Messages in this thread Patch in this message | | | From | Vlad Zolotarov <> | Subject | [PATCH 2/2] x86: Move x86_cpu_to_apicid to the __read_mostly section | Date | Tue, 24 Apr 2012 14:29:53 +0300 |
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From: Shai Fultheim <shai@scalemp.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@scalemp.com> Signed-off-by: Vlad Zolotarov <vlad@scalemp.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
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