linux-kernel - [tip:sched/core] x86/numa: Hard partition cpu topology masks on node boundaries

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Date:	Wed, 9 May 2012 05:59:00 -0700
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	yinghai@...nel.org, a.p.zijlstra@...llo.nl, tj@...nel.org,
	tglx@...utronix.de
Subject: [tip:sched/core] x86/numa:
  Hard partition cpu topology masks on node boundaries

Commit-ID:  0acbb440f06302058e1515861dd534594521e892
Gitweb:     http://git.kernel.org/tip/0acbb440f06302058e1515861dd534594521e892
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Wed, 18 Apr 2012 19:04:09 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 9 May 2012 13:28:59 +0200

x86/numa: Hard partition cpu topology masks on node boundaries

When using numa=fake= you can get weird topologies where LLCs can span
nodes and other such nonsense. Cure this by hard partitioning these
masks on node boundaries.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Tejun Heo <tj@...nel.org>
Cc: Yinghai Lu <yinghai@...nel.org>
Cc: x86@...nel.org
Link: http://lkml.kernel.org/n/tip-di5vwjm96q5vrb76opwuflwx@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/smpboot.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 6e1e406..edfd03a 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -337,6 +337,11 @@ void __cpuinit set_cpu_sibling_map(int cpu)
 		for_each_cpu(i, cpu_sibling_setup_mask) {
 			struct cpuinfo_x86 *o = &cpu_data(i);
 
+#ifdef CONFIG_NUMA_EMU
+			if (cpu_to_node(cpu) != cpu_to_node(i))
+				continue;
+#endif
+
 			if (cpu_has(c, X86_FEATURE_TOPOEXT)) {
 				if (c->phys_proc_id == o->phys_proc_id &&
 				    per_cpu(cpu_llc_id, cpu) == per_cpu(cpu_llc_id, i) &&
@@ -360,11 +365,17 @@ void __cpuinit set_cpu_sibling_map(int cpu)
 	}
 
 	for_each_cpu(i, cpu_sibling_setup_mask) {
+#ifdef CONFIG_NUMA_EMU
+		if (cpu_to_node(cpu) != cpu_to_node(i))
+			continue;
+#endif
+
 		if (per_cpu(cpu_llc_id, cpu) != BAD_APICID &&
 		    per_cpu(cpu_llc_id, cpu) == per_cpu(cpu_llc_id, i)) {
 			cpumask_set_cpu(i, cpu_llc_shared_mask(cpu));
 			cpumask_set_cpu(cpu, cpu_llc_shared_mask(i));
 		}
+
 		if (c->phys_proc_id == cpu_data(i).phys_proc_id) {
 			cpumask_set_cpu(i, cpu_core_mask(cpu));
 			cpumask_set_cpu(cpu, cpu_core_mask(i));
--
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