Re: [PATCH v2 2/2] x86: Added read_mostly declaration/definitionto vars from smp.h

[Vlad]

On 05/18/2012 11:14 AM, Ingo Molnar wrote:
> * Vlad Zolotarov<vlad@xxxxxxxxxxx>  wrote:
>
> > Added a "read-mostly" qualifier to the following variables in smp.h:
> >   - cpu_sibling_map
> >   - cpu_core_map
> >   - cpu_llc_shared_map
> >   - cpu_llc_id
> >   - cpu_number
> >   - x86_cpu_to_apicid
> >   - x86_bios_cpu_apicid
> >   - x86_cpu_to_logical_apicid
> >
> > As long as all the variables above are only written during the initialization,
> > this change is meant to prevent the false sharing and improve the
> > performance on large multiprocessor systems.
> >
> > Signed-off-by: Vlad Zolotarov<vlad@xxxxxxxxxxx>
> > Signed-off-by: Shai Fultheim<shai@xxxxxxxxxxx>
> > ---
> >   arch/x86/include/asm/apic.h    |    2 +-
> >   arch/x86/include/asm/smp.h     |   16 ++++++++--------
> >   arch/x86/kernel/apic/apic.c    |    6 +++---
> >   arch/x86/kernel/setup_percpu.c |    2 +-
> >   arch/x86/kernel/smpboot.c      |    8 ++++----
> >   5 files changed, 17 insertions(+), 17 deletions(-)
>
> This does not build on !SMP kernels that has APIC enabled.

Oops... :) My bad. I'll rebase and respin.

Thanks,
vlad

> Thanks,
>
> 	Ingo
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