linux-kernel - [PATCH 0/2] perf/x86/intel/pt: VMX related updates

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Date:   Tue, 14 Feb 2017 15:24:14 +0200
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...hat.com>
Cc:     linux-kernel@...r.kernel.org, vince@...ter.net, eranian@...gle.com,
        Arnaldo Carvalho de Melo <acme@...radead.org>,
        Borislav Petkov <bp@...e.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [PATCH 0/2] perf/x86/intel/pt: VMX related updates

Hi Peter,

On systems where PT does not coexist with VMX operation, we silently stop
scheduling in PT events while VMX is on. It is confusing to the user as
what they get in return is a perf session with no PT trace. So I added a
check for any preexisting VMX users to the event creation path, so that we
can tell the user right off the bat that it's not going to work (2/2). Also,
when we do end up with PT events and VMX coexisting, the scheduling needs to
be aware of it (1/2).

Alexander Shishkin (2):
  perf/x86/intel/pt: Fail event scheduling on conflict with VMX
  perf/x86/intel/pt: Fail event creation if VMX operation is on

 arch/x86/events/intel/pt.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

-- 
2.11.0