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From:   "Kang, Luwei" <luwei.kang@intel.com>
To:     Peter Zijlstra <peterz@infradead.org>,
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Subject: RE: [PATCH v9 04/12] perf/x86/intel/pt: add new capability for
 Intel PT
Thread-Topic: [PATCH v9 04/12] perf/x86/intel/pt: add new capability for
 Intel PT
Thread-Index: AQHT8Xi9oYPMthILhkSzx/04cBEj8qRUYT6AgAAC2oCAAiTusA==
Date:   Fri, 8 Jun 2018 14:37:41 +0000
Message-ID: <82D7661F83C1A047AF7DC287873BF1E167FF0091@SHSMSX101.ccr.corp.intel.com>
References: <1526964735-16566-1-git-send-email-luwei.kang@intel.com>
 <1526964735-16566-5-git-send-email-luwei.kang@intel.com>
 <20180607134051.rwu5pqtz45cgq7ve@um.fi.intel.com>
 <20180607135103.GN12198@hirez.programming.kicks-ass.net>
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> > 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.

A little don't understand. What is "$subject" mean?

Thanks,
Luwei Kang