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Date: Tue, 17 Apr 2012 14:16:45 +0300 From: Vlad Zolotarov <vlad@...lemp.com> To: "linux-kernel" <linux-kernel@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com> Cc: "Shai Fultheim (Shai@...leMP.com)" <Shai@...lemp.com>, ido@...ery.com Subject: [PATCH 2/2] x86: Move x86_cpu_to_apicid to the __read_mostly section From: Shai Fultheim <shai@...lemp.com> x86_cpu_to_apicid is only written to during initialization. Benchmarks show that moving it to the __read_mostly section helps avoid false sharing on large multiprocessing systems. Signed-off-by: Shai Fultheim <shai@...lemp.com> Signed-off-by: Vlad Zolotarov <vlad@...lemp.com> --- arch/x86/include/asm/smp.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h index 0434c40..b9d6c1e 100644 --- a/arch/x86/include/asm/smp.h +++ b/arch/x86/include/asm/smp.h @@ -53,7 +53,7 @@ static inline struct cpumask *cpu_llc_shared_mask(int cpu) return per_cpu(cpu_llc_shared_map, cpu); } -DECLARE_EARLY_PER_CPU(u16, x86_cpu_to_apicid); +DECLARE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_cpu_to_apicid); DECLARE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid); #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32) DECLARE_EARLY_PER_CPU(int, x86_cpu_to_logical_apicid); -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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