/** {@inheritDoc} */
protected void getNewMonitors(Map<String, Monitor> map) throws MonitorException {
assert Thread.holdsLock(this);
int used = prologue.getUsed();
long modificationTime = prologue.getModificationTimeStamp();
if ((used > lastUsed) || (lastModificationTime > modificationTime)) {
lastUsed = used;
lastModificationTime = modificationTime;
Monitor monitor = getNextMonitorEntry();
while (monitor != null) {
String name = monitor.getName();
// guard against duplicate entries
if (!map.containsKey(name)) {
map.put(name, monitor);
/*
* insertedMonitors is null when called from pollFor()
* via buildMonitorMap(). Since we update insertedMonitors
* at the end of buildMonitorMap(), it's ok to skip the
* add here.
*/
if (insertedMonitors != null) {
insertedMonitors.add(monitor);
}
}
monitor = getNextMonitorEntry();
}
}
}
/** {@inheritDoc} */
protected void buildMonitorMap(Map<String, Monitor> map) throws MonitorException {
assert Thread.holdsLock(this);
// start at the beginning of the buffer
buffer.rewind();
// create pseudo monitors
buildPseudoMonitors(map);
// position buffer to start of the data section
buffer.position(prologue.getSize());
nextEntry = buffer.position();
perfDataItem = 0;
int used = prologue.getUsed();
long modificationTime = prologue.getModificationTimeStamp();
Monitor m = getNextMonitorEntry();
while (m != null) {
map.put(m.getName(), m);
m = getNextMonitorEntry();
}
/*
* set the last modification data. These are set to the values
* recorded before parsing the data structure. This allows the
* the data structure to be modified while the Map is being built.
* The Map may contain more entries than indicated based on the
* time stamp, but this is handled by ignoring duplicate entries
* when the Map is updated in getNewMonitors().
*/
lastUsed = used;
lastModificationTime = modificationTime;
// synchronize with the target jvm
synchWithTarget(map);
// work around 1.4.2 counter inititization bugs
kludge(map);
insertedMonitors = new ArrayList<Monitor>(map.values());
}
/** Build the pseudo monitors used to map the prolog data into counters. */
protected void buildPseudoMonitors(Map<String, Monitor> map) {
Monitor monitor = null;
String name = null;
IntBuffer ib = null;
name = PerfDataBufferPrologue.PERFDATA_MAJOR_NAME;
ib = prologue.majorVersionBuffer();
monitor = new PerfIntegerMonitor(name, Units.NONE, Variability.CONSTANT, false, ib);
map.put(name, monitor);
name = PerfDataBufferPrologue.PERFDATA_MINOR_NAME;
ib = prologue.minorVersionBuffer();
monitor = new PerfIntegerMonitor(name, Units.NONE, Variability.CONSTANT, false, ib);
map.put(name, monitor);
name = PerfDataBufferPrologue.PERFDATA_BUFFER_SIZE_NAME;
ib = prologue.sizeBuffer();
monitor = new PerfIntegerMonitor(name, Units.BYTES, Variability.MONOTONIC, false, ib);
map.put(name, monitor);
name = PerfDataBufferPrologue.PERFDATA_BUFFER_USED_NAME;
ib = prologue.usedBuffer();
monitor = new PerfIntegerMonitor(name, Units.BYTES, Variability.MONOTONIC, false, ib);
map.put(name, monitor);
name = PerfDataBufferPrologue.PERFDATA_OVERFLOW_NAME;
ib = prologue.overflowBuffer();
monitor = new PerfIntegerMonitor(name, Units.BYTES, Variability.MONOTONIC, false, ib);
map.put(name, monitor);
this.overflow = (IntegerMonitor) monitor;
name = PerfDataBufferPrologue.PERFDATA_MODTIMESTAMP_NAME;
LongBuffer lb = prologue.modificationTimeStampBuffer();
monitor = new PerfLongMonitor(name, Units.TICKS, Variability.MONOTONIC, false, lb);
map.put(name, monitor);
}
/**
* method to repair the 1.4.2 parallel scavenge counters that are incorrectly initialized by the
* JVM when UseAdaptiveSizePolicy is set. This bug couldn't be fixed for 1.4.2 FCS due to putback
* restrictions.
*/
private void kludgeMantis(Map<String, Monitor> map, StringMonitor args) {
/*
* the HotSpot 1.4.2 JVM with the +UseParallelGC option along
* with its default +UseAdaptiveSizePolicy option has a bug with
* the initialization of the sizes of the eden and survivor spaces.
* See bugid 4890736.
*
* note - use explicit 1.4.2 counter names here - don't update
* to latest counter names or attempt to find aliases.
*/
String cname = "hotspot.gc.collector.0.name";
StringMonitor collector = (StringMonitor) map.get(cname);
if (collector.stringValue().compareTo("PSScavenge") == 0) {
boolean adaptiveSizePolicy = true;
/*
* HotSpot processes the -XX:Flags/.hotspotrc arguments prior to
* processing the command line arguments. This allows the command
* line arguments to override any defaults set in .hotspotrc
*/
cname = "hotspot.vm.flags";
StringMonitor flags = (StringMonitor) map.get(cname);
String allArgs = flags.stringValue() + " " + args.stringValue();
/*
* ignore the -XX: prefix as it only applies to the arguments
* passed from the command line (i.e. the invocation api).
* arguments passed through .hotspotrc omit the -XX: prefix.
*/
int ahi = allArgs.lastIndexOf("+AggressiveHeap");
int aspi = allArgs.lastIndexOf("-UseAdaptiveSizePolicy");
if (ahi != -1) {
/*
* +AggressiveHeap was set, check if -UseAdaptiveSizePolicy
* is set after +AggressiveHeap.
*/
//
if ((aspi != -1) && (aspi > ahi)) {
adaptiveSizePolicy = false;
}
} else {
/*
* +AggressiveHeap not set, must be +UseParallelGC. The
* relative position of -UseAdaptiveSizePolicy is not
* important in this case, as it will override the
* UseParallelGC default (+UseAdaptiveSizePolicy) if it
* appears anywhere in the JVM arguments.
*/
if (aspi != -1) {
adaptiveSizePolicy = false;
}
}
if (adaptiveSizePolicy) {
// adjust the buggy AdaptiveSizePolicy size counters.
// first remove the real counters.
String eden_size = "hotspot.gc.generation.0.space.0.size";
String s0_size = "hotspot.gc.generation.0.space.1.size";
String s1_size = "hotspot.gc.generation.0.space.2.size";
map.remove(eden_size);
map.remove(s0_size);
map.remove(s1_size);
// get the maximum new generation size
String new_max_name = "hotspot.gc.generation.0.capacity.max";
LongMonitor new_max = (LongMonitor) map.get(new_max_name);
/*
* replace the real counters with pseudo counters that are
* initialized to to the correct values. The maximum size of
* the eden and survivor spaces are supposed to be:
* max_eden_size = new_size - (2*alignment).
* max_survivor_size = new_size - (2*alignment).
* since we don't know the alignment value used, and because
* of other parallel scavenge bugs that result in oversized
* spaces, we just set the maximum size of each space to the
* full new gen size.
*/
Monitor monitor = null;
LongBuffer lb = LongBuffer.allocate(1);
lb.put(new_max.longValue());
monitor = new PerfLongMonitor(eden_size, Units.BYTES, Variability.CONSTANT, false, lb);
map.put(eden_size, monitor);
monitor = new PerfLongMonitor(s0_size, Units.BYTES, Variability.CONSTANT, false, lb);
map.put(s0_size, monitor);
monitor = new PerfLongMonitor(s1_size, Units.BYTES, Variability.CONSTANT, false, lb);
map.put(s1_size, monitor);
}
}
}
