diff options
Diffstat (limited to 'third_party/tcmalloc/vendor/src/google/malloc_extension.h')
| -rw-r--r-- | third_party/tcmalloc/vendor/src/google/malloc_extension.h | 74 |
1 files changed, 10 insertions, 64 deletions
diff --git a/third_party/tcmalloc/vendor/src/google/malloc_extension.h b/third_party/tcmalloc/vendor/src/google/malloc_extension.h index 0342843..bc53e0f 100644 --- a/third_party/tcmalloc/vendor/src/google/malloc_extension.h +++ b/third_party/tcmalloc/vendor/src/google/malloc_extension.h @@ -42,13 +42,6 @@ #define BASE_MALLOC_EXTENSION_H_ #include <stddef.h> -// I can't #include config.h in this public API file, but I should -// really use configure (and make malloc_extension.h a .in file) to -// figure out if the system has stdint.h or not. But I'm lazy, so -// for now I'm assuming it's a problem only with MSVC. -#ifndef _MSC_VER -#include <stdint.h> -#endif #include <string> // Annoying stuff for windows -- makes sure clients can import these functions @@ -65,10 +58,6 @@ static const int kMallocHistogramSize = 64; // One day, we could support other types of writers (perhaps for C?) typedef std::string MallocExtensionWriter; -namespace base { -struct MallocRange; -} - // The default implementations of the following routines do nothing. // All implementations should be thread-safe; the current one // (TCMallocImplementation) is. @@ -110,14 +99,6 @@ class PERFTOOLS_DLL_DECL MallocExtension { // be passed to "pprof". virtual void GetHeapGrowthStacks(MallocExtensionWriter* writer); - // Invokes func(arg, range) for every controlled memory - // range. *range is filled in with information about the range. - // - // This is a best-effort interface useful only for performance - // analysis. The implementation may not call func at all. - typedef void (RangeFunction)(void*, const base::MallocRange*); - virtual void Ranges(void* arg, RangeFunction func); - // ------------------------------------------------------------------- // Control operations for getting and setting malloc implementation // specific parameters. Some currently useful properties: @@ -146,20 +127,12 @@ class PERFTOOLS_DLL_DECL MallocExtension { // 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. It is - // the sum of pageheap_free_bytes and pageheap_unmapped_bytes. - // This property is not writable. - // - // "tcmalloc.pageheap_free_bytes" - // Number of bytes in free, mapped pages in pageheap - // This property is not writable. - // - // "tcmalloc.pageheap_unmapped_bytes" - // Number of bytes in free, unmapped pages in pageheap + // 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 @@ -194,14 +167,12 @@ class PERFTOOLS_DLL_DECL MallocExtension { // Most malloc implementations ignore this routine. virtual void MarkThreadBusy(); - // Try to release num_bytes of free memory back to the operating - // system for reuse. Use this extension with caution -- to get this - // memory back may require faulting pages back in by the OS, and - // that may be slow. (Currently only implemented in tcmalloc.) - // A negative values for num_bytes results in a noop. - virtual void ReleaseToSystem(ssize_t num_bytes); - - // Same as ReleaseToSystem() but release as much memory as possible. + // 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. @@ -268,29 +239,4 @@ class PERFTOOLS_DLL_DECL MallocExtension { virtual void** ReadHeapGrowthStackTraces(); }; -namespace base { - -// Information passed per range. More fields may be added later. -struct MallocRange { - enum Type { - INUSE, // Application is using this range - FREE, // Range is currently free - UNMAPPED, // Backing physical memory has been returned to the OS - UNKNOWN, - // More enum values may be added in the future - }; - - uintptr_t address; // Address of range - size_t length; // Byte length of range - Type type; // Type of this range - double fraction; // Fraction of range that is being used (0 if !INUSE) - - // Perhaps add the following: - // - stack trace if this range was sampled - // - heap growth stack trace if applicable to this range - // - age when allocated (for inuse) or freed (if not in use) -}; - -} // namespace base - #endif // BASE_MALLOC_EXTENSION_H_ |