Changeset 41660 in webkit for trunk/JavaScriptCore/wtf/TCSystemAlloc.h

Timestamp:

Mar 12, 2009, 8:33:27 PM (16 years ago)

Author:

[email protected]

Message:

<rdar://problem/6548446> TCMalloc_SystemRelease should use madvise rather than re-mmaping span of pages

• wtf/FastMalloc.cpp:

(WTF::mergeDecommittedStates): If either of the spans has been released to the system, release the other
span as well so that the flag in the merged span is accurate.

• wtf/Platform.h:
• wtf/TCSystemAlloc.cpp: Track decommitted spans when using MADV_FREE_REUSABLE / MADV_FREE_REUSE.

(TCMalloc_SystemRelease): Use madvise with MADV_FREE_REUSABLE when it is available.
(TCMalloc_SystemCommit): Use madvise with MADV_FREE_REUSE when it is available.

• wtf/TCSystemAlloc.h:

File:

• trunk/JavaScriptCore/wtf/TCSystemAlloc.h (modified) (1 diff)

trunk/JavaScriptCore/wtf/TCSystemAlloc.h

@@ -63 +63 @@
 extern void TCMalloc_SystemRelease(void* start, size_t length);
 
-#if HAVE(VIRTUALALLOC)
 extern void TCMalloc_SystemCommit(void* start, size_t length);
-#else
+
+#if !HAVE(MADV_FREE_REUSE) && !HAVE(MADV_DONTNEED) && !HAVE(MMAP)
+inline void TCMalloc_SystemRelease(void*, size_t) { }
+#endif
+
+#if !HAVE(VIRTUALALLOC) && !HAVE(MADV_FREE_REUSE)
 inline void TCMalloc_SystemCommit(void*, size_t) { }
 #endif