jdk8-mips64-public/hotspot: comparison src/share/vm/runtime/perfData.hpp

--1:000000000000
+:f90c822e73f8
+/*
+* Copyright (c) 2001, 2013, 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.
+*
+*/
+#ifndef SHARE_VM_RUNTIME_PERFDATA_HPP
+#define SHARE_VM_RUNTIME_PERFDATA_HPP
+#include "memory/allocation.inline.hpp"
+#include "runtime/perfMemory.hpp"
+#include "runtime/timer.hpp"
+#include "utilities/growableArray.hpp"
+/* jvmstat global and subsystem counter name space - enumeration value
+* serve as an index into the PerfDataManager::_name_space[] array
+* containing the corresponding name space string. Only the top level
+* subsystem name spaces are represented here.
+*/
+enum CounterNS {
+// top level name spaces
+JAVA_NS,
+COM_NS,
+SUN_NS,
+// subsystem name spaces
+JAVA_GC,              // Garbage Collection name spaces
+COM_GC,
+SUN_GC,
+JAVA_CI,              // Compiler name spaces
+COM_CI,
+SUN_CI,
+JAVA_CLS,             // Class Loader name spaces
+COM_CLS,
+SUN_CLS,
+JAVA_RT,              // Runtime name spaces
+COM_RT,
+SUN_RT,
+JAVA_OS,              // Operating System name spaces
+COM_OS,
+SUN_OS,
+JAVA_THREADS,         // Threads System name spaces
+COM_THREADS,
+SUN_THREADS,
+JAVA_PROPERTY,        // Java Property name spaces
+COM_PROPERTY,
+SUN_PROPERTY,
+NULL_NS,
+COUNTERNS_LAST = NULL_NS
+};
+/*
+* Classes to support access to production performance data
+*
+* The PerfData class structure is provided for creation, access, and update
+* of performance data (a.k.a. instrumentation) in a specific memory region
+* which is possibly accessible as shared memory. Although not explicitly
+* prevented from doing so, developers should not use the values returned
+* by accessor methods to make algorithmic decisions as they are potentially
+* extracted from a shared memory region. Although any shared memory region
+* created is with appropriate access restrictions, allowing read-write access
+* only to the principal that created the JVM, it is believed that a the
+* shared memory region facilitates an easier attack path than attacks
+* launched through mechanisms such as /proc. For this reason, it is
+* recommended that data returned by PerfData accessor methods be used
+* cautiously.
+*
+* There are three variability classifications of performance data
+*   Constants  -  value is written to the PerfData memory once, on creation
+*   Variables  -  value is modifiable, with no particular restrictions
+*   Counters   -  value is monotonically changing (increasing or decreasing)
+*
+* The performance data items can also have various types. The class
+* hierarchy and the structure of the memory region are designed to
+* accommodate new types as they are needed. Types are specified in
+* terms of Java basic types, which accommodates client applications
+* written in the Java programming language. The class hierarchy is:
+*
+* - PerfData (Abstract)
+*     - PerfLong (Abstract)
+*         - PerfLongConstant        (alias: PerfConstant)
+*         - PerfLongVariant (Abstract)
+*             - PerfLongVariable    (alias: PerfVariable)
+*             - PerfLongCounter     (alias: PerfCounter)
+*
+*     - PerfByteArray (Abstract)
+*         - PerfString (Abstract)
+*             - PerfStringVariable
+*             - PerfStringConstant
+*
+*
+* As seen in the class hierarchy, the initially supported types are:
+*
+*    Long      - performance data holds a Java long type
+*    ByteArray - performance data holds an array of Java bytes
+*                used for holding C++ char arrays.
+*
+* The String type is derived from the ByteArray type.
+*
+* A PerfData subtype is not required to provide an implementation for
+* each variability classification. For example, the String type provides
+* Variable and Constant variablility classifications in the PerfStringVariable
+* and PerfStringConstant classes, but does not provide a counter type.
+*
+* Performance data are also described by a unit of measure. Units allow
+* client applications to make reasonable decisions on how to treat
+* performance data generically, preventing the need to hard-code the
+* specifics of a particular data item in client applications. The current
+* set of units are:
+*
+*   None        - the data has no units of measure
+*   Bytes       - data is measured in bytes
+*   Ticks       - data is measured in clock ticks
+*   Events      - data is measured in events. For example,
+*                 the number of garbage collection events or the
+*                 number of methods compiled.
+*   String      - data is not numerical. For example,
+*                 the java command line options
+*   Hertz       - data is a frequency
+*
+* The performance counters also provide a support attribute, indicating
+* the stability of the counter as a programmatic interface. The support
+* level is also implied by the name space in which the counter is created.
+* The counter name space support conventions follow the Java package, class,
+* and property support conventions:
+*
+*    java.*          - stable, supported interface
+*    com.sun.*       - unstable, supported interface
+*    sun.*           - unstable, unsupported interface
+*
+* In the above context, unstable is a measure of the interface support
+* level, not the implementation stability level.
+*
+* Currently, instances of PerfData subtypes are considered to have
+* a life time equal to that of the VM and are managed by the
+* PerfDataManager class. All constructors for the PerfData class and
+* its subtypes have protected constructors. Creation of PerfData
+* instances is performed by invoking various create methods on the
+* PerfDataManager class. Users should not attempt to delete these
+* instances as the PerfDataManager class expects to perform deletion
+* operations on exit of the VM.
+*
+* Examples:
+*
+* Creating performance counter that holds a monotonically increasing
+* long data value with units specified in U_Bytes in the "java.gc.*"
+* name space.
+*
+*   PerfLongCounter* foo_counter;
+*
+*   foo_counter = PerfDataManager::create_long_counter(JAVA_GC, "foo",
+*                                                       PerfData::U_Bytes,
+*                                                       optionalInitialValue,
+*                                                       CHECK);
+*   foo_counter->inc();
+*
+* Creating a performance counter that holds a variably change long
+* data value with untis specified in U_Bytes in the "com.sun.ci
+* name space.
+*
+*   PerfLongVariable* bar_varible;
+*   bar_variable = PerfDataManager::create_long_variable(COM_CI, "bar",
+.*                                                        PerfData::U_Bytes,
+*                                                        optionalInitialValue,
+*                                                        CHECK);
+*
+*   bar_variable->inc();
+*   bar_variable->set_value(0);
+*
+* Creating a performance counter that holds a constant string value in
+* the "sun.cls.*" name space.
+*
+*   PerfDataManager::create_string_constant(SUN_CLS, "foo", string, CHECK);
+*
+*   Although the create_string_constant() factory method returns a pointer
+*   to the PerfStringConstant object, it can safely be ignored. Developers
+*   are not encouraged to access the string constant's value via this
+*   pointer at this time due to security concerns.
+*
+* Creating a performance counter in an arbitrary name space that holds a
+* value that is sampled by the StatSampler periodic task.
+*
+*    PerfDataManager::create_counter("foo.sampled", PerfData::U_Events,
+*                                    &my_jlong, CHECK);
+*
+*    In this example, the PerfData pointer can be ignored as the caller
+*    is relying on the StatSampler PeriodicTask to sample the given
+*    address at a regular interval. The interval is defined by the
+*    PerfDataSamplingInterval global variable, and is applyied on
+*    a system wide basis, not on an per-counter basis.
+*
+* Creating a performance counter in an arbitrary name space that utilizes
+* a helper object to return a value to the StatSampler via the take_sample()
+* method.
+*
+*     class MyTimeSampler : public PerfLongSampleHelper {
+*       public:
+*         jlong take_sample() { return os::elapsed_counter(); }
+*     };
+*
+*     PerfDataManager::create_counter(SUN_RT, "helped",
+*                                     PerfData::U_Ticks,
+*                                     new MyTimeSampler(), CHECK);
+*
+*     In this example, a subtype of PerfLongSampleHelper is instantiated
+*     and its take_sample() method is overridden to perform whatever
+*     operation is necessary to generate the data sample. This method
+*     will be called by the StatSampler at a regular interval, defined
+*     by the PerfDataSamplingInterval global variable.
+*
+*     As before, PerfSampleHelper is an alias for PerfLongSampleHelper.
+*
+* For additional uses of PerfData subtypes, see the utility classes
+* PerfTraceTime and PerfTraceTimedEvent below.
+*
+* Always-on non-sampled counters can be created independent of
+* the UsePerfData flag. Counters will be created on the c-heap
+* if UsePerfData is false.
+*
+* Until further noice, all PerfData objects should be created and
+* manipulated within a guarded block. The guard variable is
+* UsePerfData, a product flag set to true by default. This flag may
+* be removed from the product in the future.
+*
+*/
+class PerfData : public CHeapObj<mtInternal> {
+friend class StatSampler;      // for access to protected void sample()
+friend class PerfDataManager;  // for access to protected destructor
+public:
+// the Variability enum must be kept in synchronization with the
+// the com.sun.hotspot.perfdata.Variability class
+enum Variability {
+V_Constant = 1,
+V_Monotonic = 2,
+V_Variable = 3,
+V_last = V_Variable
+};
+// the Units enum must be kept in synchronization with the
+// the com.sun.hotspot.perfdata.Units class
+enum Units {
+U_None = 1,
+U_Bytes = 2,
+U_Ticks = 3,
+U_Events = 4,
+U_String = 5,
+U_Hertz = 6,
+U_Last = U_Hertz
+};
+// Miscellaneous flags
+enum Flags {
+F_None = 0x0,
+F_Supported = 0x1    // interface is supported - java.* and com.sun.*
+};
+private:
+char* _name;
+Variability _v;
+Units _u;
+bool _on_c_heap;
+Flags _flags;
+PerfDataEntry* _pdep;
+protected:
+void *_valuep;
+PerfData(CounterNS ns, const char* name, Units u, Variability v);
+~PerfData();
+// create the entry for the PerfData item in the PerfData memory region.
+// this region is maintained separately from the PerfData objects to
+// facilitate its use by external processes.
+void create_entry(BasicType dtype, size_t dsize, size_t dlen = 0);
+// sample the data item given at creation time and write its value
+// into the its corresponding PerfMemory location.
+virtual void sample() = 0;
+public:
+// returns a boolean indicating the validity of this object.
+// the object is valid if and only if memory in PerfMemory
+// region was successfully allocated.
+inline bool is_valid() { return _valuep != NULL; }
+// returns a boolean indicating whether the underlying object
+// was allocated in the PerfMemory region or on the C heap.
+inline bool is_on_c_heap() { return _on_c_heap; }
+// returns a pointer to a char* containing the name of the item.
+// The pointer returned is the pointer to a copy of the name
+// passed to the constructor, not the pointer to the name in the
+// PerfData memory region. This redundancy is maintained for
+// security reasons as the PerfMemory region may be in shared
+// memory.
+const char* name() { return _name; }
+// returns the variability classification associated with this item
+Variability variability() { return _v; }
+// returns the units associated with this item.
+Units units() { return _u; }
+// returns the flags associated with this item.
+Flags flags() { return _flags; }
+// returns the address of the data portion of the item in the
+// PerfData memory region.
+inline void* get_address() { return _valuep; }
+// returns the value of the data portion of the item in the
+// PerfData memory region formatted as a string.
+virtual int format(char* cp, int length) = 0;
+};
+/*
+* PerfLongSampleHelper, and its alias PerfSamplerHelper, is a base class
+* for helper classes that rely upon the StatSampler periodic task to
+* invoke the take_sample() method and write the value returned to its
+* appropriate location in the PerfData memory region.
+*/
+class PerfLongSampleHelper : public CHeapObj<mtInternal> {
+public:
+virtual jlong take_sample() = 0;
+};
+typedef PerfLongSampleHelper PerfSampleHelper;
+/*
+* PerfLong is the base class for the various Long PerfData subtypes.
+* it contains implementation details that are common among its derived
+* types.
+*/
+class PerfLong : public PerfData {
+protected:
+PerfLong(CounterNS ns, const char* namep, Units u, Variability v);
+public:
+int format(char* buffer, int length);
+// returns the value of the data portion of the item in the
+// PerfData memory region.
+inline jlong get_value() { return *(jlong*)_valuep; }
+};
+/*
+* The PerfLongConstant class, and its alias PerfConstant, implement
+* a PerfData subtype that holds a jlong data value that is set upon
+* creation of an instance of this class. This class provides no
+* methods for changing the data value stored in PerfData memory region.
+*/
+class PerfLongConstant : public PerfLong {
+friend class PerfDataManager; // for access to protected constructor
+private:
+// hide sample() - no need to sample constants
+void sample() { }
+protected:
+PerfLongConstant(CounterNS ns, const char* namep, Units u,
+jlong initial_value=0)
+: PerfLong(ns, namep, u, V_Constant) {
+if (is_valid()) *(jlong*)_valuep = initial_value;
+}
+};
+typedef PerfLongConstant PerfConstant;
+/*
+* The PerfLongVariant class, and its alias PerfVariant, implement
+* a PerfData subtype that holds a jlong data value that can be modified
+* in an unrestricted manner. This class provides the implementation details
+* for common functionality among its derived types.
+*/
+class PerfLongVariant : public PerfLong {
+protected:
+jlong* _sampled;
+PerfLongSampleHelper* _sample_helper;
+PerfLongVariant(CounterNS ns, const char* namep, Units u, Variability v,
+jlong initial_value=0)
+: PerfLong(ns, namep, u, v) {
+if (is_valid()) *(jlong*)_valuep = initial_value;
+}
+PerfLongVariant(CounterNS ns, const char* namep, Units u, Variability v,
+jlong* sampled);
+PerfLongVariant(CounterNS ns, const char* namep, Units u, Variability v,
+PerfLongSampleHelper* sample_helper);
+void sample();
+public:
+inline void inc() { (*(jlong*)_valuep)++; }
+inline void inc(jlong val) { (*(jlong*)_valuep) += val; }
+inline void add(jlong val) { (*(jlong*)_valuep) += val; }
+void clear_sample_helper() { _sample_helper = NULL; }
+};
+/*
+* The PerfLongCounter class, and its alias PerfCounter, implement
+* a PerfData subtype that holds a jlong data value that can (should)
+* be modified in a monotonic manner. The inc(jlong) and add(jlong)
+* methods can be passed negative values to implement a monotonically
+* decreasing value. However, we rely upon the programmer to honor
+* the notion that this counter always moves in the same direction -
+* either increasing or decreasing.
+*/
+class PerfLongCounter : public PerfLongVariant {
+friend class PerfDataManager; // for access to protected constructor
+protected:
+PerfLongCounter(CounterNS ns, const char* namep, Units u,
+jlong initial_value=0)
+: PerfLongVariant(ns, namep, u, V_Monotonic,
+initial_value) { }
+PerfLongCounter(CounterNS ns, const char* namep, Units u, jlong* sampled)
+: PerfLongVariant(ns, namep, u, V_Monotonic, sampled) { }
+PerfLongCounter(CounterNS ns, const char* namep, Units u,
+PerfLongSampleHelper* sample_helper)
+: PerfLongVariant(ns, namep, u, V_Monotonic,
+sample_helper) { }
+};
+typedef PerfLongCounter PerfCounter;
+/*
+* The PerfLongVariable class, and its alias PerfVariable, implement
+* a PerfData subtype that holds a jlong data value that can
+* be modified in an unrestricted manner.
+*/
+class PerfLongVariable : public PerfLongVariant {
+friend class PerfDataManager; // for access to protected constructor
+protected:
+PerfLongVariable(CounterNS ns, const char* namep, Units u,
+jlong initial_value=0)
+: PerfLongVariant(ns, namep, u, V_Variable,
+initial_value) { }
+PerfLongVariable(CounterNS ns, const char* namep, Units u, jlong* sampled)
+: PerfLongVariant(ns, namep, u, V_Variable, sampled) { }
+PerfLongVariable(CounterNS ns, const char* namep, Units u,
+PerfLongSampleHelper* sample_helper)
+: PerfLongVariant(ns, namep, u, V_Variable,
+sample_helper) { }
+public:
+inline void set_value(jlong val) { (*(jlong*)_valuep) = val; }
+};
+typedef PerfLongVariable PerfVariable;
+/*
+* The PerfByteArray provides a PerfData subtype that allows the creation
+* of a contiguous region of the PerfData memory region for storing a vector
+* of bytes. This class is currently intended to be a base class for
+* the PerfString class, and cannot be instantiated directly.
+*/
+class PerfByteArray : public PerfData {
+protected:
+jint _length;
+PerfByteArray(CounterNS ns, const char* namep, Units u, Variability v,
+jint length);
+};
+class PerfString : public PerfByteArray {
+protected:
+void set_string(const char* s2);
+PerfString(CounterNS ns, const char* namep, Variability v, jint length,
+const char* initial_value)
+: PerfByteArray(ns, namep, U_String, v, length) {
+if (is_valid()) set_string(initial_value);
+}
+public:
+int format(char* buffer, int length);
+};
+/*
+* The PerfStringConstant class provides a PerfData sub class that
+* allows a null terminated string of single byte characters to be
+* stored in the PerfData memory region.
+*/
+class PerfStringConstant : public PerfString {
+friend class PerfDataManager; // for access to protected constructor
+private:
+// hide sample() - no need to sample constants
+void sample() { }
+protected:
+// Restrict string constant lengths to be <= PerfMaxStringConstLength.
+// This prevents long string constants, as can occur with very
+// long classpaths or java command lines, from consuming too much
+// PerfData memory.
+PerfStringConstant(CounterNS ns, const char* namep,
+const char* initial_value);
+};
+/*
+* The PerfStringVariable class provides a PerfData sub class that
+* allows a null terminated string of single byte character data
+* to be stored in PerfData memory region. The string value can be reset
+* after initialization. If the string value is >= max_length, then
+* it will be truncated to max_length characters. The copied string
+* is always null terminated.
+*/
+class PerfStringVariable : public PerfString {
+friend class PerfDataManager; // for access to protected constructor
+protected:
+// sampling of string variables are not yet supported
+void sample() { }
+PerfStringVariable(CounterNS ns, const char* namep, jint max_length,
+const char* initial_value)
+: PerfString(ns, namep, V_Variable, max_length+1,
+initial_value) { }
+public:
+inline void set_value(const char* val) { set_string(val); }
+};
+/*
+* The PerfDataList class is a container class for managing lists
+* of PerfData items. The intention of this class is to allow for
+* alternative implementations for management of list of PerfData
+* items without impacting the code that uses the lists.
+*
+* The initial implementation is based upon GrowableArray. Searches
+* on GrowableArray types is linear in nature and this may become
+* a performance issue for creation of PerfData items, particularly
+* from Java code where a test for existence is implemented as a
+* search over all existing PerfData items.
+*
+* The abstraction is not complete. A more general container class
+* would provide an Iterator abstraction that could be used to
+* traverse the lists. This implementation still relys upon integer
+* iterators and the at(int index) method. However, the GrowableArray
+* is not directly visible outside this class and can be replaced by
+* some other implementation, as long as that implementation provides
+* a mechanism to iterate over the container by index.
+*/
+class PerfDataList : public CHeapObj<mtInternal> {
+private:
+// GrowableArray implementation
+typedef GrowableArray<PerfData*> PerfDataArray;
+PerfDataArray* _set;
+// method to search for a instrumentation object by name
+static bool by_name(void* name, PerfData* pd);
+protected:
+// we expose the implementation here to facilitate the clone
+// method.
+PerfDataArray* get_impl() { return _set; }
+public:
+// create a PerfDataList with the given initial length
+PerfDataList(int length);
+// create a PerfDataList as a shallow copy of the given PerfDataList
+PerfDataList(PerfDataList* p);
+~PerfDataList();
+// return the PerfData item indicated by name,
+// or NULL if it doesn't exist.
+PerfData* find_by_name(const char* name);
+// return true if a PerfData item with the name specified in the
+// argument exists, otherwise return false.
+bool contains(const char* name) { return find_by_name(name) != NULL; }
+// return the number of PerfData items in this list
+int length() { return _set->length(); }
+// add a PerfData item to this list
+void append(PerfData *p) { _set->append(p); }
+// remove the given PerfData item from this list. When called
+// while iterating over the list, this method will result in a
+// change in the length of the container. The at(int index)
+// method is also impacted by this method as elements with an
+// index greater than the index of the element removed by this
+// method will be shifted down by one.
+void remove(PerfData *p) { _set->remove(p); }
+// create a new PerfDataList from this list. The new list is
+// a shallow copy of the original list and care should be taken
+// with respect to delete operations on the elements of the list
+// as the are likely in use by another copy of the list.
+PerfDataList* clone();
+// for backward compatibility with GrowableArray - need to implement
+// some form of iterator to provide a cleaner abstraction for
+// iteration over the container.
+PerfData* at(int index) { return _set->at(index); }
+};
+/*
+* The PerfDataManager class is responsible for creating PerfData
+* subtypes via a set a factory methods and for managing lists
+* of the various PerfData types.
+*/
+class PerfDataManager : AllStatic {
+friend class StatSampler;   // for access to protected PerfDataList methods
+private:
+static PerfDataList* _all;
+static PerfDataList* _sampled;
+static PerfDataList* _constants;
+static const char* _name_spaces[];
+// add a PerfData item to the list(s) of know PerfData objects
+static void add_item(PerfData* p, bool sampled);
+protected:
+// return the list of all known PerfData items
+static PerfDataList* all();
+static int count() { return _all->length(); }
+// return the list of all known PerfData items that are to be
+// sampled by the StatSampler.
+static PerfDataList* sampled();
+static int sampled_count() { return _sampled->length(); }
+// return the list of all known PerfData items that have a
+// variability classification of type Constant
+static PerfDataList* constants();
+static int constants_count() { return _constants->length(); }
+public:
+// method to check for the existence of a PerfData item with
+// the given name.
+static bool exists(const char* name) { return _all->contains(name); }
+// method to search for a instrumentation object by name
+static PerfData* find_by_name(const char* name);
+// method to map a CounterNS enumeration to a namespace string
+static const char* ns_to_string(CounterNS ns) {
+return _name_spaces[ns];
+}
+// methods to test the interface stability of a given counter namespace
+//
+static bool is_stable_supported(CounterNS ns) {
+return (ns != NULL_NS) && ((ns % 3) == JAVA_NS);
+}
+static bool is_unstable_supported(CounterNS ns) {
+return (ns != NULL_NS) && ((ns % 3) == COM_NS);
+}
+static bool is_unstable_unsupported(CounterNS ns) {
+return (ns == NULL_NS) || ((ns % 3) == SUN_NS);
+}
+// methods to test the interface stability of a given counter name
+//
+static bool is_stable_supported(const char* name) {
+const char* javadot = "java.";
+return strncmp(name, javadot, strlen(javadot)) == 0;
+}
+static bool is_unstable_supported(const char* name) {
+const char* comdot = "com.sun.";
+return strncmp(name, comdot, strlen(comdot)) == 0;
+}
+static bool is_unstable_unsupported(const char* name) {
+return !(is_stable_supported(name) && is_unstable_supported(name));
+}
+// method to construct counter name strings in a given name space.
+// The string object is allocated from the Resource Area and calls
+// to this method must be made within a ResourceMark.
+//
+static char* counter_name(const char* name_space, const char* name);
+// method to construct name space strings in a given name space.
+// The string object is allocated from the Resource Area and calls
+// to this method must be made within a ResourceMark.
+//
+static char* name_space(const char* name_space, const char* sub_space) {
+return counter_name(name_space, sub_space);
+}
+// same as above, but appends the instance number to the name space
+//
+static char* name_space(const char* name_space, const char* sub_space,
+int instance);
+static char* name_space(const char* name_space, int instance);
+// these methods provide the general interface for creating
+// performance data resources. The types of performance data
+// resources can be extended by adding additional create<type>
+// methods.
+// Constant Types
+static PerfStringConstant* create_string_constant(CounterNS ns,
+const char* name,
+const char *s, TRAPS);
+static PerfLongConstant* create_long_constant(CounterNS ns,
+const char* name,
+PerfData::Units u,
+jlong val, TRAPS);
+// Variable Types
+static PerfStringVariable* create_string_variable(CounterNS ns,
+const char* name,
+int max_length,
+const char *s, TRAPS);
+static PerfStringVariable* create_string_variable(CounterNS ns,
+const char* name,
+const char *s, TRAPS) {
+return create_string_variable(ns, name, 0, s, CHECK_NULL);
+};
+static PerfLongVariable* create_long_variable(CounterNS ns,
+const char* name,
+PerfData::Units u,
+jlong ival, TRAPS);
+static PerfLongVariable* create_long_variable(CounterNS ns,
+const char* name,
+PerfData::Units u, TRAPS) {
+return create_long_variable(ns, name, u, (jlong)0, CHECK_NULL);
+};
+static PerfLongVariable* create_long_variable(CounterNS, const char* name,
+PerfData::Units u,
+jlong* sp, TRAPS);
+static PerfLongVariable* create_long_variable(CounterNS ns,
+const char* name,
+PerfData::Units u,
+PerfLongSampleHelper* sh,
+TRAPS);
+// Counter Types
+static PerfLongCounter* create_long_counter(CounterNS ns, const char* name,
+PerfData::Units u,
+jlong ival, TRAPS);
+static PerfLongCounter* create_long_counter(CounterNS ns, const char* name,
+PerfData::Units u, TRAPS) {
+return create_long_counter(ns, name, u, (jlong)0, CHECK_NULL);
+};
+static PerfLongCounter* create_long_counter(CounterNS ns, const char* name,
+PerfData::Units u, jlong* sp,
+TRAPS);
+static PerfLongCounter* create_long_counter(CounterNS ns, const char* name,
+PerfData::Units u,
+PerfLongSampleHelper* sh,
+TRAPS);
+// these creation methods are provided for ease of use. These allow
+// Long performance data types to be created with a shorthand syntax.
+static PerfConstant* create_constant(CounterNS ns, const char* name,
+PerfData::Units u, jlong val, TRAPS) {
+return create_long_constant(ns, name, u, val, CHECK_NULL);
+}
+static PerfVariable* create_variable(CounterNS ns, const char* name,
+PerfData::Units u, jlong ival, TRAPS) {
+return create_long_variable(ns, name, u, ival, CHECK_NULL);
+}
+static PerfVariable* create_variable(CounterNS ns, const char* name,
+PerfData::Units u, TRAPS) {
+return create_long_variable(ns, name, u, (jlong)0, CHECK_NULL);
+}
+static PerfVariable* create_variable(CounterNS ns, const char* name,
+PerfData::Units u, jlong* sp, TRAPS) {
+return create_long_variable(ns, name, u, sp, CHECK_NULL);
+}
+static PerfVariable* create_variable(CounterNS ns, const char* name,
+PerfData::Units u,
+PerfSampleHelper* sh, TRAPS) {
+return create_long_variable(ns, name, u, sh, CHECK_NULL);
+}
+static PerfCounter* create_counter(CounterNS ns, const char* name,
+PerfData::Units u, jlong ival, TRAPS) {
+return create_long_counter(ns, name, u, ival, CHECK_NULL);
+}
+static PerfCounter* create_counter(CounterNS ns, const char* name,
+PerfData::Units u, TRAPS) {
+return create_long_counter(ns, name, u, (jlong)0, CHECK_NULL);
+}
+static PerfCounter* create_counter(CounterNS ns, const char* name,
+PerfData::Units u, jlong* sp, TRAPS) {
+return create_long_counter(ns, name, u, sp, CHECK_NULL);
+}
+static PerfCounter* create_counter(CounterNS ns, const char* name,
+PerfData::Units u,
+PerfSampleHelper* sh, TRAPS) {
+return create_long_counter(ns, name, u, sh, CHECK_NULL);
+}
+static void destroy();
+};
+// Useful macros to create the performance counters
+#define NEWPERFTICKCOUNTER(counter, counter_ns, counter_name)  \
+{counter = PerfDataManager::create_counter(counter_ns, counter_name, \
+PerfData::U_Ticks,CHECK);}
+#define NEWPERFEVENTCOUNTER(counter, counter_ns, counter_name)  \
+{counter = PerfDataManager::create_counter(counter_ns, counter_name, \
+PerfData::U_Events,CHECK);}
+#define NEWPERFBYTECOUNTER(counter, counter_ns, counter_name)  \
+{counter = PerfDataManager::create_counter(counter_ns, counter_name, \
+PerfData::U_Bytes,CHECK);}
+// Utility Classes
+/*
+* this class will administer a PerfCounter used as a time accumulator
+* for a basic block much like the TraceTime class.
+*
+* Example:
+*
+*    static PerfCounter* my_time_counter = PerfDataManager::create_counter("my.time.counter", PerfData::U_Ticks, 0LL, CHECK);
+*
+*    {
+*      PerfTraceTime ptt(my_time_counter);
+*      // perform the operation you want to measure
+*    }
+*
+* Note: use of this class does not need to occur within a guarded
+* block. The UsePerfData guard is used with the implementation
+* of this class.
+*/
+class PerfTraceTime : public StackObj {
+protected:
+elapsedTimer _t;
+PerfLongCounter* _timerp;
+// pointer to thread-local or global recursion counter variable
+int* _recursion_counter;
+public:
+inline PerfTraceTime(PerfLongCounter* timerp) : _timerp(timerp), _recursion_counter(NULL) {
+if (!UsePerfData) return;
+_t.start();
+}
+inline PerfTraceTime(PerfLongCounter* timerp, int* recursion_counter) : _timerp(timerp), _recursion_counter(recursion_counter) {
+if (!UsePerfData || (_recursion_counter != NULL &&
+(*_recursion_counter)++ > 0)) return;
+_t.start();
+}
+inline void suspend() { if (!UsePerfData) return; _t.stop(); }
+inline void resume() { if (!UsePerfData) return; _t.start(); }
+inline ~PerfTraceTime() {
+if (!UsePerfData || (_recursion_counter != NULL &&
+--(*_recursion_counter) > 0)) return;
+_t.stop();
+_timerp->inc(_t.ticks());
+}
+};
+/* The PerfTraceTimedEvent class is responsible for counting the
+* occurrence of some event and measuring the the elapsed time of
+* the event in two separate PerfCounter instances.
+*
+* Example:
+*
+*    static PerfCounter* my_time_counter = PerfDataManager::create_counter("my.time.counter", PerfData::U_Ticks, CHECK);
+*    static PerfCounter* my_event_counter = PerfDataManager::create_counter("my.event.counter", PerfData::U_Events, CHECK);
+*
+*    {
+*      PerfTraceTimedEvent ptte(my_time_counter, my_event_counter);
+*      // perform the operation you want to count and measure
+*    }
+*
+* Note: use of this class does not need to occur within a guarded
+* block. The UsePerfData guard is used with the implementation
+* of this class.
+*
+*/
+class PerfTraceTimedEvent : public PerfTraceTime {
+protected:
+PerfLongCounter* _eventp;
+public:
+inline PerfTraceTimedEvent(PerfLongCounter* timerp, PerfLongCounter* eventp): PerfTraceTime(timerp), _eventp(eventp) {
+if (!UsePerfData) return;
+_eventp->inc();
+}
+inline PerfTraceTimedEvent(PerfLongCounter* timerp, PerfLongCounter* eventp, int* recursion_counter): PerfTraceTime(timerp, recursion_counter), _eventp(eventp) {
+if (!UsePerfData) return;
+_eventp->inc();
+}
+};
+#endif // SHARE_VM_RUNTIME_PERFDATA_HPP

Mercurial > jdk8-mips64-public > hotspot / file comparison

comparison: src/share/vm/runtime/perfData.hpp

src/share/vm/runtime/perfData.hpp