size_t len = strlen(ns) + strlen(name) + 2;
char* result = NEW_RESOURCE_ARRAY(char, len);
sprintf(result, "%s.%s", ns, name);
return result;
}
char* PerfDataManager::name_space(const char* ns, const char* sub,
int instance) {
char intbuf[40];
jio_snprintf(intbuf, 40, UINT32_FORMAT, instance);
return name_space(ns, name_space(sub, intbuf));
}
char *PerfDataManager::name_space(const char* ns, int instance) {
char intbuf[40];
jio_snprintf(intbuf, 40, UINT32_FORMAT, instance);
return name_space(ns, intbuf);
}
PerfStringConstant* PerfDataManager::create_string_constant(CounterNS ns,
const char* name,
const char* s,
TRAPS) {
PerfStringConstant* p = new PerfStringConstant(ns, name, s);
if (!p->is_valid()) {
// allocation of native resources failed.
delete p;
THROW_0(vmSymbols::java_lang_OutOfMemoryError());
}
add_item(p, false);
return p;
}
PerfLongConstant* PerfDataManager::create_long_constant(CounterNS ns,
const char* name,
PerfData::Units u,
jlong val, TRAPS) {
PerfLongConstant* p = new PerfLongConstant(ns, name, u, val);
if (!p->is_valid()) {
// allocation of native resources failed.
delete p;
THROW_0(vmSymbols::java_lang_OutOfMemoryError());
}
add_item(p, false);
return p;
}
PerfStringVariable* PerfDataManager::create_string_variable(CounterNS ns,
const char* name,
int max_length,
const char* s,
TRAPS) {
if (max_length == 0 && s != NULL) max_length = (int)strlen(s);
assert(max_length != 0, "PerfStringVariable with length 0");
PerfStringVariable* p = new PerfStringVariable(ns, name, max_length, s);
if (!p->is_valid()) {
// allocation of native resources failed.
delete p;
THROW_0(vmSymbols::java_lang_OutOfMemoryError());
}
add_item(p, false);
return p;
}
PerfLongVariable* PerfDataManager::create_long_variable(CounterNS ns,
const char* name,
PerfData::Units u,
jlong ival, TRAPS) {
PerfLongVariable* p = new PerfLongVariable(ns, name, u, ival);
if (!p->is_valid()) {
// allocation of native resources failed.
delete p;
THROW_0(vmSymbols::java_lang_OutOfMemoryError());
}
add_item(p, false);
return p;
}
PerfLongVariable* PerfDataManager::create_long_variable(CounterNS ns,
const char* name,
PerfData::Units u,
PerfSampleHelper* sh,
TRAPS) {
// Sampled counters not supported if UsePerfData is false
if (!UsePerfData) return NULL;
PerfLongVariable* p = new PerfLongVariable(ns, name, u, sh);
if (!p->is_valid()) {
// allocation of native resources failed.
delete p;
THROW_0(vmSymbols::java_lang_OutOfMemoryError());
}
add_item(p, true);
return p;
}
PerfLongCounter* PerfDataManager::create_long_counter(CounterNS ns,
const char* name,
PerfData::Units u,
jlong ival, TRAPS) {
PerfLongCounter* p = new PerfLongCounter(ns, name, u, ival);
if (!p->is_valid()) {
// allocation of native resources failed.
delete p;
THROW_0(vmSymbols::java_lang_OutOfMemoryError());
}
add_item(p, false);
return p;
}
PerfLongCounter* PerfDataManager::create_long_counter(CounterNS ns,
const char* name,
PerfData::Units u,
PerfSampleHelper* sh,
TRAPS) {
// Sampled counters not supported if UsePerfData is false
if (!UsePerfData) return NULL;
PerfLongCounter* p = new PerfLongCounter(ns, name, u, sh);
if (!p->is_valid()) {
// allocation of native resources failed.
delete p;
THROW_0(vmSymbols::java_lang_OutOfMemoryError());
}
add_item(p, true);
return p;
}
PerfDataList::PerfDataList(int length) {
_set = new (mtInternal) PerfDataArray(length, mtInternal);
}
PerfDataList::PerfDataList(PerfDataList* p) {
_set = new (mtInternal) PerfDataArray(p->length(), mtInternal);
_set->appendAll(p->get_impl());
}
PerfDataList::~PerfDataList() {
delete _set;
}
bool PerfDataList::by_name(void* name, PerfData* pd) {
if (pd == NULL)
return false;
return strcmp((const char*)name, pd->name()) == 0;
}
PerfData* PerfDataList::find_by_name(const char* name) {
int i = _set->find((void*)name, PerfDataList::by_name);
if (i >= 0 && i <= _set->length())
return _set->at(i);
else
return NULL;
}
PerfDataList* PerfDataList::clone() {
PerfDataList* copy = new PerfDataList(this);
assert(copy != NULL, "just checking");
return copy;
}
PerfTraceTime::~PerfTraceTime() {
if (!UsePerfData) return;
_t.stop();
_timerp->inc(_t.ticks());
}
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