* Added method VMCache::TransferAreas() moving areas from one cache to

another. The code originates from vm_copy_on_write_area(). We now generate
  the VM cache tracing entries, though.
* count_writable_areas() -> VMCache::CountWritableAreas()
* Added debugger command "cache_stack" which is enabled when VM cache tracing
  is enabled. It prints the source caches of a given cache or area at the
  time of a specified tracing entry.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34751 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/vm/VMCache.h

@@ -101,6 +101,8 @@ public:
 
 			status_t			InsertAreaLocked(VMArea* area);
 			status_t			RemoveArea(VMArea* area);
+			void				TransferAreas(VMCache* fromCache);
+			uint32				CountWritableAreas(VMArea* ignoreArea) const;
 
 			status_t			WriteModified();
 			status_t			SetMinimalCommitment(off_t commitment);
@@ -204,6 +206,7 @@ extern "C" {
 #endif
 
 status_t vm_cache_init(struct kernel_args *args);
+void vm_cache_init_post_heap();
 struct VMCache *vm_cache_acquire_locked_page_cache(struct vm_page *page,
 	bool dontWait);