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

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Message-ID: <CAE9FiQVpVRiipjmBj0qCSRdE2FP3QBdHk0C1BF-NJxPCcy7Dsg@mail.gmail.com>
Date:	Tue, 29 May 2012 10:12:40 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jiang Liu <liuj97@...il.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, mingo@...nel.org,
	torvalds@...ux-foundation.org, cmetcalf@...era.com,
	tony.luck@...el.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,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/core] sched/numa: Rewrite the CONFIG_NUMA sched domain support

On Mon, May 28, 2012 at 5:32 PM, Jiang Liu <liuj97@...il.com> wrote:
> Hi Yinghai,
>        Does this patch fix your issue? https://lkml.org/lkml/2012/5/9/183.
> I have encountered a similar issue on an IA64 platform and the patch above
> works around it. But the root cause is a BIOS bug that the order of CPUs
> in MADT table doesn't conform to the ACPI specification and the first CPU
> in MADT is not the BSP, which breaks some assumption of the booting code
> and causes the core dump.

yes, with another patch from PeterZ.

---
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6396,8 +6396,7 @@ static void sched_init_numa(void)
                       sched_domains_numa_masks[i][j] = mask;

                       for (k = 0; k < nr_node_ids; k++) {
-                               if (node_distance(cpu_to_node(j), k) >
-                                               sched_domains_numa_distance[i])
+                               if (node_distance(j, k) >
sched_domains_numa_distance[i])
                                       continue;

                               cpumask_or(mask, mask, cpumask_of_node(k));
--
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