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Diffstat (limited to 'mm/slub.c')
-rw-r--r--mm/slub.c36
1 files changed, 30 insertions, 6 deletions
diff --git a/mm/slub.c b/mm/slub.c
index f4a6229848fd..ffe13fdf8144 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -29,6 +29,7 @@
#include <linux/math64.h>
#include <linux/fault-inject.h>
#include <linux/stacktrace.h>
+#include <linux/prefetch.h>
#include <trace/events/kmem.h>
@@ -269,6 +270,11 @@ static inline void *get_freepointer(struct kmem_cache *s, void *object)
return *(void **)(object + s->offset);
}
+static void prefetch_freepointer(const struct kmem_cache *s, void *object)
+{
+ prefetch(object + s->offset);
+}
+
static inline void *get_freepointer_safe(struct kmem_cache *s, void *object)
{
void *p;
@@ -1560,6 +1566,7 @@ static void *get_partial_node(struct kmem_cache *s,
} else {
page->freelist = t;
available = put_cpu_partial(s, page, 0);
+ stat(s, CPU_PARTIAL_NODE);
}
if (kmem_cache_debug(s) || available > s->cpu_partial / 2)
break;
@@ -1983,6 +1990,7 @@ int put_cpu_partial(struct kmem_cache *s, struct page *page, int drain)
local_irq_restore(flags);
pobjects = 0;
pages = 0;
+ stat(s, CPU_PARTIAL_DRAIN);
}
}
@@ -1994,7 +2002,6 @@ int put_cpu_partial(struct kmem_cache *s, struct page *page, int drain)
page->next = oldpage;
} while (this_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page) != oldpage);
- stat(s, CPU_PARTIAL_FREE);
return pobjects;
}
@@ -2028,9 +2035,17 @@ static void flush_cpu_slab(void *d)
__flush_cpu_slab(s, smp_processor_id());
}
+static bool has_cpu_slab(int cpu, void *info)
+{
+ struct kmem_cache *s = info;
+ struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu);
+
+ return !!(c->page);
+}
+
static void flush_all(struct kmem_cache *s)
{
- on_each_cpu(flush_cpu_slab, s, 1);
+ on_each_cpu_cond(has_cpu_slab, flush_cpu_slab, s, 1, GFP_ATOMIC);
}
/*
@@ -2319,6 +2334,8 @@ redo:
object = __slab_alloc(s, gfpflags, node, addr, c);
else {
+ void *next_object = get_freepointer_safe(s, object);
+
/*
* The cmpxchg will only match if there was no additional
* operation and if we are on the right processor.
@@ -2334,11 +2351,12 @@ redo:
if (unlikely(!this_cpu_cmpxchg_double(
s->cpu_slab->freelist, s->cpu_slab->tid,
object, tid,
- get_freepointer_safe(s, object), next_tid(tid)))) {
+ next_object, next_tid(tid)))) {
note_cmpxchg_failure("slab_alloc", s, tid);
goto redo;
}
+ prefetch_freepointer(s, next_object);
stat(s, ALLOC_FASTPATH);
}
@@ -2475,9 +2493,10 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
* If we just froze the page then put it onto the
* per cpu partial list.
*/
- if (new.frozen && !was_frozen)
+ if (new.frozen && !was_frozen) {
put_cpu_partial(s, page, 1);
-
+ stat(s, CPU_PARTIAL_FREE);
+ }
/*
* The list lock was not taken therefore no list
* activity can be necessary.
@@ -3939,13 +3958,14 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size,
if (kmem_cache_open(s, n,
size, align, flags, ctor)) {
list_add(&s->list, &slab_caches);
+ up_write(&slub_lock);
if (sysfs_slab_add(s)) {
+ down_write(&slub_lock);
list_del(&s->list);
kfree(n);
kfree(s);
goto err;
}
- up_write(&slub_lock);
return s;
}
kfree(n);
@@ -5069,6 +5089,8 @@ STAT_ATTR(CMPXCHG_DOUBLE_CPU_FAIL, cmpxchg_double_cpu_fail);
STAT_ATTR(CMPXCHG_DOUBLE_FAIL, cmpxchg_double_fail);
STAT_ATTR(CPU_PARTIAL_ALLOC, cpu_partial_alloc);
STAT_ATTR(CPU_PARTIAL_FREE, cpu_partial_free);
+STAT_ATTR(CPU_PARTIAL_NODE, cpu_partial_node);
+STAT_ATTR(CPU_PARTIAL_DRAIN, cpu_partial_drain);
#endif
static struct attribute *slab_attrs[] = {
@@ -5134,6 +5156,8 @@ static struct attribute *slab_attrs[] = {
&cmpxchg_double_cpu_fail_attr.attr,
&cpu_partial_alloc_attr.attr,
&cpu_partial_free_attr.attr,
+ &cpu_partial_node_attr.attr,
+ &cpu_partial_drain_attr.attr,
#endif
#ifdef CONFIG_FAILSLAB
&failslab_attr.attr,