Changeset 34756 in webkit for trunk/JavaScriptCore/wtf/TCSystemAlloc.h

Timestamp:

Jun 23, 2008, 10:34:24 PM (17 years ago)

Author:

[email protected]

Message:

Prepration for returning memory to the OS on Windows. Track whether a portion of a span of memory was returned to the OS.
If it was, ask that it be recommitted before returning it to the application as an allocated region.

Reviewed by Oliver Hunt.

• wtf/FastMalloc.cpp:

(WTF::TCMalloc_PageHeap::New): If the span was decommitted, ask that it be recommitted before returning it.
(WTF::TCMalloc_PageHeap::AllocLarge): Ditto.
(WTF::TCMalloc_PageHeap::Carve): When splitting a span, ensure that the decommitted state propogates to the two new spans.
(WTF::TCMalloc_PageHeap::Delete): When merging a span, ensure that the resulting span is marked as decommitted if any of the
spans being merged were marked as decommitted.
(WTF::TCMalloc_PageHeap::IncrementalScavenge): Mark as decommitted after releasing the span.
(WTF::TCMalloc_Central_FreeList::FetchFromSpans): Add an assertion to catch a decommitted span being returned to the application
without first being recommitted.
(WTF::TCMalloc_Central_FreeList::Populate): Ditto.

• wtf/TCSystemAlloc.cpp: Stub out TCMalloc_SystemCommit.
• 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
+inline void TCMalloc_SystemCommit(void*, size_t) { }
+#endif
+
 #endif /* TCMALLOC_SYSTEM_ALLOC_H__ */