From 210b5c06130f266370b5ff86e3cb6d860e1be29c Mon Sep 17 00:00:00 2001 From: Cyrill Gorcunov Date: Wed, 22 Oct 2008 23:00:38 +0400 Subject: SLUB: cleanup - define macros instead of hardcoded numbers Signed-off-by: Cyrill Gorcunov Acked-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slub.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index 7ad489af956..7ec2888bffc 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -153,6 +153,10 @@ #define ARCH_SLAB_MINALIGN __alignof__(unsigned long long) #endif +#define OO_SHIFT 16 +#define OO_MASK ((1 << OO_SHIFT) - 1) +#define MAX_OBJS_PER_PAGE 65535 /* since page.objects is u16 */ + /* Internal SLUB flags */ #define __OBJECT_POISON 0x80000000 /* Poison object */ #define __SYSFS_ADD_DEFERRED 0x40000000 /* Not yet visible via sysfs */ @@ -290,7 +294,7 @@ static inline struct kmem_cache_order_objects oo_make(int order, unsigned long size) { struct kmem_cache_order_objects x = { - (order << 16) + (PAGE_SIZE << order) / size + (order << OO_SHIFT) + (PAGE_SIZE << order) / size }; return x; @@ -298,12 +302,12 @@ static inline struct kmem_cache_order_objects oo_make(int order, static inline int oo_order(struct kmem_cache_order_objects x) { - return x.x >> 16; + return x.x >> OO_SHIFT; } static inline int oo_objects(struct kmem_cache_order_objects x) { - return x.x & ((1 << 16) - 1); + return x.x & OO_MASK; } #ifdef CONFIG_SLUB_DEBUG @@ -764,8 +768,8 @@ static int on_freelist(struct kmem_cache *s, struct page *page, void *search) } max_objects = (PAGE_SIZE << compound_order(page)) / s->size; - if (max_objects > 65535) - max_objects = 65535; + if (max_objects > MAX_OBJS_PER_PAGE) + max_objects = MAX_OBJS_PER_PAGE; if (page->objects != max_objects) { slab_err(s, page, "Wrong number of objects. Found %d but " @@ -1807,8 +1811,8 @@ static inline int slab_order(int size, int min_objects, int rem; int min_order = slub_min_order; - if ((PAGE_SIZE << min_order) / size > 65535) - return get_order(size * 65535) - 1; + if ((PAGE_SIZE << min_order) / size > MAX_OBJS_PER_PAGE) + return get_order(size * MAX_OBJS_PER_PAGE) - 1; for (order = max(min_order, fls(min_objects * size - 1) - PAGE_SHIFT); -- cgit v1.2.3 From ce71e27c6fdc43c29f36d307b9100bde70c947fc Mon Sep 17 00:00:00 2001 From: Eduard - Gabriel Munteanu Date: Tue, 19 Aug 2008 20:43:25 +0300 Subject: SLUB: Replace __builtin_return_address(0) with _RET_IP_. This patch replaces __builtin_return_address(0) with _RET_IP_, since a previous patch moved _RET_IP_ and _THIS_IP_ to include/linux/kernel.h and they're widely available now. This makes for shorter and easier to read code. [penberg@cs.helsinki.fi: remove _RET_IP_ casts to void pointer] Signed-off-by: Eduard - Gabriel Munteanu Signed-off-by: Pekka Enberg --- include/linux/slab.h | 8 ++++---- mm/slab.c | 8 ++++---- mm/slub.c | 48 ++++++++++++++++++++++++------------------------ 3 files changed, 32 insertions(+), 32 deletions(-) diff --git a/include/linux/slab.h b/include/linux/slab.h index 000da12b5cf..c97ed28559e 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -253,9 +253,9 @@ static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep, * request comes from. */ #if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB) -extern void *__kmalloc_track_caller(size_t, gfp_t, void*); +extern void *__kmalloc_track_caller(size_t, gfp_t, unsigned long); #define kmalloc_track_caller(size, flags) \ - __kmalloc_track_caller(size, flags, __builtin_return_address(0)) + __kmalloc_track_caller(size, flags, _RET_IP_) #else #define kmalloc_track_caller(size, flags) \ __kmalloc(size, flags) @@ -271,10 +271,10 @@ extern void *__kmalloc_track_caller(size_t, gfp_t, void*); * allocation request comes from. */ #if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB) -extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, void *); +extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, unsigned long); #define kmalloc_node_track_caller(size, flags, node) \ __kmalloc_node_track_caller(size, flags, node, \ - __builtin_return_address(0)) + _RET_IP_) #else #define kmalloc_node_track_caller(size, flags, node) \ __kmalloc_node(size, flags, node) diff --git a/mm/slab.c b/mm/slab.c index 09187517f9d..a1478779901 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -3686,9 +3686,9 @@ void *__kmalloc_node(size_t size, gfp_t flags, int node) EXPORT_SYMBOL(__kmalloc_node); void *__kmalloc_node_track_caller(size_t size, gfp_t flags, - int node, void *caller) + int node, unsigned long caller) { - return __do_kmalloc_node(size, flags, node, caller); + return __do_kmalloc_node(size, flags, node, (void *)caller); } EXPORT_SYMBOL(__kmalloc_node_track_caller); #else @@ -3730,9 +3730,9 @@ void *__kmalloc(size_t size, gfp_t flags) } EXPORT_SYMBOL(__kmalloc); -void *__kmalloc_track_caller(size_t size, gfp_t flags, void *caller) +void *__kmalloc_track_caller(size_t size, gfp_t flags, unsigned long caller) { - return __do_kmalloc(size, flags, caller); + return __do_kmalloc(size, flags, (void *)caller); } EXPORT_SYMBOL(__kmalloc_track_caller); diff --git a/mm/slub.c b/mm/slub.c index 7ec2888bffc..68ab260583d 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -182,7 +182,7 @@ static LIST_HEAD(slab_caches); * Tracking user of a slab. */ struct track { - void *addr; /* Called from address */ + unsigned long addr; /* Called from address */ int cpu; /* Was running on cpu */ int pid; /* Pid context */ unsigned long when; /* When did the operation occur */ @@ -371,7 +371,7 @@ static struct track *get_track(struct kmem_cache *s, void *object, } static void set_track(struct kmem_cache *s, void *object, - enum track_item alloc, void *addr) + enum track_item alloc, unsigned long addr) { struct track *p; @@ -395,8 +395,8 @@ static void init_tracking(struct kmem_cache *s, void *object) if (!(s->flags & SLAB_STORE_USER)) return; - set_track(s, object, TRACK_FREE, NULL); - set_track(s, object, TRACK_ALLOC, NULL); + set_track(s, object, TRACK_FREE, 0UL); + set_track(s, object, TRACK_ALLOC, 0UL); } static void print_track(const char *s, struct track *t) @@ -405,7 +405,7 @@ static void print_track(const char *s, struct track *t) return; printk(KERN_ERR "INFO: %s in %pS age=%lu cpu=%u pid=%d\n", - s, t->addr, jiffies - t->when, t->cpu, t->pid); + s, (void *)t->addr, jiffies - t->when, t->cpu, t->pid); } static void print_tracking(struct kmem_cache *s, void *object) @@ -870,7 +870,7 @@ static void setup_object_debug(struct kmem_cache *s, struct page *page, } static int alloc_debug_processing(struct kmem_cache *s, struct page *page, - void *object, void *addr) + void *object, unsigned long addr) { if (!check_slab(s, page)) goto bad; @@ -910,7 +910,7 @@ bad: } static int free_debug_processing(struct kmem_cache *s, struct page *page, - void *object, void *addr) + void *object, unsigned long addr) { if (!check_slab(s, page)) goto fail; @@ -1033,10 +1033,10 @@ static inline void setup_object_debug(struct kmem_cache *s, struct page *page, void *object) {} static inline int alloc_debug_processing(struct kmem_cache *s, - struct page *page, void *object, void *addr) { return 0; } + struct page *page, void *object, unsigned long addr) { return 0; } static inline int free_debug_processing(struct kmem_cache *s, - struct page *page, void *object, void *addr) { return 0; } + struct page *page, void *object, unsigned long addr) { return 0; } static inline int slab_pad_check(struct kmem_cache *s, struct page *page) { return 1; } @@ -1503,8 +1503,8 @@ static inline int node_match(struct kmem_cache_cpu *c, int node) * we need to allocate a new slab. This is the slowest path since it involves * a call to the page allocator and the setup of a new slab. */ -static void *__slab_alloc(struct kmem_cache *s, - gfp_t gfpflags, int node, void *addr, struct kmem_cache_cpu *c) +static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, + unsigned long addr, struct kmem_cache_cpu *c) { void **object; struct page *new; @@ -1588,7 +1588,7 @@ debug: * Otherwise we can simply pick the next object from the lockless free list. */ static __always_inline void *slab_alloc(struct kmem_cache *s, - gfp_t gfpflags, int node, void *addr) + gfp_t gfpflags, int node, unsigned long addr) { void **object; struct kmem_cache_cpu *c; @@ -1617,14 +1617,14 @@ static __always_inline void *slab_alloc(struct kmem_cache *s, void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags) { - return slab_alloc(s, gfpflags, -1, __builtin_return_address(0)); + return slab_alloc(s, gfpflags, -1, _RET_IP_); } EXPORT_SYMBOL(kmem_cache_alloc); #ifdef CONFIG_NUMA void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node) { - return slab_alloc(s, gfpflags, node, __builtin_return_address(0)); + return slab_alloc(s, gfpflags, node, _RET_IP_); } EXPORT_SYMBOL(kmem_cache_alloc_node); #endif @@ -1638,7 +1638,7 @@ EXPORT_SYMBOL(kmem_cache_alloc_node); * handling required then we can return immediately. */ static void __slab_free(struct kmem_cache *s, struct page *page, - void *x, void *addr, unsigned int offset) + void *x, unsigned long addr, unsigned int offset) { void *prior; void **object = (void *)x; @@ -1708,7 +1708,7 @@ debug: * with all sorts of special processing. */ static __always_inline void slab_free(struct kmem_cache *s, - struct page *page, void *x, void *addr) + struct page *page, void *x, unsigned long addr) { void **object = (void *)x; struct kmem_cache_cpu *c; @@ -1735,7 +1735,7 @@ void kmem_cache_free(struct kmem_cache *s, void *x) page = virt_to_head_page(x); - slab_free(s, page, x, __builtin_return_address(0)); + slab_free(s, page, x, _RET_IP_); } EXPORT_SYMBOL(kmem_cache_free); @@ -2663,7 +2663,7 @@ void *__kmalloc(size_t size, gfp_t flags) if (unlikely(ZERO_OR_NULL_PTR(s))) return s; - return slab_alloc(s, flags, -1, __builtin_return_address(0)); + return slab_alloc(s, flags, -1, _RET_IP_); } EXPORT_SYMBOL(__kmalloc); @@ -2691,7 +2691,7 @@ void *__kmalloc_node(size_t size, gfp_t flags, int node) if (unlikely(ZERO_OR_NULL_PTR(s))) return s; - return slab_alloc(s, flags, node, __builtin_return_address(0)); + return slab_alloc(s, flags, node, _RET_IP_); } EXPORT_SYMBOL(__kmalloc_node); #endif @@ -2748,7 +2748,7 @@ void kfree(const void *x) put_page(page); return; } - slab_free(page->slab, page, object, __builtin_return_address(0)); + slab_free(page->slab, page, object, _RET_IP_); } EXPORT_SYMBOL(kfree); @@ -3204,7 +3204,7 @@ static struct notifier_block __cpuinitdata slab_notifier = { #endif -void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, void *caller) +void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller) { struct kmem_cache *s; @@ -3220,7 +3220,7 @@ void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, void *caller) } void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags, - int node, void *caller) + int node, unsigned long caller) { struct kmem_cache *s; @@ -3431,7 +3431,7 @@ static void resiliency_test(void) {}; struct location { unsigned long count; - void *addr; + unsigned long addr; long long sum_time; long min_time; long max_time; @@ -3479,7 +3479,7 @@ static int add_location(struct loc_track *t, struct kmem_cache *s, { long start, end, pos; struct location *l; - void *caddr; + unsigned long caddr; unsigned long age = jiffies - track->when; start = -1; -- cgit v1.2.3 From e9beef1815ab3aa88925595582cf09e64b2b9894 Mon Sep 17 00:00:00 2001 From: Cyrill Gorcunov Date: Tue, 28 Oct 2008 22:02:26 +0300 Subject: slub - fix get_object_page comment Use 'slab page' instead of 'slab object'. Acked-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slub.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/slub.c b/mm/slub.c index 68ab260583d..8f4edacd082 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1739,7 +1739,7 @@ void kmem_cache_free(struct kmem_cache *s, void *x) } EXPORT_SYMBOL(kmem_cache_free); -/* Figure out on which slab object the object resides */ +/* Figure out on which slab page the object resides */ static struct page *get_object_page(const void *x) { struct page *page = virt_to_head_page(x); -- cgit v1.2.3 From 249b9f331ec162af5a1fdb80f90cce77c2043985 Mon Sep 17 00:00:00 2001 From: roel kluin Date: Wed, 29 Oct 2008 17:18:07 -0400 Subject: slab: unsigned slabp->inuse cannot be less than 0 unsigned slabp->inuse cannot be less than 0 Acked-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slab.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/slab.c b/mm/slab.c index a1478779901..445bcc87b34 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -2997,7 +2997,7 @@ retry: * there must be at least one object available for * allocation. */ - BUG_ON(slabp->inuse < 0 || slabp->inuse >= cachep->num); + BUG_ON(slabp->inuse >= cachep->num); while (slabp->inuse < cachep->num && batchcount--) { STATS_INC_ALLOCED(cachep); -- cgit v1.2.3 From 0094de92a4f1da3a845ccc4ecb12ec0db8e48997 Mon Sep 17 00:00:00 2001 From: David Rientjes Date: Tue, 25 Nov 2008 19:14:19 -0800 Subject: slub: make early_kmem_cache_node_alloc void The return value for early_kmem_cache_node_alloc() is unused, so it is better defined as void. Acked-by: Christoph Lameter Signed-off-by: David Rientjes Signed-off-by: Pekka Enberg --- mm/slub.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index 8f4edacd082..b6968899cb5 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2077,8 +2077,7 @@ static inline int alloc_kmem_cache_cpus(struct kmem_cache *s, gfp_t flags) * when allocating for the kmalloc_node_cache. This is used for bootstrapping * memory on a fresh node that has no slab structures yet. */ -static struct kmem_cache_node *early_kmem_cache_node_alloc(gfp_t gfpflags, - int node) +static void early_kmem_cache_node_alloc(gfp_t gfpflags, int node) { struct page *page; struct kmem_cache_node *n; @@ -2116,7 +2115,6 @@ static struct kmem_cache_node *early_kmem_cache_node_alloc(gfp_t gfpflags, local_irq_save(flags); add_partial(n, page, 0); local_irq_restore(flags); - return n; } static void free_kmem_cache_nodes(struct kmem_cache *s) @@ -2148,8 +2146,7 @@ static int init_kmem_cache_nodes(struct kmem_cache *s, gfp_t gfpflags) n = &s->local_node; else { if (slab_state == DOWN) { - n = early_kmem_cache_node_alloc(gfpflags, - node); + early_kmem_cache_node_alloc(gfpflags, node); continue; } n = kmem_cache_alloc_node(kmalloc_caches, -- cgit v1.2.3 From 249da166582801648432d0198be9407fb5ccf9f5 Mon Sep 17 00:00:00 2001 From: Catalin Marinas Date: Fri, 21 Nov 2008 12:56:22 +0000 Subject: slab: Update the kmem_cache_create documentation regarding the name parameter kmem_cache implementations like slub are allowed to merge multiple caches but only the initial name is preserved. Therefore, kmem_cache_name() is not guaranteed to return the same pointer passed to the former function. This patch updates the documentation to make this clearer. Signed-off-by: Catalin Marinas Signed-off-by: Pekka Enberg --- mm/slab.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/slab.c b/mm/slab.c index 09187517f9d..c366e3910e8 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -2123,6 +2123,8 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep) * * @name must be valid until the cache is destroyed. This implies that * the module calling this has to destroy the cache before getting unloaded. + * Note that kmem_cache_name() is not guaranteed to return the same pointer, + * therefore applications must manage it themselves. * * The flags are * -- cgit v1.2.3 From 9f6c708e5cbf57ee31f6ddaa2cd0262087271b95 Mon Sep 17 00:00:00 2001 From: Nick Andrew Date: Fri, 5 Dec 2008 14:08:08 +1100 Subject: slub: Fix incorrect use of loose It should be 'lose', not 'loose'. Signed-off-by: Nick Andrew Signed-off-by: Pekka Enberg --- mm/slub.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index b6968899cb5..5c8dbe3ae50 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -696,7 +696,7 @@ static int check_object(struct kmem_cache *s, struct page *page, if (!check_valid_pointer(s, page, get_freepointer(s, p))) { object_err(s, page, p, "Freepointer corrupt"); /* - * No choice but to zap it and thus loose the remainder + * No choice but to zap it and thus lose the remainder * of the free objects in this slab. May cause * another error because the object count is now wrong. */ @@ -4344,7 +4344,7 @@ static void sysfs_slab_remove(struct kmem_cache *s) /* * Need to buffer aliases during bootup until sysfs becomes - * available lest we loose that information. + * available lest we lose that information. */ struct saved_alias { struct kmem_cache *s; -- cgit v1.2.3