linux-kernel - Re: [tip:sched/core] sched/numa: Rewrite the CONFIG

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Date:	Fri, 25 May 2012 09:31:20 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Tony Luck <tony.luck@...el.com>
Cc:	mingo@...nel.org, torvalds@...ux-foundation.org,
	cmetcalf@...era.com, sivanich@....com, akpm@...ux-foundation.org,
	ralf@...ux-mips.org, greg.pearson@...com, ink@...assic.park.msu.ru,
	tglx@...utronix.de, rth@...ddle.net,
	kamezawa.hiroyu@...fujitsu.com, paulus@...ba.org,
	linux-kernel@...r.kernel.org, hpa@...or.com, anton@...ba.org,
	lethal@...ux-sh.org, davem@...emloft.net, benh@...nel.crashing.org,
	dhowells@...hat.com, mattst88@...il.com, fenghua.yu@...el.com
Subject: Re: [tip:sched/core] sched/numa: Rewrite the CONFIG_NUMA sched
 domain support

On Thu, 2012-05-24 at 14:23 -0700, Tony Luck wrote:
> Changing both the kzalloc_node() calls in sched_init_numa()
> into plain kzalloc() calls seems to fix things. So it looks like we are trying
> to allocate on a node before the node has been fully set up. 

Right,.. and its not too important either, so lets just use regular
allocations.

That said, I can only find the 1 alloc_node() in sched_init_numa()


---
Subject: sched: Don't try allocating memory from offline nodes
From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Date: Fri May 25 09:26:43 CEST 2012

Allocators don't appreciate it when you try and allocate memory from
offline nodes.

Reported-by: Tony Luck <tony.luck@...el.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
 kernel/sched/core.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Index: linux-2.6/kernel/sched/core.c
===================================================================
--- linux-2.6.orig/kernel/sched/core.c
+++ linux-2.6/kernel/sched/core.c
@@ -6449,7 +6449,7 @@ static void sched_init_numa(void)
 			return;
 
 		for (j = 0; j < nr_node_ids; j++) {
-			struct cpumask *mask = kzalloc_node(cpumask_size(), GFP_KERNEL, j);
+			struct cpumask *mask = kzalloc(cpumask_size(), GFP_KERNEL);
 			if (!mask)
 				return;
 


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