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Date: Mon, 26 Jan 2015 15:55:28 +0300
From: Vladimir Davydov <vdavydov@...allels.com>
To: Andrew Morton <akpm@...ux-foundation.org>
CC: Christoph Lameter <cl@...ux.com>,
Pekka Enberg <penberg@...nel.org>,
David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Johannes Weiner <hannes@...xchg.org>,
Michal Hocko <mhocko@...e.cz>, <linux-mm@...ck.org>,
<linux-kernel@...r.kernel.org>
Subject: [PATCH -mm 2/3] slab: zap kmem_cache_shrink return value
The kmem_cache_shrink() return value is inconsistent: for SLAB it
returns 0 iff the cache is empty, while for SLUB and SLOB it always
returns 0. So let's zap it.
Signed-off-by: Vladimir Davydov <vdavydov@...allels.com>
---
include/linux/slab.h | 2 +-
mm/slab.c | 9 +++++++--
mm/slab.h | 2 +-
mm/slab_common.c | 8 ++------
mm/slob.c | 3 +--
mm/slub.c | 12 ++++--------
6 files changed, 16 insertions(+), 20 deletions(-)
diff --git a/include/linux/slab.h b/include/linux/slab.h
index ed2ffaab59ea..18430ed916b1 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -116,7 +116,7 @@ struct kmem_cache *kmem_cache_create(const char *, size_t, size_t,
unsigned long,
void (*)(void *));
void kmem_cache_destroy(struct kmem_cache *);
-int kmem_cache_shrink(struct kmem_cache *);
+void kmem_cache_shrink(struct kmem_cache *);
void memcg_create_kmem_cache(struct mem_cgroup *, struct kmem_cache *);
void memcg_deactivate_kmem_caches(struct mem_cgroup *);
diff --git a/mm/slab.c b/mm/slab.c
index 7894017bc160..279c44d6d8e1 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2382,7 +2382,7 @@ out:
return nr_freed;
}
-int __kmem_cache_shrink(struct kmem_cache *cachep)
+static int __cache_shrink(struct kmem_cache *cachep)
{
int ret = 0;
int node;
@@ -2400,11 +2400,16 @@ int __kmem_cache_shrink(struct kmem_cache *cachep)
return (ret ? 1 : 0);
}
+void __kmem_cache_shrink(struct kmem_cache *cachep)
+{
+ __cache_shrink(cachep);
+}
+
int __kmem_cache_shutdown(struct kmem_cache *cachep)
{
int i;
struct kmem_cache_node *n;
- int rc = __kmem_cache_shrink(cachep);
+ int rc = __cache_shrink(cachep);
if (rc)
return rc;
diff --git a/mm/slab.h b/mm/slab.h
index 0a56d76ac0e9..c036e520d2cf 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -138,7 +138,7 @@ static inline unsigned long kmem_cache_flags(unsigned long object_size,
#define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS)
int __kmem_cache_shutdown(struct kmem_cache *);
-int __kmem_cache_shrink(struct kmem_cache *);
+void __kmem_cache_shrink(struct kmem_cache *);
void slab_kmem_cache_release(struct kmem_cache *);
struct seq_file;
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 0dd9eb4e0f87..6803639fdff0 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -641,18 +641,14 @@ EXPORT_SYMBOL(kmem_cache_destroy);
* @cachep: The cache to shrink.
*
* Releases as many slabs as possible for a cache.
- * To help debugging, a zero exit status indicates all slabs were released.
*/
-int kmem_cache_shrink(struct kmem_cache *cachep)
+void kmem_cache_shrink(struct kmem_cache *cachep)
{
- int ret;
-
get_online_cpus();
get_online_mems();
- ret = __kmem_cache_shrink(cachep);
+ __kmem_cache_shrink(cachep);
put_online_mems();
put_online_cpus();
- return ret;
}
EXPORT_SYMBOL(kmem_cache_shrink);
diff --git a/mm/slob.c b/mm/slob.c
index 96a86206a26b..043a14b6ccbe 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -618,9 +618,8 @@ int __kmem_cache_shutdown(struct kmem_cache *c)
return 0;
}
-int __kmem_cache_shrink(struct kmem_cache *d)
+void __kmem_cache_shrink(struct kmem_cache *c)
{
- return 0;
}
struct kmem_cache kmem_cache_boot = {
diff --git a/mm/slub.c b/mm/slub.c
index 770bea3ed445..c09d93dde40e 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3368,7 +3368,7 @@ EXPORT_SYMBOL(kfree);
* being allocated from last increasing the chance that the last objects
* are freed in them.
*/
-int __kmem_cache_shrink(struct kmem_cache *s)
+void __kmem_cache_shrink(struct kmem_cache *s)
{
int node;
int i;
@@ -3430,7 +3430,6 @@ int __kmem_cache_shrink(struct kmem_cache *s)
if (slabs_by_inuse != &empty_slabs)
kfree(slabs_by_inuse);
- return 0;
}
static int slab_mem_going_offline_callback(void *arg)
@@ -4696,12 +4695,9 @@ static ssize_t shrink_show(struct kmem_cache *s, char *buf)
static ssize_t shrink_store(struct kmem_cache *s,
const char *buf, size_t length)
{
- if (buf[0] == '1') {
- int rc = kmem_cache_shrink(s);
-
- if (rc)
- return rc;
- } else
+ if (buf[0] == '1')
+ kmem_cache_shrink(s);
+ else
return -EINVAL;
return length;
}
--
1.7.10.4
--
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