linux-kernel - Re: [PATCH 2/2] sched/debug: add sched_update_nr

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Message-ID: <20190904174707.GV2332@hirez.programming.kicks-ass.net>
Date:   Wed, 4 Sep 2019 19:47:07 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Joel Fernandes <joel@...lfernandes.org>,
        Qais Yousef <qais.yousef@....com>,
        Valentin Schneider <valentin.schneider@....com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Jirka Hladký <jhladky@...hat.com>,
        Jiří Vozár <jvozar@...hat.com>,
        X86 ML <x86@...nel.org>
Subject: Re: [PATCH 2/2] sched/debug: add sched_update_nr_running tracepoint

On Wed, Sep 04, 2019 at 08:51:21AM -0700, Alexei Starovoitov wrote:
> Anything in tracing can be deleted.
> Tracing is about debugging and introspection.
> When underlying kernel code changes the introspection points change as well.

Right; except when it breaks widely used tools; like say powertop. Been
there, done that.