linux-kernel - Re: [PATCH] kprobes: Fix to delay the kprobes jump optimization

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Message-ID: <20210219141429.53def012@gandalf.local.home>
Date:   Fri, 19 Feb 2021 14:14:29 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     Uladzislau Rezki <urezki@...il.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>, RCU <rcu@...r.kernel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Daniel Axtens <dja@...ens.net>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <neeraju@...eaurora.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Michal Hocko <mhocko@...e.com>,
        "Theodore Y . Ts'o" <tytso@....edu>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>
Subject: Re: [PATCH] kprobes: Fix to delay the kprobes jump optimization

On Fri, 19 Feb 2021 10:18:11 -0800
"Paul E. McKenney" <paulmck@...nel.org> wrote:

> We can further prevent entry into dyntick-idle state until
> the ksoftirqd kthreads have been spawned, which means that if softirq
> handlers must be deferred, they will be resumed within one jiffy by the
> next scheduler-clock interrupt.

Why not just prevent entry into dyntick-idle state until the system is
finished booting? As you said; There should be no latency-sensitive
applications running, until after we started the system.

-- Steve