Date: Wed, 2 Dec 2015 13:45:31 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>, Chris Metcalf <cmetcalf@ezchip.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Luiz Capitulino <lcapitulino@redhat.com>,
        Christoph Lameter <cl@linux.com>, Ingo Molnar <mingo@kernel.org>,
        Viresh Kumar <viresh.kumar@linaro.org>, Rik van Riel <riel@redhat.com>
Subject: Re: [PATCH 2/7] nohz: New tick dependency mask
Message-ID: <20151202124531.GC9928@worktop.ger.corp.intel.com>
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 <20151201204109.GN17308@twins.programming.kicks-ass.net>
 <20151201222025.GA31973@lerouge>
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On Tue, Dec 01, 2015 at 11:20:28PM +0100, Frederic Weisbecker wrote:

> > > +static void trace_tick_dependency(unsigned long dep)
> > > +{
> > > +	if (dep & TICK_POSIX_TIMER_MASK) {
> > > +		trace_tick_stop(0, "posix timers running\n");
> > > +		return;
> > > +	}
> > > +
> > > +	if (dep & TICK_PERF_EVENTS_MASK) {
> > > +		trace_tick_stop(0, "perf events running\n");
> > > +		return;
> > > +	}
> > > +
> > > +	if (dep & TICK_SCHED_MASK) {
> > > +		trace_tick_stop(0, "more than 1 task in runqueue\n");
> > > +		return;
> > > +	}
> > > +
> > > +	if (dep & TICK_CLOCK_UNSTABLE_MASK)
> > > +		trace_tick_stop(0, "unstable sched clock\n");
> > > +}
> > 
> > I would suggest ditching the strings and using the
> 
> Using a code value instead?

Duh, it seems I forgot to finish that sentence :/

I meant to say use the ftrace enum stuff. So yes, you encode a value and
the ftrace printing muck will generate a string if and when required.
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