From: Peter Zijlstra <peterz@infradead.org>
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: 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 08:58:07 +0100 [thread overview]
Message-ID: <20190321075807.GK6058@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <2816566.rddYshD6lm@aspire.rjw.lan>
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.
next prev parent reply other threads:[~2019-03-21 7:58 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-21 0:00 Rafael J. Wysocki
2019-03-21 7:58 ` Peter Zijlstra [this message]
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
2019-04-05 15:32 ` Thomas Gleixner
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