jdk8-mips64-public/hotspot: src/share/vm/runtime/perfData.hpp@eef07cd490d4 (annotated)

src/share/vm/runtime/perfData.hpp@eef07cd490d4 (annotated)

src/share/vm/runtime/perfData.hpp

Wed, 03 Jul 2019 20:42:37 +0800

author: aoqi
date: Wed, 03 Jul 2019 20:42:37 +0800
changeset 9637: eef07cd490d4
parent 6876: 710a3c8b516e
permissions: -rw-r--r--

Merge

 /*
  * 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 / annotate

src/share/vm/runtime/perfData.hpp@eef07cd490d4 (annotated)

src/share/vm/runtime/perfData.hpp