Changeset 105179 in vbox for trunk/src/VBox/VMM/include

Timestamp:

Jul 8, 2024 10:38:14 AM (7 months ago)

Author:

vboxsync

Message:

VMM/IEM: Introduce a small cache of recently freed TBs for immediate consumption by the allocator to reduce the amount of time required in ASMBitFirstClear()/ASMBitNextClear() to scan for freed TBs when allocating a new TB, bugref:10653

File:

• trunk/src/VBox/VMM/include/IEMInternal.h (modified) (2 diffs)

trunk/src/VBox/VMM/include/IEMInternal.h

@@ -1490 +1490 @@
      *  See iemTbAllocatorFreeupNativeSpace for details. */
     uint32_t        iPruneNativeFrom;
-    uint32_t        uPadding;
+    /** Index into IEMTBALLOCATOR::aFreeCache were the next freed TB can be stored
+     * (0 means the cache is empty, 32 the cache is full). */
+    uint32_t        idxTbCacheFree;
 
     /** Statistics: Number of TB allocation calls. */
@@ -1503 +1505 @@
     /** The delayed free list (see iemTbAlloctorScheduleForFree). */
     PIEMTB          pDelayedFreeHead;
+    /* Cache of recently freed TBs for immediate consumption by the allocator. */
+    PIEMTB          apTbFreeCache[32];
 
     /** Allocation chunks. */