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mm: micro-optimise slab to avoid a function call

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Getting and putting objects in SLAB currently requires a function call but
the bulk of the work is related to PFMEMALLOC reserves which are only
consumed when network-backed storage is critical.  Use an inline function
to determine if the function call is required.

Signed-off-by: Mel Gorman <[email protected]>
Cc: David Miller <[email protected]>
Cc: Neil Brown <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Mike Christie <[email protected]>
Cc: Eric B Munson <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Sebastian Andrzej Siewior <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Christoph Lameter <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mel Gorman 2012-07-31 16:44:30 -07:00 • committed by Linus Torvalds
commit 381760eadc
1 changed files with 26 additions and 2 deletions
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28
mm/slab.c
View file

@ -118,6 +118,8 @@
#include <linux/memory.h>
#include <linux/prefetch.h>
#include <net/sock.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/page.h>
@ -965,7 +967,7 @@ out:
spin_unlock_irqrestore(&l3->list_lock, flags);
}
static void *ac_get_obj(struct kmem_cache *cachep, struct array_cache *ac,
static void *__ac_get_obj(struct kmem_cache *cachep, struct array_cache *ac,
gfp_t flags, bool force_refill)
{
int i;
@ -1012,7 +1014,20 @@ static void *ac_get_obj(struct kmem_cache *cachep, struct array_cache *ac,
return objp;
}
static void ac_put_obj(struct kmem_cache *cachep, struct array_cache *ac,
static inline void *ac_get_obj(struct kmem_cache *cachep,
struct array_cache *ac, gfp_t flags, bool force_refill)
{
void *objp;
if (unlikely(sk_memalloc_socks()))
objp = __ac_get_obj(cachep, ac, flags, force_refill);
else
objp = ac->entry[--ac->avail];
return objp;
}
static void *__ac_put_obj(struct kmem_cache *cachep, struct array_cache *ac,
void *objp)
{
if (unlikely(pfmemalloc_active)) {
@ -1022,6 +1037,15 @@ static void ac_put_obj(struct kmem_cache *cachep, struct array_cache *ac,
set_obj_pfmemalloc(&objp);
}
return objp;
}
static inline void ac_put_obj(struct kmem_cache *cachep, struct array_cache *ac,
void *objp)
{
if (unlikely(sk_memalloc_socks()))
objp = __ac_put_obj(cachep, ac, objp);
ac->entry[ac->avail++] = objp;
}