From 3dec16ea38afce38ceb49c8938901318797a08c4 Mon Sep 17 00:00:00 2001 From: Andrzej Hajda Date: Fri, 13 Feb 2015 14:36:38 -0800 Subject: [PATCH] mm/slab: convert cache name allocations to kstrdup_const slab frequently performs duplication of strings located in read-only memory section. Replacing kstrdup by kstrdup_const allows to avoid such operations. [akpm@linux-foundation.org: make the handling of kmem_cache.name const-correct] Signed-off-by: Andrzej Hajda Cc: Marek Szyprowski Cc: Kyungmin Park Cc: Mike Turquette Cc: Alexander Viro Cc: Christoph Lameter Cc: Pekka Enberg Cc: David Rientjes Cc: Joonsoo Kim Cc: Tejun Heo Cc: Greg KH Cc: Geert Uytterhoeven Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/slab_common.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/mm/slab_common.c b/mm/slab_common.c index 1a1cc89acaa3..429a4506b382 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -295,8 +295,8 @@ unsigned long calculate_alignment(unsigned long flags, } static struct kmem_cache * -do_kmem_cache_create(char *name, size_t object_size, size_t size, size_t align, - unsigned long flags, void (*ctor)(void *), +do_kmem_cache_create(const char *name, size_t object_size, size_t size, + size_t align, unsigned long flags, void (*ctor)(void *), struct mem_cgroup *memcg, struct kmem_cache *root_cache) { struct kmem_cache *s; @@ -363,7 +363,7 @@ kmem_cache_create(const char *name, size_t size, size_t align, unsigned long flags, void (*ctor)(void *)) { struct kmem_cache *s; - char *cache_name; + const char *cache_name; int err; get_online_cpus(); @@ -390,7 +390,7 @@ kmem_cache_create(const char *name, size_t size, size_t align, if (s) goto out_unlock; - cache_name = kstrdup(name, GFP_KERNEL); + cache_name = kstrdup_const(name, GFP_KERNEL); if (!cache_name) { err = -ENOMEM; goto out_unlock; @@ -401,7 +401,7 @@ kmem_cache_create(const char *name, size_t size, size_t align, flags, ctor, NULL, NULL); if (IS_ERR(s)) { err = PTR_ERR(s); - kfree(cache_name); + kfree_const(cache_name); } out_unlock: @@ -607,7 +607,7 @@ void memcg_destroy_kmem_caches(struct mem_cgroup *memcg) void slab_kmem_cache_release(struct kmem_cache *s) { destroy_memcg_params(s); - kfree(s->name); + kfree_const(s->name); kmem_cache_free(kmem_cache, s); } -- 2.20.1