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Date: 17 Mar 2011 03:07:05 -0400
From: "George Spelvin" <linux@...izon.com>
To: linux@...izon.com, penberg@...nel.org
Cc: herbert@...dor.hengli.com.au, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, mpm@...enic.com, penberg@...helsinki.fi,
rientjes@...gle.com
Subject: Re: [PATCH 5/8] mm/slub: Factor out some common code.
> I certainly don't but I'd still like to ask you to change it to
> 'unsigned long'. That's a Linux kernel idiom and we're not going to
> change the whole kernel.
Damn, and I just prepared the following patch. Should I, instead, do
--- a/include/linux/slab_def.h
+++ b/include/linux/slab_def.h
@@ -62,5 +62,5 @@ struct kmem_cache {
/* 3) touched by every alloc & free from the backend */
- unsigned int flags; /* constant flags */
+ unsigned long flags; /* constant flags */
unsigned int num; /* # of objs per slab */
... because the original slab code uses an unsigned int. To fix it
the other way (for SLAB_ flags only) is a patch like this:
>From 217645dfbb1fd42a451ae27aa1ea2c503ff31ef1 Mon Sep 17 00:00:00 2001
From: George Spelvin <linux@...izon.com>
Date: Wed, 16 Mar 2011 22:36:50 -0400
Subject: [PATCH 01/11] mm: Make SLAB_* flags consistently 32-bit unsigned int.
The type of "unsigned long" is silly for a portable flags field, because
you can't portably use more than 32 bits, but it takes 64 bits on 64-bit
processors. And 32-bit manipulations are never slower than 64-bit ones.
Also, include/slab_def.h has always used an "unsigned int" flags field.
This just updates the other implementations to do the same.
(EXCEPTION: SLOB structure must match "struct page".)
Signed-off-by: George Spelvin <linux@...izon.com>
---
include/linux/slab.h | 38 +++++++++++++++++++-------------------
include/linux/slub_def.h | 2 +-
mm/slab.c | 2 +-
mm/slob.c | 5 ++---
mm/slub.c | 22 +++++++++++-----------
5 files changed, 34 insertions(+), 35 deletions(-)
diff --git a/include/linux/slab.h b/include/linux/slab.h
index fa90866..0ff4221 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -16,13 +16,13 @@
* Flags to pass to kmem_cache_create().
* The ones marked DEBUG are only valid if CONFIG_SLAB_DEBUG is set.
*/
-#define SLAB_DEBUG_FREE 0x00000100UL /* DEBUG: Perform (expensive) checks on free */
-#define SLAB_RED_ZONE 0x00000400UL /* DEBUG: Red zone objs in a cache */
-#define SLAB_POISON 0x00000800UL /* DEBUG: Poison objects */
-#define SLAB_HWCACHE_ALIGN 0x00002000UL /* Align objs on cache lines */
-#define SLAB_CACHE_DMA 0x00004000UL /* Use GFP_DMA memory */
-#define SLAB_STORE_USER 0x00010000UL /* DEBUG: Store the last owner for bug hunting */
-#define SLAB_PANIC 0x00040000UL /* Panic if kmem_cache_create() fails */
+#define SLAB_DEBUG_FREE 0x00000100U /* DEBUG: Perform (expensive) checks on free */
+#define SLAB_RED_ZONE 0x00000400U /* DEBUG: Red zone objs in a cache */
+#define SLAB_POISON 0x00000800U /* DEBUG: Poison objects */
+#define SLAB_HWCACHE_ALIGN 0x00002000U /* Align objs on cache lines */
+#define SLAB_CACHE_DMA 0x00004000U /* Use GFP_DMA memory */
+#define SLAB_STORE_USER 0x00010000U /* DEBUG: Store the last owner for bug hunting */
+#define SLAB_PANIC 0x00040000U /* Panic if kmem_cache_create() fails */
/*
* SLAB_DESTROY_BY_RCU - **WARNING** READ THIS!
*
@@ -51,33 +51,33 @@
*
* See also the comment on struct slab_rcu in mm/slab.c.
*/
-#define SLAB_DESTROY_BY_RCU 0x00080000UL /* Defer freeing slabs to RCU */
-#define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */
-#define SLAB_TRACE 0x00200000UL /* Trace allocations and frees */
+#define SLAB_DESTROY_BY_RCU 0x00080000U /* Defer freeing slabs to RCU */
+#define SLAB_MEM_SPREAD 0x00100000U /* Spread some memory over cpuset */
+#define SLAB_TRACE 0x00200000U /* Trace allocations and frees */
/* Flag to prevent checks on free */
#ifdef CONFIG_DEBUG_OBJECTS
-# define SLAB_DEBUG_OBJECTS 0x00400000UL
+# define SLAB_DEBUG_OBJECTS 0x00400000U
#else
-# define SLAB_DEBUG_OBJECTS 0x00000000UL
+# define SLAB_DEBUG_OBJECTS 0x00000000U
#endif
-#define SLAB_NOLEAKTRACE 0x00800000UL /* Avoid kmemleak tracing */
+#define SLAB_NOLEAKTRACE 0x00800000U /* Avoid kmemleak tracing */
/* Don't track use of uninitialized memory */
#ifdef CONFIG_KMEMCHECK
-# define SLAB_NOTRACK 0x01000000UL
+# define SLAB_NOTRACK 0x01000000U
#else
-# define SLAB_NOTRACK 0x00000000UL
+# define SLAB_NOTRACK 0x00000000U
#endif
#ifdef CONFIG_FAILSLAB
-# define SLAB_FAILSLAB 0x02000000UL /* Fault injection mark */
+# define SLAB_FAILSLAB 0x02000000U /* Fault injection mark */
#else
-# define SLAB_FAILSLAB 0x00000000UL
+# define SLAB_FAILSLAB 0x00000000U
#endif
/* The following flags affect the page allocator grouping pages by mobility */
-#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* Objects are reclaimable */
+#define SLAB_RECLAIM_ACCOUNT 0x00020000U /* Objects are reclaimable */
#define SLAB_TEMPORARY SLAB_RECLAIM_ACCOUNT /* Objects are short-lived */
/*
* ZERO_SIZE_PTR will be returned for zero sized kmalloc requests.
@@ -99,7 +99,7 @@ void __init kmem_cache_init(void);
int slab_is_available(void);
struct kmem_cache *kmem_cache_create(const char *, size_t, size_t,
- unsigned long,
+ unsigned int,
void (*)(void *));
void kmem_cache_destroy(struct kmem_cache *);
int kmem_cache_shrink(struct kmem_cache *);
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 8b6e8ae..5ed8408 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -69,7 +69,7 @@ struct kmem_cache_order_objects {
struct kmem_cache {
struct kmem_cache_cpu __percpu *cpu_slab;
/* Used for retriving partial slabs etc */
- unsigned long flags;
+ unsigned int flags;
int size; /* The size of an object including meta data */
int objsize; /* The size of an object without meta data */
int offset; /* Free pointer offset. */
diff --git a/mm/slab.c b/mm/slab.c
index 37961d1..40e71b2 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2164,7 +2164,7 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp)
*/
struct kmem_cache *
kmem_cache_create (const char *name, size_t size, size_t align,
- unsigned long flags, void (*ctor)(void *))
+ unsigned int flags, void (*ctor)(void *))
{
size_t left_over, slab_size, ralign;
struct kmem_cache *cachep = NULL, *pc;
diff --git a/mm/slob.c b/mm/slob.c
index 3588eaa..7745256 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -558,14 +558,13 @@ size_t ksize(const void *block)
EXPORT_SYMBOL(ksize);
struct kmem_cache {
- unsigned int size, align;
- unsigned long flags;
+ unsigned int size, align, flags;
const char *name;
void (*ctor)(void *);
};
struct kmem_cache *kmem_cache_create(const char *name, size_t size,
- size_t align, unsigned long flags, void (*ctor)(void *))
+ size_t align, unsigned int flags, void (*ctor)(void *))
{
struct kmem_cache *c;
diff --git a/mm/slub.c b/mm/slub.c
index e15aa7f..ab36cbe 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1046,8 +1046,8 @@ out:
__setup("slub_debug", setup_slub_debug);
-static unsigned long kmem_cache_flags(unsigned long objsize,
- unsigned long flags, const char *name,
+static unsigned int kmem_cache_flags(unsigned long objsize,
+ unsigned int flags, const char *name,
void (*ctor)(void *))
{
/*
@@ -1074,8 +1074,8 @@ static inline int slab_pad_check(struct kmem_cache *s, struct page *page)
static inline int check_object(struct kmem_cache *s, struct page *page,
void *object, u8 val) { return 1; }
static inline void add_full(struct kmem_cache_node *n, struct page *page) {}
-static inline unsigned long kmem_cache_flags(unsigned long objsize,
- unsigned long flags, const char *name,
+static inline unsigned int kmem_cache_flags(unsigned long objsize,
+ unsigned int flags, const char *name,
void (*ctor)(void *))
{
return flags;
@@ -2069,7 +2069,7 @@ static inline int calculate_order(int size)
/*
* Figure out what the alignment of the objects will be.
*/
-static unsigned long calculate_alignment(unsigned long flags,
+static unsigned long calculate_alignment(unsigned int flags,
unsigned long align, unsigned long size)
{
/*
@@ -2220,7 +2220,7 @@ static void set_min_partial(struct kmem_cache *s, unsigned long min)
*/
static int calculate_sizes(struct kmem_cache *s, int forced_order)
{
- unsigned long flags = s->flags;
+ unsigned int flags = s->flags;
unsigned long size = s->objsize;
unsigned long align = s->align;
int order;
@@ -2340,7 +2340,7 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order)
static int kmem_cache_open(struct kmem_cache *s,
const char *name, size_t size,
- size_t align, unsigned long flags,
+ size_t align, unsigned int flags,
void (*ctor)(void *))
{
memset(s, 0, kmem_size);
@@ -2384,7 +2384,7 @@ static int kmem_cache_open(struct kmem_cache *s,
error:
if (flags & SLAB_PANIC)
panic("Cannot create slab %s size=%lu realsize=%u "
- "order=%u offset=%u flags=%lx\n",
+ "order=%u offset=%u flags=%x\n",
s->name, (unsigned long)size, s->size, oo_order(s->oo),
s->offset, flags);
return 0;
@@ -3160,7 +3160,7 @@ static int slab_unmergeable(struct kmem_cache *s)
}
static struct kmem_cache *find_mergeable(size_t size,
- size_t align, unsigned long flags, const char *name,
+ size_t align, unsigned int flags, const char *name,
void (*ctor)(void *))
{
struct kmem_cache *s;
@@ -3201,7 +3201,7 @@ static struct kmem_cache *find_mergeable(size_t size,
}
struct kmem_cache *kmem_cache_create(const char *name, size_t size,
- size_t align, unsigned long flags, void (*ctor)(void *))
+ size_t align, unsigned int flags, void (*ctor)(void *))
{
struct kmem_cache *s;
char *n;
@@ -3760,7 +3760,7 @@ enum slab_stat_type {
#define SO_TOTAL (1 << SL_TOTAL)
static ssize_t show_slab_objects(struct kmem_cache *s,
- char *buf, unsigned long flags)
+ char *buf, unsigned int flags)
{
unsigned long total = 0;
int node;
--
1.7.4.1
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