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

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Message-ID: <20170615151018.GA4789@tassilo.jf.intel.com>
Date:   Thu, 15 Jun 2017 08:10:18 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Stephane Eranian <eranian@...gle.com>
Cc:     linux-kernel@...r.kernel.org, acme@...hat.com,
        peterz@...radead.org, mingo@...e.hu, kan.liang@...el.com,
        jolsa@...hat.com
Subject: Re: [PATCH 0/5] perf: add support for capturing skid IP

On Thu, Jun 15, 2017 at 06:56:24AM -0700, Stephane Eranian wrote:
> This patchs adds a new sample record type called
> PERF_SAMPLE_SKID_IP. The goal is to record
> the unmodified interrupted instruction pointer (IP) as seen by
> the kernel and reflected in the machine state.

Patches look reasonable for me.

If you only cared about branches it would be more natural to model
it like a 1 entry LBR. That would make a lot more tooling work
automatically.

-Andi