linux-kernel - Re: [PATCH] x86 intel power: Initialize MSR_IA32_ENERGY_PERF

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Date:	Wed, 13 Jul 2011 16:44:26 -0400 (EDT)
From:	Len Brown <lenb@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	x86@...nel.org, linux-pm@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH] x86 intel power: Initialize MSR_IA32_ENERGY_PERF_BIAS


> So how about informing users, how about making it non-silent? An informative 
> printk that also mentions the power configuration tool, etc. This solves the 
> concerns i mentioned.

Something like this?

                rdmsrl(MSR_IA32_ENERGY_PERF_BIAS, epb);
                if ((epb & 0xF) == 0) {
                        printk_once(KERN_WARN, "x86: updated energy_perf_bias"
                                " to 'normal' from 'performance'\n"
                                "You can view and update epb via utility,"
                                " such as x86_energy_perf_policy(8)\n");
                        epb = (epb & ~0xF) | ENERGY_PERF_BIAS_NORMAL;
                        wrmsrl(MSR_IA32_ENERGY_PERF_BIAS, epb);
                }

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