From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753897Ab2DPMRZ (ORCPT ); Mon, 16 Apr 2012 08:17:25 -0400 Received: from cantor2.suse.de ([195.135.220.15]:47801 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753794Ab2DPMRU (ORCPT ); Mon, 16 Apr 2012 08:17:20 -0400 From: Mel Gorman To: Andrew Morton Cc: Linux-MM , Linux-Netdev , LKML , David Miller , Neil Brown , Peter Zijlstra , Mike Christie , Eric B Munson , Mel Gorman Subject: [PATCH 13/16] mm: Micro-optimise slab to avoid a function call Date: Mon, 16 Apr 2012 13:17:00 +0100 Message-Id: <1334578624-23257-14-git-send-email-mgorman@suse.de> X-Mailer: git-send-email 1.7.9.2 In-Reply-To: <1334578624-23257-1-git-send-email-mgorman@suse.de> References: <1334578624-23257-1-git-send-email-mgorman@suse.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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 #include +#include + #include #include #include @@ -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