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slab, slub, slob: convert slab_flags_t to 32-bit

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struct kmem_cache::flags is "unsigned long" which is unnecessary on
64-bit as no flags are defined in the higher bits.

Switch the field to 32-bit and save some space on x86_64 until such
flags appear:

	add/remove: 0/0 grow/shrink: 0/107 up/down: 0/-657 (-657)
	function                                     old     new   delta
	sysfs_slab_add                               720     719      -1
				...
	check_object                                 699     676     -23

[akpm@linux-foundation.org: fix printk warning]
Link: http://lkml.kernel.org/r/20171021100635.GA8287@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Pekka Enberg <penberg@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan
2017-11-15 17:32:21 -08:00
committed by Linus Torvalds
parent d50112edde
commit 4fd0b46e89
4 changed files with 28 additions and 28 deletions
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4
mm/slab.c
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@@ -252,8 +252,8 @@ static void kmem_cache_node_init(struct kmem_cache_node *parent)
MAKE_LIST((cachep), (&(ptr)->slabs_free), slabs_free, nodeid); \
} while (0)
#define CFLGS_OBJFREELIST_SLAB ((slab_flags_t __force)0x40000000UL)
#define CFLGS_OFF_SLAB ((slab_flags_t __force)0x80000000UL)
#define CFLGS_OBJFREELIST_SLAB ((slab_flags_t __force)0x40000000U)
#define CFLGS_OFF_SLAB ((slab_flags_t __force)0x80000000U)
#define OBJFREELIST_SLAB(x) ((x)->flags & CFLGS_OBJFREELIST_SLAB)
#define OFF_SLAB(x) ((x)->flags & CFLGS_OFF_SLAB)