Peter Zijlstra writes:
>
> So I really hate this patch, it makes the code hideous. Also, its a
> death by a thousand cuts adding endless branches in this code.
FWIW compared to the cost of a RDMSR (which is a very complex operation
for the CPU) the cost of a predicted branch is nearly in the noi
On Wed, Jun 18, 2014 at 03:52:55PM +, Liang, Kan wrote:
> diff --git a/arch/x86/kernel/cpu/perf_event.h
> b/arch/x86/kernel/cpu/perf_event.h
> index 3b2f9bd..f828ddd 100644
> --- a/arch/x86/kernel/cpu/perf_event.h
> +++ b/arch/x86/kernel/cpu/perf_event.h
> @@ -555,8 +555,9 @@ static inline voi
On Thu, Jun 19, 2014 at 10:52:52AM -0700, Andi Kleen wrote:
> Andi Kleen writes:
> >>
> >>> Signed-off-by: Kan Liang
> >>
> >> And here I thought that Andi was of the opinion that if you set CPUID to
> >> indicate a particular CPU you had better also handle all its MSRs.
> >
> > Yes, philosop
Andi Kleen writes:
>>
>>> Signed-off-by: Kan Liang
>>
>> And here I thought that Andi was of the opinion that if you set CPUID to
>> indicate a particular CPU you had better also handle all its MSRs.
>
> Yes, philosophically that would be the right way,
> but we needed a short term fix to sto
Peter Zijlstra writes:
>
> This order indicates Andi is the author; but there's no corresponding
> From.
I wrote an early version of the patch, but Kan took it over and extended
it. So both are authors.
BTW Kan you may want to use git send-email to get standard format.
>
>> Signed-off-by: K
On Wed, Jun 18, 2014 at 03:52:55PM +, Liang, Kan wrote:
> perf ignore LBR and offcore_rsp.
>
> x86, perf: Protect LBR and offcore rsp against KVM lying
>
> With -cpu host, KVM reports LBR and offcore support, if the host has
> support.
> When the guest perf driver tries to ac
