linux-kernel - Re: [patch V5 03/38] nmi, tracing: Provide nmi_enter/exit

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Message-ID: <20200514213522.59f8de4d@oasis.local.home>
Date:   Thu, 14 May 2020 21:35:22 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Brian Gerst <brgerst@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Will Deacon <will@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Wei Liu <wei.liu@...nel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Jason Chen CJ <jason.cj.chen@...el.com>,
        Zhao Yakui <yakui.zhao@...el.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>
Subject: Re: [patch V5 03/38] nmi, tracing: Provide nmi_enter/exit_notrace()

On Thu, 14 May 2020 21:32:30 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> It's accounting only. Now it does use a per-cpu variable (which I see
> in other patches can be an issue) and calls time_get().

time_get() being defined as trace_clock_local(). And this in only
called if CONFIG_GENERIC_SCHED_CLOCK is not true, as that isn't NMI
safe.

-- Steve