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    SubjectRe: [PATCH V6 08/17] perf tools: Add Intel PT support
    Em Thu, Jun 25, 2015 at 08:56:34PM -0300, Arnaldo Carvalho de Melo escreveu:
    > Will do the same tests with intel_pt as well, on a remote machine, add examples
    > to the changeset logs and everything going well, aim for pushing for Ingo soon,

    So, I asked for callchains, with:

    perf record -g -e intel_bts// ls

    And it got stuck somewhere, then I did a perf top to see where it was,
    and got to:

    96.24% perf [.] intel_bts_process_queue

    Annotating I get to:

    1.17 │1a0:┌─→mov 0x8(%r13),%rdx
    │ │ test %rdx,%rdx
    98.83 │ └──je 1a0


    Which is an endless loop! Source code for intel_bts_process_buffer(),
    inlined there:

    while (sz > sizeof(struct branch)) {
    if (!branch->from && !branch->to)
    continue;
    err = intel_bts_synth_branch_sample(btsq, branch);
    if (err)
    break;
    branch += 1;
    sz -= sizeof(struct branch);
    }

    Can you fix this, please, so that I can fold it into where it was
    introduced, namely:

    commit 439ad895a2aecea09416206f023336297cc72efe
    Author: Adrian Hunter <adrian.hunter@intel.com>
    Date: Fri May 29 16:33:39 2015 +0300

    perf tools: Add Intel BTS support

    - Arnaldo


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