* Ido Yariv <[email protected]> wrote:
> Hi Ingo,
>
> On Wed, Aug 22, 2012 at 10:47:02AM +0200, Ingo Molnar wrote:
> >
> > * Ido Yariv <[email protected]> wrote:
> >
> > > vSMP Foundation does not require to serialize CPA by guaranteeing that
> > > the most recent TLB entry will always be used.
> > >
> > > To avoid needless contention on cpa_lock, do not lock/unlock it if it
> > > isn't necessary.
> > >
> > > Based on work by Shai Fultheim <[email protected]>.
> > >
> > > Signed-off-by: Ido Yariv <[email protected]>
> > > Acked-by: Shai Fultheim <[email protected]>
> > > ---
> > > Changes from v1:
> > > - Use a synthetic CPUID bit and a use static_cpu_has() as suggested by
> > > H. Peter Avnin
> > >
> > > arch/x86/include/asm/cpufeature.h | 1 +
> > > arch/x86/kernel/vsmp_64.c | 10 ++++++++++
> > > arch/x86/mm/pageattr.c | 30 +++++++++++++++++++++---------
> > > 3 files changed, 32 insertions(+), 9 deletions(-)
> > >
> > > diff --git a/arch/x86/include/asm/cpufeature.h
> > > b/arch/x86/include/asm/cpufeature.h
> > > index 6b7ee5f..92303a0 100644
> > > --- a/arch/x86/include/asm/cpufeature.h
> > > +++ b/arch/x86/include/asm/cpufeature.h
> > > @@ -97,6 +97,7 @@
> > > #define X86_FEATURE_EXTD_APICID (3*32+26) /* has extended APICID (8
> > > bits) */
> > > #define X86_FEATURE_AMD_DCM (3*32+27) /* multi-node processor */
> > > #define X86_FEATURE_APERFMPERF (3*32+28) /* APERFMPERF */
> > > +#define X86_FEATURE_NO_CPA_LOCK (3*32+29) /* Serializing cpa is not
> > > required */
> >
> > Patch looks mostly good, but could we please use some more
> > hardware-ish name, instead of referring to a kernel lock?
>
> Sure thing. How about X86_FEATURE_TLB_RELIABLE?
Yeah, something like that. Maybe hpa can think of something
better?
Thanks,
Ingo
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