From: Mel Gorman <mgorman@suse.de>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Linux-MM <linux-mm@kvack.org>,
Linux-Netdev <netdev@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
David Miller <davem@davemloft.net>, Neil Brown <neilb@suse.de>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Mike Christie <michaelc@cs.wisc.edu>,
Eric B Munson <emunson@mgebm.net>, Mel Gorman <mgorman@suse.de>
Subject: [PATCH 13/16] mm: Micro-optimise slab to avoid a function call
Date: Mon, 16 Apr 2012 13:17:00 +0100 [thread overview]
Message-ID: <1334578624-23257-14-git-send-email-mgorman@suse.de> (raw)
In-Reply-To: <1334578624-23257-1-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 file changed, 26 insertions(+), 2 deletions(-)
diff --git a/mm/slab.c b/mm/slab.c
index 8e660b3..5b2ae1c 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -117,6 +117,8 @@
#include <linux/memory.h>
#include <linux/prefetch.h>
+#include <net/sock.h>
+
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/page.h>
@@ -1012,7 +1014,7 @@ static void check_ac_pfmemalloc(struct kmem_cache *cachep,
pfmemalloc_active = 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;
@@ -1059,7 +1061,20 @@ 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)) {
@@ -1069,6 +1084,15 @@ 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;
}
--
1.7.9.2
--
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next prev parent reply other threads:[~2012-04-16 12:17 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-16 12:16 [PATCH 00/16] Swap-over-NBD without deadlocking V9 Mel Gorman
2012-04-16 12:16 ` [PATCH 01/16] mm: Serialize access to min_free_kbytes Mel Gorman
2012-04-23 23:50 ` David Rientjes
2012-04-16 12:16 ` [PATCH 02/16] mm: sl[au]b: Add knowledge of PFMEMALLOC reserve pages Mel Gorman
2012-04-23 23:51 ` David Rientjes
2012-04-25 15:05 ` Mel Gorman
2012-04-16 12:16 ` [PATCH 03/16] mm: slub: Optimise the SLUB fast path to avoid pfmemalloc checks Mel Gorman
2012-04-16 12:16 ` [PATCH 04/16] mm: Introduce __GFP_MEMALLOC to allow access to emergency reserves Mel Gorman
2012-04-16 12:16 ` [PATCH 05/16] mm: allow PF_MEMALLOC from softirq context Mel Gorman
2012-05-01 22:08 ` Andrew Morton
2012-05-02 16:24 ` Mel Gorman
2012-04-16 12:16 ` [PATCH 06/16] mm: Ignore mempolicies when using ALLOC_NO_WATERMARK Mel Gorman
2012-04-16 12:16 ` [PATCH 07/16] net: Introduce sk_allocation() to allow addition of GFP flags depending on the individual socket Mel Gorman
2012-04-16 12:16 ` [PATCH 08/16] netvm: Allow the use of __GFP_MEMALLOC by specific sockets Mel Gorman
2012-04-16 12:16 ` [PATCH 09/16] netvm: Allow skb allocation to use PFMEMALLOC reserves Mel Gorman
2012-04-16 12:16 ` [PATCH 10/16] netvm: Propagate page->pfmemalloc to skb Mel Gorman
2012-04-16 12:16 ` [PATCH 11/16] netvm: Propagate page->pfmemalloc from netdev_alloc_page " Mel Gorman
2012-04-16 12:16 ` [PATCH 12/16] netvm: Set PF_MEMALLOC as appropriate during SKB processing Mel Gorman
2012-04-16 12:17 ` Mel Gorman [this message]
2012-04-16 12:17 ` [PATCH 14/16] nbd: Set SOCK_MEMALLOC for access to PFMEMALLOC reserves Mel Gorman
2012-04-16 12:17 ` [PATCH 15/16] mm: Throttle direct reclaimers if PF_MEMALLOC reserves are low and swap is backed by network storage Mel Gorman
2012-05-01 22:24 ` Andrew Morton
2012-05-02 16:24 ` Mel Gorman
2012-04-16 12:17 ` [PATCH 16/16] mm: Account for the number of times direct reclaimers get throttled Mel Gorman
2012-04-21 18:15 ` [PATCH 00/16] Swap-over-NBD without deadlocking V9 Eric B Munson
2012-05-01 22:28 ` Andrew Morton
2012-05-03 15:00 ` Mel Gorman
2012-05-03 17:06 ` David Miller
2012-05-04 10:16 ` Mel Gorman
-- strict thread matches above, loose matches on Subject: below --
2012-06-22 14:30 [PATCH 00/17] Swap-over-NBD without deadlocking V13 Mel Gorman
2012-06-22 14:30 ` [PATCH 13/16] mm: Micro-optimise slab to avoid a function call Mel Gorman
2012-06-29 13:32 [PATCH 00/16] Swap-over-NBD without deadlocking V14 Mel Gorman
2012-06-29 13:32 ` [PATCH 13/16] mm: Micro-optimise slab to avoid a function call Mel Gorman
2012-07-12 6:40 [PATCH 00/16] Swap-over-NBD without deadlocking V15 Mel Gorman
2012-07-12 6:40 ` [PATCH 13/16] mm: Micro-optimise slab to avoid a function call Mel Gorman
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