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Date:   Fri, 27 Apr 2018 12:08:58 -0400
From:   Steven Rostedt <>
To:     Mathieu Desnoyers <>
Cc:     "Paul E. McKenney" <>,
        Joel Fernandes <>,
        linux-kernel <>,
        Peter Zijlstra <>,
        Ingo Molnar <>,
        Tom Zanussi <>,
        Namhyung Kim <>,
        Thomas Gleixner <>,
        Boqun Feng <>,
        fweisbec <>,
        Randy Dunlap <>,
        Masami Hiramatsu <>,
        kbuild test robot <>,
        baohong liu <>,
        vedang patel <>,
        kernel-team <>
Subject: Re: [PATCH RFC] tracepoint: Introduce tracepoint callbacks
 executing with preempt on

On Fri, 27 Apr 2018 11:43:41 -0400 (EDT)
Mathieu Desnoyers <> wrote:

> It does so by disabling preemption in the callbacks, even when it's
> redundant with the guarantees already provided by tracepoint-sched-rcu
> and by kprobes. It's not that great for a fast-path.

Really, preempt_disable() is not bad for a fast path. It's far better
than a local_irq_disable().

-- Steve

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