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Date:   Mon, 14 Jun 2021 09:51:31 +0200
From:   Peter Zijlstra <>
To:     Bill Wendling <>
Cc:     Kees Cook <>, Jonathan Corbet <>,
        Masahiro Yamada <>,
        Linux Doc Mailing List <>,
        LKML <>,
        Linux Kbuild mailing list <>,
        clang-built-linux <>,
        Andrew Morton <>,
        Nathan Chancellor <>,
        Nick Desaulniers <>,
        Sami Tolvanen <>,
        Fangrui Song <>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <>
Subject: Re: [PATCH v9] pgo: add clang's Profile Guided Optimization

On Sat, Jun 12, 2021 at 01:56:41PM -0700, Bill Wendling wrote:
> For example, Fangrui gave you numbers, and you rejected them out of
> hand. I've explained to you why instrumentation is better than
> sampling (at least for clang). Fangrui gave you numbers. Let's move on
> to something else.

I did not dismiss them; I asked for clarification. I would like to
understand what exactly is missed by sampling based PGO data that makes
such a difference.

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