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[edk2,4/6] MdeModulePkg: carve pool pages into the largest chunks possible

Message ID 1423414278-8455-5-git-send-email-ard.biesheuvel@linaro.org
State New
Headers show

Commit Message

Ard Biesheuvel Feb. 8, 2015, 4:51 p.m. UTC 
In preparation of the next patch, that serves allocations from higher-up
bins if the current bin is depleted, this patch updates the carving up
strategy to populate the largest bins first. To ensure that there will
always be an allocation of the appropriate size made, the current allocation
request is served first from the newly allocated memory region.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 MdeModulePkg/Core/Dxe/Mem/Pool.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)
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Patch

diff --git a/MdeModulePkg/Core/Dxe/Mem/Pool.c b/MdeModulePkg/Core/Dxe/Mem/Pool.c
index 0c5cf3d28451..23409d35c428 100644
--- a/MdeModulePkg/Core/Dxe/Mem/Pool.c
+++ b/MdeModulePkg/Core/Dxe/Mem/Pool.c
@@ -352,9 +352,15 @@  CoreAllocatePoolI (
     }
 
     //
-    // Carve up new page into free pool blocks
+    // Serve the allocation request from the head of the allocated block
     //
-    Offset = 0;
+    Head = (POOL_HEAD *) NewPage;
+    Offset = LIST_TO_SIZE (Index);
+
+    //
+    // Carve up remaining space into free pool blocks
+    //
+    Index = SIZE_TO_LIST (Granularity) - 1;
     while (Offset < Granularity) {
       ASSERT (Index < MAX_POOL_LIST);
       FSize = LIST_TO_SIZE(Index);
@@ -371,7 +377,7 @@  CoreAllocatePoolI (
     }
 
     ASSERT (Offset == Granularity);
-    Index = SIZE_TO_LIST(Size);
+    goto Done;
   }
 
   //