linux-kernel - [PATCH V2 0/2] perf/x86/intel/pt: Add support for event tracing and TNT disabling

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Date:   Wed, 26 Jan 2022 12:48:13 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        H Peter Anvin <hpa@...or.com>
Subject: [PATCH V2 0/2] perf/x86/intel/pt: Add support for event tracing and TNT disabling

Hi

As of Intel SDM (https://www.intel.com/sdm) version 076, there are 2 new
Intel PT features called Event Trace and TNT-Disable.

Event Trace exposes details about asynchronous events such as interrupts
and VM-Entry/Exit.

TNT-Disable disables TNT packets to reduce the tracing overhead, but with
the result that exact control flow information is lost.

Tools patches are being sent in a separate patch set, but can be found
here:

	https://github.com/ahunter6/linux/tree/event-trace


Changes in V2:

	Add my SOB


Alexander Shishkin (2):
      perf/x86/intel/pt: Add a capability and config bit for event tracing
      perf/x86/intel/pt: Add a capability and config bit for disabling TNTs

 arch/x86/events/intel/pt.c       | 16 ++++++++++++++++
 arch/x86/include/asm/intel_pt.h  |  2 ++
 arch/x86/include/asm/msr-index.h |  2 ++
 3 files changed, 20 insertions(+)


Regards
Adrian