xnu-6153.41.3.tar.gz

[apple/xnu.git] / osfmk / kern / kalloc.c

diff --git a/osfmk/kern/kalloc.c b/osfmk/kern/kalloc.c
index ffe8d7658ae754edfaa683d4330d3d5151a98fd7..26176bc3615cb853ab69bfc51c3801efa25fe2d7 100644 (file)
--- a/osfmk/kern/kalloc.c
+++ b/osfmk/kern/kalloc.c
@@ -192,8 +192,8 @@ KALLOC_ZINFO_SFREE(vm_size_t bytes)
  * 6144       N                    N                   N
  * 8192       Y                    N                   N
  * 12288      N                    X                   X
- * 16384      N                    N                   N
- * 32768      X                    N                   N
+ * 16384      N                    X                   N
+ * 32768      X                    X                   N
  *
  */
 static const struct kalloc_zone_config {
@@ -266,8 +266,15 @@ static const struct kalloc_zone_config {
        KZC_ENTRY(4096, false),
        KZC_ENTRY(6144, false),
        KZC_ENTRY(8192, false),
+       /* To limit internal fragmentation, only add the following zones if the
+        * page size is greater than 4K.
+        * Note that we use ARM_PGBYTES here (instead of one of the VM macros)
+        * since it's guaranteed to be a compile time constant.
+        */
+#if ARM_PGBYTES > 4096
        KZC_ENTRY(16384, false),
        KZC_ENTRY(32768, false),
+#endif /* ARM_PGBYTES > 4096 */
 
 #else
 #error missing or invalid zone size parameters for kalloc