linux-kernel - Re: plumbers session on profiling?

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Message-ID: <YsQ1VKODuKztM0ad@worktop.programming.kicks-ass.net>
Date:   Tue, 5 Jul 2022 14:57:56 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Bill Wendling <morbo@...gle.com>
Cc:     "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 Mon, Jul 04, 2022 at 04:01:15PM +0200, Peter Zijlstra wrote:
> On Fri, Jul 01, 2022 at 11:57:25AM -0700, Bill Wendling wrote:

> > As for LBR, that will work with Intel/AMD, but I thought that LBR
> > doesn't exist for Arm processors (my knowledge could be out of date on
> > this).
> 
> Not totally up to date on the ARM thing either; but I believe you're
> right in that they don't yet have such a feature.

Just found this in my inbox; I should've seen it before, but it must've
slipped my mind:

  https://lkml.kernel.org/r/20220613100119.684673-1-anshuman.khandual@arm.com

And of course, PowerPC also supports this.