Re: [PATCH v9 04/12] perf/x86/intel/pt: add new capability for Intel PT

[Peter Zijlstra]

On Thu, Jun 07, 2018 at 04:40:51PM +0300, Alexander Shishkin wrote:
> On Tue, May 22, 2018 at 12:52:07PM +0800, Luwei Kang wrote:
> > CPUID(EAX=14H,ECX=0):EBX[bit 3] = 1 indicates support of
> > output to Trace Transport subsystem.
> > MSR IA32_RTIT_CTL.FabricEn[bit 6] is reserved if
> > CPUID.(EAX=14H, ECX=0):ECX[bit 3] = 0.
> 
> This should instead say:
> 
> This adds support for "output to Trace Transport subsystem" capability
> of Intel PT, as documented in IA SDM Chapter 36.x.y.z. It means that
> PT can output its trace to an MMIO address range rather than system
> memory buffer.

The $subject also needs attention.