Commit-ID: 0acbb440f06302058e1515861dd534594521e892 Gitweb: http://git.kernel.org/tip/0acbb440f06302058e1515861dd534594521e892 Author: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> AuthorDate: Wed, 18 Apr 2012 19:04:09 +0200 Committer: Ingo Molnar <mingo@xxxxxxxxxx> 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@xxxxxxxxx> Cc: Tejun Heo <tj@xxxxxxxxxx> Cc: Yinghai Lu <yinghai@xxxxxxxxxx> Cc: x86@xxxxxxxxxx Link: http://lkml.kernel.org/n/tip-di5vwjm96q5vrb76opwuflwx@xxxxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- 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)); -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html