linux-kernel - Re: [PATCH 0/5] perf: add support for capturing skid IP

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Message-ID: <20170615231816.GD4789@tassilo.jf.intel.com>
Date:   Thu, 15 Jun 2017 16:18:16 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Stephane Eranian <eranian@...gle.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "mingo@...e.hu" <mingo@...e.hu>,
        "Liang, Kan" <kan.liang@...el.com>, Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH 0/5] perf: add support for capturing skid IP

> Looking at this approach, the user interface is straightforward,
> implementation in the x86 code is a bit more hairy because of the way
> the branch_stack is captured, via the cpuc->lbr_entries. If you assume
> that SKID_IP cannot be used with any other branch stack mode, then it
> is easy. It becomes messy if you don't.

That should be fine. After all if you have real LBRs you don't need
the skid IP.

-Andi