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

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Message-ID: <20190904131309.GS2332@hirez.programming.kicks-ass.net>
Date:   Wed, 4 Sep 2019 15:13:09 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Radim Krčmář <rkrcmar@...hat.com>
Cc:     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@...nel.org
Subject: Re: [PATCH 2/2] sched/debug: add sched_update_nr_running tracepoint

On Tue, Sep 03, 2019 at 05:43:40PM +0200, Radim Krčmář wrote:

> Red Hat adapted one of them for the tracepoint framework and created a
> tool to plot a heatmap of nr_running, where the sched_update_nr_running
> tracepoint is being used for fine grained monitoring of scheduling
> imbalance.

You should be able to reconstruct this from wakeup and switch
tracepoints.