What is done there can be done in __kmem_cache_shutdown.
This affects RCU handling somewhat. On rcu free all slab allocators
do not refer to other management structures than the kmem_cache structure.
Therefore these other structures can be freed before the rcu deferred
free to the page allocator occurs.
Reviewed-by: Joonsoo Kim <js1304@xxxxxxxxx>
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
mm/slab.c | 43 +++++++++++++++++++++----------------------
mm/slab.h | 1 -
mm/slab_common.c | 1 -
mm/slob.c | 4 ----
mm/slub.c | 10 +++++-----
5 files changed, 26 insertions(+), 33 deletions(-)
Index: linux-2.6/mm/slob.c
===================================================================
--- linux-2.6.orig/mm/slob.c 2012-08-08 09:54:14.412139056 -0500
+++ linux-2.6/mm/slob.c 2012-08-09 08:52:56.767926051 -0500
@@ -538,10 +538,6 @@ struct kmem_cache *__kmem_cache_create(c
return c;
}
-void __kmem_cache_destroy(struct kmem_cache *c)
-{
-}
-
void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
{
void *b;
Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c 2012-08-08 09:54:14.412139056 -0500
+++ linux-2.6/mm/slub.c 2012-08-09 08:53:26.464693215 -0500
@@ -3198,12 +3198,12 @@ static inline int kmem_cache_close(struc
int __kmem_cache_shutdown(struct kmem_cache *s)
{
- return kmem_cache_close(s);
-}
+ int rc = kmem_cache_close(s);
-void __kmem_cache_destroy(struct kmem_cache *s)
-{
- sysfs_slab_remove(s);
+ if (!rc)
+ sysfs_slab_remove(s);
+
+ return rc;
}
/********************************************************************
Index: linux-2.6/mm/slab.c
===================================================================
--- linux-2.6.orig/mm/slab.c 2012-08-08 09:54:14.412139056 -0500
+++ linux-2.6/mm/slab.c 2012-08-09 08:52:56.759925844 -0500
@@ -2205,26 +2205,6 @@ static void slab_destroy(struct kmem_cac
}
}
-void __kmem_cache_destroy(struct kmem_cache *cachep)
-{
- int i;
- struct kmem_list3 *l3;
-
- for_each_online_cpu(i)
- kfree(cachep->array[i]);
-
- /* NUMA: free the list3 structures */
- for_each_online_node(i) {
- l3 = cachep->nodelists[i];
- if (l3) {
- kfree(l3->shared);
- free_alien_cache(l3->alien);
- kfree(l3);
- }
- }
-}
-
-
/**
* calculate_slab_order - calculate size (page order) of slabs
* @cachep: pointer to the cache that is being created
@@ -2361,9 +2341,6 @@ static int __init_refok setup_cpu_cache(
* Cannot be called within a int, but can be interrupted.
* The @ctor is run when new pages are allocated by the cache.
*
- * @name must be valid until the cache is destroyed. This implies that
- * the module calling this has to destroy the cache before getting unloaded.
- *
* The flags are
*
* %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5)
@@ -2588,7 +2565,7 @@ __kmem_cache_create (const char *name, s
cachep->refcount = 1;
if (setup_cpu_cache(cachep, gfp)) {
- __kmem_cache_destroy(cachep);
+ __kmem_cache_shutdown(cachep);
return NULL;
}
@@ -2763,7 +2740,26 @@ EXPORT_SYMBOL(kmem_cache_shrink);
int __kmem_cache_shutdown(struct kmem_cache *cachep)
{
- return __cache_shrink(cachep);
+ int i;
+ struct kmem_list3 *l3;
+ int rc = __cache_shrink(cachep);
+
+ if (rc)
+ return rc;
+
+ for_each_online_cpu(i)
+ kfree(cachep->array[i]);
+
+ /* NUMA: free the list3 structures */
+ for_each_online_node(i) {
+ l3 = cachep->nodelists[i];
+ if (l3) {
+ kfree(l3->shared);
+ free_alien_cache(l3->alien);
+ kfree(l3);
+ }
+ }
+ return 0;
}
/*
Index: linux-2.6/mm/slab.h
===================================================================
--- linux-2.6.orig/mm/slab.h 2012-08-08 09:54:08.412128035 -0500
+++ linux-2.6/mm/slab.h 2012-08-09 08:53:26.372690845 -0500
@@ -37,6 +37,5 @@ struct kmem_cache *__kmem_cache_create(c
size_t align, unsigned long flags, void (*ctor)(void *));
int __kmem_cache_shutdown(struct kmem_cache *);
-void __kmem_cache_destroy(struct kmem_cache *);
#endif
Index: linux-2.6/mm/slab_common.c
===================================================================
--- linux-2.6.orig/mm/slab_common.c 2012-08-08 09:54:14.412139056 -0500
+++ linux-2.6/mm/slab_common.c 2012-08-09 08:53:26.452692905 -0500
@@ -143,7 +143,6 @@ void kmem_cache_destroy(struct kmem_cach
if (s->flags & SLAB_DESTROY_BY_RCU)
rcu_barrier();
- __kmem_cache_destroy(s);
kmem_cache_free(kmem_cache, s);
} else {
list_add(&s->list, &slab_caches);
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>