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From: "Rafael J. Wysocki" <rafael@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>, x86 <x86@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Len Brown <len.brown@intel.com>,
	Linux PM <linux-pm@vger.kernel.org>,
	Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
	Laura Abbott <labbott@fedoraproject.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@kernel.org>,
	Simon Schricker <sschricker@suse.de>,
	Borislav Petkov <bp@suse.de>, Hannes Reinecke <hare@suse.de>
Subject: Re: [PATCH] PM / arch: x86: Rework the MSR_IA32_ENERGY_PERF_BIAS handling
Date: Thu, 21 Mar 2019 10:21:15 +0100	[thread overview]
Message-ID: <CAJZ5v0hz3KFtmsP+8Qbee7KrV4BBOUzReUmK8BWH52+hwekt=Q@mail.gmail.com> (raw)
In-Reply-To: <20190321075807.GK6058@hirez.programming.kicks-ass.net>

On Thu, Mar 21, 2019 at 8:58 AM Peter Zijlstra <peterz@infradead.org> wrote:
>
> On Thu, Mar 21, 2019 at 01:00:52AM +0100, Rafael J. Wysocki wrote:
> > + * The Performance and Energy Bias Hint (EPB) allows software to specify its
> > + * preference with respect to the power-performance tradeoffs present in the
> > + * processor.  Generally, the EPB is expected to be set by user space through
> > + * the generic MSR interface (with the help of the x86_energy_perf_policy tool),
> > + * but there are two reasons for the kernel to touch it.
>
> So I hate /dev/msr with a passion. It is absolute atrocious crap.
>
> Please, just make a real interface for this if it is important.

That's the plan going forward, this is just documenting the current situation.

Do you have any particular concerns regarding this patch?

  parent reply	other threads:[~2019-03-21  9:21 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-21  0:00 [PATCH] PM / arch: x86: Rework the MSR_IA32_ENERGY_PERF_BIAS handling Rafael J. Wysocki
2019-03-21  7:58 ` Peter Zijlstra
2019-03-21  9:20   ` Borislav Petkov
2019-03-21  9:28     ` Rafael J. Wysocki
2019-03-21  9:32       ` Borislav Petkov
2019-03-21  9:36         ` Rafael J. Wysocki
2019-03-21  9:21   ` Rafael J. Wysocki [this message]
2019-04-05 15:32     ` Thomas Gleixner

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