Changeset 22531 in vbox for trunk/src/VBox/Runtime

Timestamp:

Aug 27, 2009 3:17:53 PM (16 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

51553

Message:

IPRT/r0drv/Linux: fixed comments about allocations

Location:

trunk/src/VBox/Runtime/r0drv/linux

Files:

• alloc-r0drv-linux.c (modified) (1 diff)
• memobj-r0drv-linux.c (modified) (4 diffs)

trunk/src/VBox/Runtime/r0drv/linux/alloc-r0drv-linux.c

@@ -240 +240 @@
     cOrder = CalcPowerOf2Order(cPages);
 #if (defined(RT_ARCH_AMD64) || defined(CONFIG_X86_PAE)) && defined(GFP_DMA32)
+    /* ZONE_DMA32: 0-4GB */
     paPages = alloc_pages(GFP_DMA32, cOrder);
     if (!paPages)
 #endif
 #ifdef RT_ARCH_AMD64
+        /* ZONE_DMA; 0-16MB */
         paPages = alloc_pages(GFP_DMA, cOrder);
 #else
-# if defined(CONFIG_X86_PAE)
-    /** GFP_USER can return page frames above 4GB on PAE systems => GFP_DMA? */
-# endif
+        /* ZONE_NORMAL: 0-896MB */
         paPages = alloc_pages(GFP_USER, cOrder);
 #endif

trunk/src/VBox/Runtime/r0drv/linux/memobj-r0drv-linux.c

@@ -526 +526 @@
     /* Try to avoid GFP_DMA. GFM_DMA32 was introduced with Linux 2.6.15. */
 #if (defined(RT_ARCH_AMD64) || defined(CONFIG_X86_PAE)) && defined(GFP_DMA32)
+    /* ZONE_DMA32: 0-4GB */
     rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_LOW, cb, GFP_DMA32, false /* non-contiguous */);
     if (RT_FAILURE(rc))
 #endif
 #ifdef RT_ARCH_AMD64
+        /* ZONE_DMA: 0-16MB */
         rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_LOW, cb, GFP_DMA, false /* non-contiguous */);
 #else
 # ifdef CONFIG_X86_PAE
-        /** XXX GFP_USER can return page frames above 4GB on PAE systems => GFP_DMA? */
 # endif
+        /* ZONE_NORMAL: 0-896MB */
         rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_LOW, cb, GFP_USER, false /* non-contiguous */);
 #endif
@@ -560 +562 @@
 
 #if (defined(RT_ARCH_AMD64) || defined(CONFIG_X86_PAE)) && defined(GFP_DMA32)
+    /* ZONE_DMA32: 0-4GB */
     rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_CONT, cb, GFP_DMA32, true /* contiguous */);
     if (RT_FAILURE(rc))
 #endif
 #ifdef RT_ARCH_AMD64
+        /* ZONE_DMA: 0-16MB */
         rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_CONT, cb, GFP_DMA, true /* contiguous */);
 #else
-# if defined(CONFIG_X86_PAE)
-        /** XXX GFP_USER can return page frames above 4GB on PAE systems => GFP_DMA? */
-# endif
+        /* ZONE_NORMAL (32-bit hosts): 0-896MB */
         rc = rtR0MemObjLinuxAllocPages(&pMemLnx, RTR0MEMOBJTYPE_CONT, cb, GFP_USER, true /* contiguous */);
 #endif
@@ -666 +668 @@
      */
     if (PhysHighest == NIL_RTHCPHYS)
+        /* ZONE_HIGHMEM: the whole physical memory */
         rc = rtR0MemObjLinuxAllocPhysSub2(ppMem, enmType, cb, PhysHighest, GFP_HIGHUSER);
     else if (PhysHighest <= _1M * 16)
+        /* ZONE_DMA: 0-16MB */
         rc = rtR0MemObjLinuxAllocPhysSub2(ppMem, enmType, cb, PhysHighest, GFP_DMA);
     else
@@ -673 +677 @@
         rc = VERR_NO_MEMORY;
         if (RT_FAILURE(rc))
+            /* ZONE_HIGHMEM: the whole physical memory */
             rc = rtR0MemObjLinuxAllocPhysSub2(ppMem, enmType, cb, PhysHighest, GFP_HIGHUSER);
         if (RT_FAILURE(rc))
+            /* ZONE_NORMAL: 0-896MB */
             rc = rtR0MemObjLinuxAllocPhysSub2(ppMem, enmType, cb, PhysHighest, GFP_USER);
 #ifdef GFP_DMA32
         if (RT_FAILURE(rc))
+            /* ZONE_DMA32: 0-4GB */
             rc = rtR0MemObjLinuxAllocPhysSub2(ppMem, enmType, cb, PhysHighest, GFP_DMA32);
 #endif
         if (RT_FAILURE(rc))
+            /* ZONE_DMA: 0-16MB */
             rc = rtR0MemObjLinuxAllocPhysSub2(ppMem, enmType, cb, PhysHighest, GFP_DMA);
     }