linux-kernel - Re: [RFC PATCH v2] ftrace: support very early function tracing

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Message-ID: <20171108081058.GT3165@worktop.lehotels.local>
Date:   Wed, 8 Nov 2017 09:10:58 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Abderrahmane Benbachir <abderrahmane.benbachir@...ymtl.ca>,
        linux-kernel@...r.kernel.org, mingo@...hat.com,
        mathieu.desnoyers@...icios.com,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC PATCH v2] ftrace: support very early function tracing

On Tue, Nov 07, 2017 at 09:17:06PM -0500, Steven Rostedt wrote:
> > +#ifdef CONFIG_X86_TSC
> > +	entry->clock = rdtsc();
> > +#else
> > +	entry->clock = trace_clock_local();
> > +#endif

> > +#ifdef CONFIG_X86_TSC
> > +	cpu_khz = native_calibrate_cpu();
> > +#endif

> > +#ifdef CONFIG_X86_TSC
> > +		ns = cycles_to_ns(entry->clock, cpu_khz);
> > +#else
> > +		ns = entry->clock;
> > +#endif

Yeah, no, not going to happen...