linux-kernel - Re: [RFC 0/3] Revert SRCU from tracepoint infrastructure

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Date:   Mon, 10 Feb 2020 12:05:52 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        "Joel Fernandes, Google" <joel@...lfernandes.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Ingo Molnar <mingo@...hat.com>,
        Richard Fontana <rfontana@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        paulmck <paulmck@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Subject: Re: [RFC 0/3] Revert SRCU from tracepoint infrastructure

On Mon, 10 Feb 2020 10:46:16 +0100
Peter Zijlstra <peterz@...radead.org> wrote:

> Furthermore, using srcu would be detrimental, because of how it has
> smp_mb() in the read side primitives.

I didn't realize that there was a full memory barrier in the srcu read
side. Seems to me that itself is rational for reverting it. And also a
big NAK for any suggestion to have any of the function tracing to use
it as well (which comes up here and there).

-- Steve