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[PATCH 5/5] kern: make struct kmem_cache fit into two cache lines
From: |
Justus Winter |
Subject: |
[PATCH 5/5] kern: make struct kmem_cache fit into two cache lines |
Date: |
Thu, 2 Jan 2014 20:02:46 +0100 |
Previously, the size of struct kmem_cache was 136 bytes, just eight
bytes larger than 128 bytes, which is typically two cache lines on
today's CPUs.
By reducing the size of the name field which holds a human-readable
description by eight bytes to 24 bytes, the struct kmem_cache can be
made fit into two cache lines. This change should not affect the
usefulness of this field. For reference, the length of the largest
hard-coded name is 17.
* kern/slab.h (KMEM_CACHE_NAME_SIZE): Define to 24.
---
kern/slab.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kern/slab.h b/kern/slab.h
index b842fb7..a4219c4 100644
--- a/kern/slab.h
+++ b/kern/slab.h
@@ -149,7 +149,7 @@ typedef void (*kmem_slab_free_fn_t)(vm_offset_t, vm_size_t);
/*
* Cache name buffer size.
*/
-#define KMEM_CACHE_NAME_SIZE 32
+#define KMEM_CACHE_NAME_SIZE 24
/*
* Cache of objects.
--
1.8.5.2