Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg...

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6:
  slub: Do not use 192 byte sized cache if minimum alignment is 128 byte

diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 71e43a12ebbbc62521498155d6bace9b2b0e0585..cef6f8fddd7dae42d667297c197f43cc8fdcc142 100644 (file)
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -137,10 +137,12 @@ static __always_inline int kmalloc_index(size_t size)
        if (size <= KMALLOC_MIN_SIZE)
                return KMALLOC_SHIFT_LOW;
 
+#if KMALLOC_MIN_SIZE <= 64
        if (size > 64 && size <= 96)
                return 1;
        if (size > 128 && size <= 192)
                return 2;
+#endif
        if (size <=          8) return 3;
        if (size <=         16) return 4;
        if (size <=         32) return 5;

diff --git a/mm/slub.c b/mm/slub.c
index 0987d1cd943cc88d626a7d1b1097ba1f83243591..2c9a62d1f429d96f0daf9048e3d6cd23df9cf03c 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2995,8 +2995,6 @@ void __init kmem_cache_init(void)
                create_kmalloc_cache(&kmalloc_caches[1],
                                "kmalloc-96", 96, GFP_KERNEL);
                caches++;
-       }
-       if (KMALLOC_MIN_SIZE <= 128) {
                create_kmalloc_cache(&kmalloc_caches[2],
                                "kmalloc-192", 192, GFP_KERNEL);
                caches++;
@@ -3026,6 +3024,16 @@ void __init kmem_cache_init(void)
        for (i = 8; i < KMALLOC_MIN_SIZE; i += 8)
                size_index[(i - 1) / 8] = KMALLOC_SHIFT_LOW;
 
+       if (KMALLOC_MIN_SIZE == 128) {
+               /*
+                * The 192 byte sized cache is not used if the alignment
+                * is 128 byte. Redirect kmalloc to use the 256 byte cache
+                * instead.
+                */
+               for (i = 128 + 8; i <= 192; i += 8)
+                       size_index[(i - 1) / 8] = 8;
+       }
+
        slab_state = UP;
 
        /* Provide the correct kmalloc names now that the caches are up */