Changeset 55256 in vbox for trunk/src/VBox/Runtime/common/alloc

Timestamp:

Apr 14, 2015 3:46:47 PM (10 years ago)

Author:

vboxsync

Message:

memcache: alloc tuning.

File:

• trunk/src/VBox/Runtime/common/alloc/memcache.cpp (modified) (2 diffs)

trunk/src/VBox/Runtime/common/alloc/memcache.cpp

@@ -350 +350 @@
 DECL_FORCE_INLINE(int32_t) rtMemCacheGrabObj(PRTMEMCACHEPAGE pPage)
 {
-    int32_t cFreeNew = ASMAtomicDecS32(&pPage->cFree);
-    if (cFreeNew < 0)
-    {
+    if (ASMAtomicUoReadS32(&pPage->cFree) > 0)
+    {
+        int32_t cFreeNew = ASMAtomicDecS32(&pPage->cFree);
+        if (cFreeNew >= 0)
+            return cFreeNew;
         ASMAtomicIncS32(&pPage->cFree);
-        return -1;
-    }
-    return cFreeNew;
+    }
+    return -1;
 }
 
@@ -414 +415 @@
      * Grab a free object at the page level.
      */
-    PRTMEMCACHEPAGE pPage = ASMAtomicReadPtrT(&pThis->pPageHint, PRTMEMCACHEPAGE);
+    PRTMEMCACHEPAGE pPage = ASMAtomicUoReadPtrT(&pThis->pPageHint, PRTMEMCACHEPAGE);
     int32_t iObj = pPage ? rtMemCacheGrabObj(pPage) : -1;
     if (iObj < 0)