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Re: [PATCH 2/3] perf/x86/intel: fix for MSR_LAST_BRANCH_FROM_x quirk when no TSX

From Andi Kleen <ak@linux.intel.com>
Newsgroups linux.kernel
Subject Re: [PATCH 2/3] perf/x86/intel: fix for MSR_LAST_BRANCH_FROM_x quirk when no TSX
Date 2016-06-02 18:10 +0200
Message-ID <rFDm2-82K-39@gated-at.bofh.it> (permalink)
References <rFqRP-8y-5@gated-at.bofh.it> <rFqRP-8y-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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>   $ ./lbr_perf record --call-graph lbr -e cycles:k ./cqm_easy
> 
> where lbr_perf is the patched perf tool, that allows to specify :k
> on lbr mode. The above command will trigger a #GPF :

Why would you want to do that? We usually have frame pointers for
the kernel, so callstack LBR for the kernel is pointless.

-Andi

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[PATCH 2/3] perf/x86/intel: fix for MSR_LAST_BRANCH_FROM_x quirk when no TSX David Carrillo-Cisneros <davidcc@google.com> - 2016-06-02 04:50 +0200
  Re: [PATCH 2/3] perf/x86/intel: fix for MSR_LAST_BRANCH_FROM_x quirk  when no TSX Peter Zijlstra <peterz@infradead.org> - 2016-06-02 10:30 +0200
  Re: [PATCH 2/3] perf/x86/intel: fix for MSR_LAST_BRANCH_FROM_x quirk  when no TSX Peter Zijlstra <peterz@infradead.org> - 2016-06-02 10:40 +0200
  Re: [PATCH 2/3] perf/x86/intel: fix for MSR_LAST_BRANCH_FROM_x quirk  when no TSX Peter Zijlstra <peterz@infradead.org> - 2016-06-02 11:00 +0200
  Re: [PATCH 2/3] perf/x86/intel: fix for MSR_LAST_BRANCH_FROM_x quirk  when no TSX Peter Zijlstra <peterz@infradead.org> - 2016-06-02 11:00 +0200
    Re: [PATCH 2/3] perf/x86/intel: fix for MSR_LAST_BRANCH_FROM_x quirk  when no TSX Peter Zijlstra <peterz@infradead.org> - 2016-06-03 11:30 +0200
  Re: [PATCH 2/3] perf/x86/intel: fix for MSR_LAST_BRANCH_FROM_x quirk  when no TSX Peter Zijlstra <peterz@infradead.org> - 2016-06-02 11:00 +0200
  Re: [PATCH 2/3] perf/x86/intel: fix for MSR_LAST_BRANCH_FROM_x quirk  when no TSX Andi Kleen <ak@linux.intel.com> - 2016-06-02 18:10 +0200

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