linux-kernel - Re: [PATCH 2/2] tracing: Add support for critical section events

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Message-ID: <20170904193436.4a37fae4@gandalf.local.home>
Date:   Mon, 4 Sep 2017 19:34:36 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Joel Fernandes <joelaf@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>, kernel-team@...roid.com,
        Ingo Molnar <mingo@...hat.com>,
        Byungchul Park <byungchul.park@....com>,
        Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH 2/2] tracing: Add support for critical section events

On Mon, 4 Sep 2017 21:44:26 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> > I can change the name to something else, but at the moment I can't
> > think of anything better. Could you suggest a better name? Also btw,
> > 'critical timings' is the terminology used within the irqsoff tracer
> > so this is in line with that.  
> 
> So 'critical section' is what some mis-guided people call the locked
> region of a lock :-) Using it for something else is prone to cause more
> confusion...
> 
> I would simply call them what they are: irq_disable,irq_enable
> preempt_disable,preempt_enable.

Yes please. The "critical section" naming came from the code that was
from the latency tracer days of the real time patch (pre-ftrace). The
irqsoff tracer has the least modification from the original code, and
probably should be rewritten one of these days.

-- Steve