[llvm-commits] CVS: poolalloc/runtime/FreeListAllocator/PoolAllocator.cpp PoolAllocator.h

[John Criswell]

Changes in directory poolalloc/runtime/FreeListAllocator:

PoolAllocator.cpp updated: 1.20 -> 1.21
PoolAllocator.h updated: 1.7 -> 1.8

---
Log message:

Calculate the maximum number of nodes per page once for each pool instead
of every time we create a slab.
This provides minor performance improvement, I think.



---
Diffs of the changes:  (+7 -6)

Index: poolalloc/runtime/FreeListAllocator/PoolAllocator.cpp
diff -u poolalloc/runtime/FreeListAllocator/PoolAllocator.cpp:1.20 poolalloc/runtime/FreeListAllocator/PoolAllocator.cpp:1.21
--- poolalloc/runtime/FreeListAllocator/PoolAllocator.cpp:1.20	Fri Nov 14 09:35:14 2003
+++ poolalloc/runtime/FreeListAllocator/PoolAllocator.cpp	Fri Nov 14 10:03:39 2003
@@ -39,7 +39,7 @@
 createSlab (PoolTy * Pool, unsigned int NodesPerSlab = 0)
 {
   // Maximum number of nodes per page
-  unsigned int MaxNodesPerPage;
+  unsigned int MaxNodesPerPage = Pool->MaxNodesPerPage;
 
   // Pointer to the new Slab
   struct SlabHeader * NewSlab;
@@ -48,11 +48,6 @@
   unsigned int NodeSize = Pool->NodeSize;
 
   //
-  // Determine how many nodes can exist within a regular slab.
-  //
-  MaxNodesPerPage = (PageSize - sizeof (struct SlabHeader)) / (sizeof (NodePointer) + NodeSize);
-
-  //
   // If we can't fit a node into a page, give up.
   //
   if (NodeSize > PageSize)
@@ -166,6 +161,9 @@
 #if 0
   Pool->FreeablePool = 1;
 #endif /* 0 */
+
+  // Calculate once for this pool the maximum number of nodes per page
+  Pool->MaxNodesPerPage = (PageSize - sizeof (struct SlabHeader)) / (sizeof (NodePointer) + NodeSize);
 
   //
   // Initialize the page manager.


Index: poolalloc/runtime/FreeListAllocator/PoolAllocator.h
diff -u poolalloc/runtime/FreeListAllocator/PoolAllocator.h:1.7 poolalloc/runtime/FreeListAllocator/PoolAllocator.h:1.8
--- poolalloc/runtime/FreeListAllocator/PoolAllocator.h:1.7	Thu Nov 13 18:16:30 2003
+++ poolalloc/runtime/FreeListAllocator/PoolAllocator.h	Fri Nov 14 10:03:39 2003
@@ -26,6 +26,9 @@
   // NodeSize - Keep track of the object size tracked by this pool
   unsigned NodeSize;
 
+  // Maximum number of nodes per page
+  unsigned int MaxNodesPerPage;
+
   // Pointer to the list of slabs allocated for this pool
   struct SlabHeader * Slabs;