linux-kernel - Re: [GIT PULL] SLAB changes for v3.1-rc0

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Date:	Mon, 25 Jul 2011 08:55:42 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	torvalds@...ux-foundation.org, cl@...ux-foundation.org,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [GIT PULL] SLAB changes for v3.1-rc0

Le vendredi 22 juillet 2011 à 11:08 +0300, Pekka Enberg a écrit :
> Hi Linus,
> 
> Here's batch of slab/slub/slob changes accumulated over the past few months.
> The biggest changes are alignment unification from Christoph Lameter and SLUB
> debugging improvements from Ben Greear. Also notable is SLAB 'struct
> kmem_cache' shrinkage from Eric Dumazet that helps large SMP systems.
> 
> Please note that the SLUB lockless slowpath patches will be sent in a separate
> pull request.
> 
>                          Pekka

Hi Pekka

Could we also merge in 3.1 following "simple enough" patch ?

Thanks

[PATCH] slab: remove one NR_CPUS dependency

Reduce high order allocations in do_tune_cpucache() for some setups.
(NR_CPUS=4096 -> we need 64KB)

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
Acked-by: Christoph Lameter <cl@...ux.com>
CC: Pekka Enberg <penberg@...nel.org>
---
 mm/slab.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/slab.c b/mm/slab.c
index 1e523ed..b80282a 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3934,7 +3934,7 @@ fail:
 
 struct ccupdate_struct {
 	struct kmem_cache *cachep;
-	struct array_cache *new[NR_CPUS];
+	struct array_cache *new[0];
 };
 
 static void do_ccupdate_local(void *info)
@@ -3956,7 +3956,8 @@ static int do_tune_cpucache(struct kmem_cache *cachep, int limit,
 	struct ccupdate_struct *new;
 	int i;
 
-	new = kzalloc(sizeof(*new), gfp);
+	new = kzalloc(sizeof(*new) + nr_cpu_ids * sizeof(struct array_cache *),
+		      gfp);
 	if (!new)
 		return -ENOMEM;
 


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