From: Mel Gorman <mgorman@suse.de>
To: Linux-MM <linux-mm@kvack.org>, Linux-Netdev <netdev@vger.kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Mel Gorman <mgorman@suse.de>
Subject: [PATCH 10/12] mm: Micro-optimise slab to avoid a function call
Date: Thu, 14 Apr 2011 11:41:36 +0100 [thread overview]
Message-ID: <1302777698-28237-11-git-send-email-mgorman@suse.de> (raw)
In-Reply-To: <1302777698-28237-1-git-send-email-mgorman@suse.de>
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 <mgorman@suse.de>
---
mm/slab.c | 28 ++++++++++++++++++++++++++--
1 files changed, 26 insertions(+), 2 deletions(-)
diff --git a/mm/slab.c b/mm/slab.c
index 8f81d17..0e9980b 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -116,6 +116,8 @@
#include <linux/kmemcheck.h>
#include <linux/memory.h>
+#include <net/sock.h>
+
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/page.h>
@@ -941,7 +943,7 @@ static void check_ac_pfmemalloc(struct kmem_cache *cachep,
ac->pfmemalloc = false;
}
-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;
@@ -988,7 +990,20 @@ 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)
{
struct slab *slabp;
@@ -1001,6 +1016,15 @@ 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;
}
--
1.7.3.4
--
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next prev parent reply other threads:[~2011-04-14 10:41 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-14 10:41 [PATCH 00/12] Swap-over-NBD without deadlocking v1 Mel Gorman
2011-04-14 10:41 ` [PATCH 01/12] mm: Serialize access to min_free_kbytes Mel Gorman
2011-04-14 10:41 ` [PATCH 02/12] mm: sl[au]b: Add knowledge of PFMEMALLOC reserve pages Mel Gorman
2011-04-14 10:41 ` [PATCH 03/12] mm: Introduce __GFP_MEMALLOC to allow access to emergency reserves Mel Gorman
2011-04-14 10:41 ` [PATCH 04/12] mm: allow PF_MEMALLOC from softirq context Mel Gorman
2011-04-14 10:41 ` [PATCH 05/12] mm: Ignore mempolicies when using ALLOC_NO_WATERMARK Mel Gorman
2011-04-14 10:41 ` [PATCH 06/12] net: Introduce sk_allocation() to allow addition of GFP flags depending on the individual socket Mel Gorman
2011-04-14 10:41 ` [PATCH 07/12] netvm: Allow the use of __GFP_MEMALLOC by specific sockets Mel Gorman
2011-04-14 10:41 ` [PATCH 08/12] netvm: Allow skb allocation to use PFMEMALLOC reserves Mel Gorman
2011-04-14 21:33 ` David Miller
2011-04-15 10:44 ` Mel Gorman
2011-04-14 10:41 ` [PATCH 09/12] netvm: Set PF_MEMALLOC as appropriate during SKB processing Mel Gorman
2011-04-14 10:41 ` Mel Gorman [this message]
2011-04-14 10:41 ` [PATCH 11/12] nbd: Set SOCK_MEMALLOC for access to PFMEMALLOC reserves Mel Gorman
2011-04-14 10:41 ` [PATCH 12/12] mm: Throttle direct reclaimers if PF_MEMALLOC reserves are low and swap is backed by network storage Mel Gorman
2011-04-18 12:30 ` NeilBrown
2011-04-18 14:04 ` Mel Gorman
2011-04-18 12:32 ` NeilBrown
2011-04-18 14:08 ` Mel Gorman
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