linux-kernel - Re: plumbers session on profiling?

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Message-ID: <YsLzFAoWz1mykLmy@worktop.programming.kicks-ass.net>
Date:   Mon, 4 Jul 2022 16:03:00 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Fangrui Song <maskray@...gle.com>
Cc:     Bill Wendling <morbo@...gle.com>,
        "Jose E. Marchesi" <jemarch@....org>,
        Ruud van der Pas <ruud.vanderpas@...cle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Vladimir Mezentsev <vladimir.mezentsev@...cle.com>,
        clang-built-linux <llvm@...ts.linux.dev>,
        LKML <linux-kernel@...r.kernel.org>, Yonghong Song <yhs@...com>,
        Wenlei He <wenlei@...com>, Hongtao Yu <hoy@...com>,
        Ingo Molnar <mingo@...nel.org>,
        linux-toolchains <linux-toolchains@...r.kernel.org>,
        elena.zannoni@...cle.com
Subject: Re: plumbers session on profiling?

On Fri, Jul 01, 2022 at 12:34:09PM -0700, Fangrui Song wrote:

> Instrumentation based PGO has the nice property that it works with all
> architectures (the compiler supports) and does not rely on hardware
> support. In addition, it collects indirect call targets and string
> operation sizes which are very difficult/impossible for sample based
> PGO.

LBR samples should provide the indirect call targets just fine.