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authorVlastimil Babka <vbabka@suse.cz>2022-11-21 18:58:39 +0300
committerVlastimil Babka <vbabka@suse.cz>2022-12-01 02:09:09 +0300
commitbe784ba861b93c5cd2c0565c5819c290675b50be (patch)
tree39decdee87fe13c1f93fe81f90b4688dfa401249 /mm
parent0af8489b0216fa1dd83e264bef8063f2632633d7 (diff)
downloadlinux-be784ba861b93c5cd2c0565c5819c290675b50be.tar.xz
mm, slub: don't aggressively inline with CONFIG_SLUB_TINY
SLUB fastpaths use __always_inline to avoid function calls. With CONFIG_SLUB_TINY we would rather save the memory. Add a __fastpath_inline macro that's __always_inline normally but empty with CONFIG_SLUB_TINY. bloat-o-meter results on x86_64 mm/slub.o: add/remove: 3/1 grow/shrink: 1/8 up/down: 865/-1784 (-919) Function old new delta kmem_cache_free 20 281 +261 slab_alloc_node.isra - 245 +245 slab_free.constprop.isra - 231 +231 __kmem_cache_alloc_lru.isra - 128 +128 __kmem_cache_release 88 83 -5 __kmem_cache_create 1446 1436 -10 __kmem_cache_free 271 142 -129 kmem_cache_alloc_node 330 127 -203 kmem_cache_free_bulk.part 826 613 -213 __kmem_cache_alloc_node 230 10 -220 kmem_cache_alloc_lru 325 12 -313 kmem_cache_alloc 325 10 -315 kmem_cache_free.part 376 - -376 Total: Before=26103, After=25184, chg -3.52% Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Mike Rapoport <rppt@linux.ibm.com> Reviewed-by: Christoph Lameter <cl@linux.com> Acked-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Diffstat (limited to 'mm')
-rw-r--r--mm/slub.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/mm/slub.c b/mm/slub.c
index 00d921bd5417..ac9e4a15fa32 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -187,6 +187,12 @@ do { \
#define USE_LOCKLESS_FAST_PATH() (false)
#endif
+#ifndef CONFIG_SLUB_TINY
+#define __fastpath_inline __always_inline
+#else
+#define __fastpath_inline
+#endif
+
#ifdef CONFIG_SLUB_DEBUG
#ifdef CONFIG_SLUB_DEBUG_ON
DEFINE_STATIC_KEY_TRUE(slub_debug_enabled);
@@ -3386,7 +3392,7 @@ static __always_inline void maybe_wipe_obj_freeptr(struct kmem_cache *s,
*
* Otherwise we can simply pick the next object from the lockless free list.
*/
-static __always_inline void *slab_alloc_node(struct kmem_cache *s, struct list_lru *lru,
+static __fastpath_inline void *slab_alloc_node(struct kmem_cache *s, struct list_lru *lru,
gfp_t gfpflags, int node, unsigned long addr, size_t orig_size)
{
void *object;
@@ -3412,13 +3418,13 @@ out:
return object;
}
-static __always_inline void *slab_alloc(struct kmem_cache *s, struct list_lru *lru,
+static __fastpath_inline void *slab_alloc(struct kmem_cache *s, struct list_lru *lru,
gfp_t gfpflags, unsigned long addr, size_t orig_size)
{
return slab_alloc_node(s, lru, gfpflags, NUMA_NO_NODE, addr, orig_size);
}
-static __always_inline
+static __fastpath_inline
void *__kmem_cache_alloc_lru(struct kmem_cache *s, struct list_lru *lru,
gfp_t gfpflags)
{
@@ -3733,7 +3739,7 @@ static void do_slab_free(struct kmem_cache *s,
}
#endif /* CONFIG_SLUB_TINY */
-static __always_inline void slab_free(struct kmem_cache *s, struct slab *slab,
+static __fastpath_inline void slab_free(struct kmem_cache *s, struct slab *slab,
void *head, void *tail, void **p, int cnt,
unsigned long addr)
{