Rollback Scavenge implemetation and rely on existing functionality to free...

third_party/tcmalloc/google/malloc_extension.h

Index: third_party/tcmalloc/google/malloc_extension.h
===================================================================
--- third_party/tcmalloc/google/malloc_extension.h	(revision 27611)
+++ third_party/tcmalloc/google/malloc_extension.h	(working copy)
@@ -1,239 +0,0 @@
-// Copyright (c) 2005, Google Inc.
-// All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// ---
-// Author: Sanjay Ghemawat <opensource@google.com>
-//
-// Extra extensions exported by some malloc implementations.  These
-// extensions are accessed through a virtual base class so an
-// application can link against a malloc that does not implement these
-// extensions, and it will get default versions that do nothing.
-//
-// NOTE FOR C USERS: If you wish to use this functionality from within
-// a C program, see malloc_extension_c.h.
-
-#ifndef BASE_MALLOC_EXTENSION_H_
-#define BASE_MALLOC_EXTENSION_H_
-
-#include <stddef.h>
-#include <string>
-
-// Annoying stuff for windows -- makes sure clients can import these functions
-#ifndef PERFTOOLS_DLL_DECL
-# ifdef _WIN32
-#   define PERFTOOLS_DLL_DECL  __declspec(dllimport)
-# else
-#   define PERFTOOLS_DLL_DECL
-# endif
-#endif
-
-static const int kMallocHistogramSize = 64;
-
-// One day, we could support other types of writers (perhaps for C?)
-typedef std::string MallocExtensionWriter;
-
-// The default implementations of the following routines do nothing.
-// All implementations should be thread-safe; the current one
-// (TCMallocImplementation) is.
-class PERFTOOLS_DLL_DECL MallocExtension {
- public:
-  virtual ~MallocExtension();
-
-  // Call this very early in the program execution -- say, in a global
-  // constructor -- to set up parameters and state needed by all
-  // instrumented malloc implemenatations.  One example: this routine
-  // sets environemnt variables to tell STL to use libc's malloc()
-  // instead of doing its own memory management.  This is safe to call
-  // multiple times, as long as each time is before threads start up.
-  static void Initialize();
-
-  // See "verify_memory.h" to see what these routines do
-  virtual bool VerifyAllMemory();
-  virtual bool VerifyNewMemory(void* p);
-  virtual bool VerifyArrayNewMemory(void* p);
-  virtual bool VerifyMallocMemory(void* p);
-  virtual bool MallocMemoryStats(int* blocks, size_t* total,
-                                 int histogram[kMallocHistogramSize]);
-
-  // Get a human readable description of the current state of the malloc
-  // data structures.  The state is stored as a null-terminated string
-  // in a prefix of "buffer[0,buffer_length-1]".
-  // REQUIRES: buffer_length > 0.
-  virtual void GetStats(char* buffer, int buffer_length);
-
-  // Outputs to "writer" a sample of live objects and the stack traces
-  // that allocated these objects.  The format of the returned output
-  // is equivalent to the output of the heap profiler and can
-  // therefore be passed to "pprof".
-  virtual void GetHeapSample(MallocExtensionWriter* writer);
-
-  // Outputs to "writer" the stack traces that caused growth in the
-  // address space size.  The format of the returned output is
-  // equivalent to the output of the heap profiler and can therefore
-  // be passed to "pprof".
-  virtual void GetHeapGrowthStacks(MallocExtensionWriter* writer);
-
-  // -------------------------------------------------------------------
-  // Control operations for getting and setting malloc implementation
-  // specific parameters.  Some currently useful properties:
-  //
-  // generic
-  // -------
-  // "generic.current_allocated_bytes"
-  //      Number of bytes currently allocated by application
-  //      This property is not writable.
-  //
-  // "generic.heap_size"
-  //      Number of bytes in the heap ==
-  //            current_allocated_bytes +
-  //            fragmentation +
-  //            freed memory regions
-  //      This property is not writable.
-  //
-  // tcmalloc
-  // --------
-  // "tcmalloc.max_total_thread_cache_bytes"
-  //      Upper limit on total number of bytes stored across all
-  //      per-thread caches.  Default: 16MB.
-  //
-  // "tcmalloc.current_total_thread_cache_bytes"
-  //      Number of bytes used across all thread caches.
-  //      This property is not writable.
-  //
-  // "tcmalloc.slack_bytes"
-  //      Number of bytes allocated from system, but not currently
-  //      in use by malloced objects.  I.e., bytes available for
-  //      allocation without needing more bytes from system.
-  //      This property is not writable.
-  //
-  // TODO: Add more properties as necessary
-  // -------------------------------------------------------------------
-
-  // Get the named "property"'s value.  Returns true if the property
-  // is known.  Returns false if the property is not a valid property
-  // name for the current malloc implementation.
-  // REQUIRES: property != NULL; value != NULL
-  virtual bool GetNumericProperty(const char* property, size_t* value);
-
-  // Set the named "property"'s value.  Returns true if the property
-  // is known and writable.  Returns false if the property is not a
-  // valid property name for the current malloc implementation, or
-  // is not writable.
-  // REQUIRES: property != NULL
-  virtual bool SetNumericProperty(const char* property, size_t value);
-
-  // Mark the current thread as "idle".  This routine may optionally
-  // be called by threads as a hint to the malloc implementation that
-  // any thread-specific resources should be released.  Note: this may
-  // be an expensive routine, so it should not be called too often.
-  //
-  // Also, if the code that calls this routine will go to sleep for
-  // a while, it should take care to not allocate anything between
-  // the call to this routine and the beginning of the sleep.
-  //
-  // Most malloc implementations ignore this routine.
-  virtual void MarkThreadIdle();
-
-  // Scavenge at least some resources and free them back to OS.
-  // This method doesn't promise to do anything useful (it might be
-  // implemented as noop), but it's a good idea to invoke it when
-  // application is idle.
-  virtual void Scavenge();
-
-  // Try to free memory back to the operating system for reuse.  Only
-  // use this extension if the application has recently freed a lot of
-  // memory, and does not anticipate using it again for a long time --
-  // to get this memory back may require faulting pages back in by the
-  // OS, and that may be slow.  (Currently only implemented in
-  // tcmalloc.)
-  virtual void ReleaseFreeMemory();
-
-  // Sets the rate at which we release unused memory to the system.
-  // Zero means we never release memory back to the system.  Increase
-  // this flag to return memory faster; decrease it to return memory
-  // slower.  Reasonable rates are in the range [0,10].  (Currently
-  // only implemented in tcmalloc).
-  virtual void SetMemoryReleaseRate(double rate);
-
-  // Gets the release rate.  Returns a value < 0 if unknown.
-  virtual double GetMemoryReleaseRate();
-
-  // Returns the estimated number of bytes that will be allocated for
-  // a request of "size" bytes.  This is an estimate: an allocation of
-  // SIZE bytes may reserve more bytes, but will never reserve less.
-  // (Currently only implemented in tcmalloc, other implementations
-  // always return SIZE.)
-  virtual size_t GetEstimatedAllocatedSize(size_t size);
-
-  // Returns the actual number of bytes reserved by tcmalloc for the
-  // pointer p.  This number may be equal to or greater than
-  // the number of bytes requested when p was allocated.
-  // p must have been allocated by this malloc implementation,
-  // must not be an interior pointer -- that is, must be exactly
-  // the pointer returned to by malloc() et al., not some offset
-  // from that -- and should not have been freed yet.  p may be NULL.
-  // (Currently only implemented in tcmalloc; other implementations
-  // will return 0.)
-  virtual size_t GetAllocatedSize(void* p);
-
-  // The current malloc implementation.  Always non-NULL.
-  static MallocExtension* instance();
-
-  // Change the malloc implementation.  Typically called by the
-  // malloc implementation during initialization.
-  static void Register(MallocExtension* implementation);
-
- protected:
-  // Get a list of stack traces of sampled allocation points.  Returns
-  // a pointer to a "new[]-ed" result array, and stores the sample
-  // period in "sample_period".
-  //
-  // The state is stored as a sequence of adjacent entries
-  // in the returned array.  Each entry has the following form:
-  //    uintptr_t count;        // Number of objects with following trace
-  //    uintptr_t size;         // Total size of objects with following trace
-  //    uintptr_t depth;        // Number of PC values in stack trace
-  //    void*     stack[depth]; // PC values that form the stack trace
-  //
-  // The list of entries is terminated by a "count" of 0.
-  //
-  // It is the responsibility of the caller to "delete[]" the returned array.
-  //
-  // May return NULL to indicate no results.
-  //
-  // This is an internal extension.  Callers should use the more
-  // convenient "GetHeapSample(string*)" method defined above.
-  virtual void** ReadStackTraces(int* sample_period);
-
-  // Like ReadStackTraces(), but returns stack traces that caused growth
-  // in the address space size.
-  virtual void** ReadHeapGrowthStackTraces();
-};
-
-#endif  // BASE_MALLOC_EXTENSION_H_