/* * Copyright 2001-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ /* 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 { 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 { 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; } }; /* * 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 { private: // GrowableArray implementation typedef GrowableArray 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 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 // 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(); } };