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-rw-r--r--include/linux/slub_def.h2
-rw-r--r--mm/slub.c76
2 files changed, 17 insertions, 61 deletions
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index a78fb4ac2015..0249d4175bac 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -38,8 +38,6 @@ struct kmem_cache_cpu {
void **freelist; /* Pointer to first free per cpu object */
struct page *page; /* The slab from which we are allocating */
int node; /* The node of the page (or -1 for debug) */
- unsigned int offset; /* Freepointer offset (in word units) */
- unsigned int objsize; /* Size of an object (from kmem_cache) */
#ifdef CONFIG_SLUB_STATS
unsigned stat[NR_SLUB_STAT_ITEMS];
#endif
diff --git a/mm/slub.c b/mm/slub.c
index cdb7f0214af0..30d2dde27563 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -260,13 +260,6 @@ static inline int check_valid_pointer(struct kmem_cache *s,
return 1;
}
-/*
- * Slow version of get and set free pointer.
- *
- * This version requires touching the cache lines of kmem_cache which
- * we avoid to do in the fast alloc free paths. There we obtain the offset
- * from the page struct.
- */
static inline void *get_freepointer(struct kmem_cache *s, void *object)
{
return *(void **)(object + s->offset);
@@ -1473,10 +1466,10 @@ static void deactivate_slab(struct kmem_cache *s, struct kmem_cache_cpu *c)
/* Retrieve object from cpu_freelist */
object = c->freelist;
- c->freelist = c->freelist[c->offset];
+ c->freelist = get_freepointer(s, c->freelist);
/* And put onto the regular freelist */
- object[c->offset] = page->freelist;
+ set_freepointer(s, object, page->freelist);
page->freelist = object;
page->inuse--;
}
@@ -1635,7 +1628,7 @@ load_freelist:
if (unlikely(SLABDEBUG && PageSlubDebug(c->page)))
goto debug;
- c->freelist = object[c->offset];
+ c->freelist = get_freepointer(s, object);
c->page->inuse = c->page->objects;
c->page->freelist = NULL;
c->node = page_to_nid(c->page);
@@ -1681,7 +1674,7 @@ debug:
goto another_slab;
c->page->inuse++;
- c->page->freelist = object[c->offset];
+ c->page->freelist = get_freepointer(s, object);
c->node = -1;
goto unlock_out;
}
@@ -1702,7 +1695,6 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,
void **object;
struct kmem_cache_cpu *c;
unsigned long flags;
- unsigned long objsize;
gfpflags &= gfp_allowed_mask;
@@ -1715,22 +1707,21 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,
local_irq_save(flags);
c = __this_cpu_ptr(s->cpu_slab);
object = c->freelist;
- objsize = c->objsize;
if (unlikely(!object || !node_match(c, node)))
object = __slab_alloc(s, gfpflags, node, addr, c);
else {
- c->freelist = object[c->offset];
+ c->freelist = get_freepointer(s, object);
stat(c, ALLOC_FASTPATH);
}
local_irq_restore(flags);
if (unlikely(gfpflags & __GFP_ZERO) && object)
- memset(object, 0, objsize);
+ memset(object, 0, s->objsize);
- kmemcheck_slab_alloc(s, gfpflags, object, c->objsize);
- kmemleak_alloc_recursive(object, objsize, 1, s->flags, gfpflags);
+ kmemcheck_slab_alloc(s, gfpflags, object, s->objsize);
+ kmemleak_alloc_recursive(object, s->objsize, 1, s->flags, gfpflags);
return object;
}
@@ -1785,7 +1776,7 @@ EXPORT_SYMBOL(kmem_cache_alloc_node_notrace);
* handling required then we can return immediately.
*/
static void __slab_free(struct kmem_cache *s, struct page *page,
- void *x, unsigned long addr, unsigned int offset)
+ void *x, unsigned long addr)
{
void *prior;
void **object = (void *)x;
@@ -1799,7 +1790,8 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
goto debug;
checks_ok:
- prior = object[offset] = page->freelist;
+ prior = page->freelist;
+ set_freepointer(s, object, prior);
page->freelist = object;
page->inuse--;
@@ -1864,16 +1856,16 @@ static __always_inline void slab_free(struct kmem_cache *s,
kmemleak_free_recursive(x, s->flags);
local_irq_save(flags);
c = __this_cpu_ptr(s->cpu_slab);
- kmemcheck_slab_free(s, object, c->objsize);
- debug_check_no_locks_freed(object, c->objsize);
+ kmemcheck_slab_free(s, object, s->objsize);
+ debug_check_no_locks_freed(object, s->objsize);
if (!(s->flags & SLAB_DEBUG_OBJECTS))
- debug_check_no_obj_freed(object, c->objsize);
+ debug_check_no_obj_freed(object, s->objsize);
if (likely(page == c->page && c->node >= 0)) {
- object[c->offset] = c->freelist;
+ set_freepointer(s, object, c->freelist);
c->freelist = object;
stat(c, FREE_FASTPATH);
} else
- __slab_free(s, page, x, addr, c->offset);
+ __slab_free(s, page, x, addr);
local_irq_restore(flags);
}
@@ -2060,19 +2052,6 @@ static unsigned long calculate_alignment(unsigned long flags,
return ALIGN(align, sizeof(void *));
}
-static void init_kmem_cache_cpu(struct kmem_cache *s,
- struct kmem_cache_cpu *c)
-{
- c->page = NULL;
- c->freelist = NULL;
- c->node = 0;
- c->offset = s->offset / sizeof(void *);
- c->objsize = s->objsize;
-#ifdef CONFIG_SLUB_STATS
- memset(c->stat, 0, NR_SLUB_STAT_ITEMS * sizeof(unsigned));
-#endif
-}
-
static void
init_kmem_cache_node(struct kmem_cache_node *n, struct kmem_cache *s)
{
@@ -2090,8 +2069,6 @@ static DEFINE_PER_CPU(struct kmem_cache_cpu, kmalloc_percpu[SLUB_PAGE_SHIFT]);
static inline int alloc_kmem_cache_cpus(struct kmem_cache *s, gfp_t flags)
{
- int cpu;
-
if (s < kmalloc_caches + KMALLOC_CACHES && s >= kmalloc_caches)
/*
* Boot time creation of the kmalloc array. Use static per cpu data
@@ -2104,8 +2081,6 @@ static inline int alloc_kmem_cache_cpus(struct kmem_cache *s, gfp_t flags)
if (!s->cpu_slab)
return 0;
- for_each_possible_cpu(cpu)
- init_kmem_cache_cpu(s, per_cpu_ptr(s->cpu_slab, cpu));
return 1;
}
@@ -2391,6 +2366,7 @@ static int kmem_cache_open(struct kmem_cache *s, gfp_t gfpflags,
if (alloc_kmem_cache_cpus(s, gfpflags & ~SLUB_DMA))
return 1;
+
free_kmem_cache_nodes(s);
error:
if (flags & SLAB_PANIC)
@@ -3247,22 +3223,12 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size,
down_write(&slub_lock);
s = find_mergeable(size, align, flags, name, ctor);
if (s) {
- int cpu;
-
s->refcount++;
/*
* Adjust the object sizes so that we clear
* the complete object on kzalloc.
*/
s->objsize = max(s->objsize, (int)size);
-
- /*
- * And then we need to update the object size in the
- * per cpu structures
- */
- for_each_online_cpu(cpu)
- per_cpu_ptr(s->cpu_slab, cpu)->objsize = s->objsize;
-
s->inuse = max_t(int, s->inuse, ALIGN(size, sizeof(void *)));
up_write(&slub_lock);
@@ -3316,14 +3282,6 @@ static int __cpuinit slab_cpuup_callback(struct notifier_block *nfb,
unsigned long flags;
switch (action) {
- case CPU_UP_PREPARE:
- case CPU_UP_PREPARE_FROZEN:
- down_read(&slub_lock);
- list_for_each_entry(s, &slab_caches, list)
- init_kmem_cache_cpu(s, per_cpu_ptr(s->cpu_slab, cpu));
- up_read(&slub_lock);
- break;
-
case CPU_UP_CANCELED:
case CPU_UP_CANCELED_FROZEN:
case CPU_DEAD:
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.