From: Peter Zijlstra <peterz@infradead.org>
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Linux PM list <linux-pm@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
Viresh Kumar <viresh.kumar@linaro.org>,
Ingo Molnar <mingo@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Juri Lelli <Juri.Lelli@arm.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steve Muckle <smuckle@linaro.org>,
Doug Smythies <doug.smythies@gmail.com>
Subject: Re: [Resend][PATCH 1/3] cpufreq / sched: SCHED_CPUFREQ_IOWAIT flag to indicate iowait condition
Date: Tue, 13 Sep 2016 09:34:39 +0200 [thread overview]
Message-ID: <20160913073439.GD5008@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <3396916.fdtXW4Ee0Q@vostro.rjw.lan>
On Fri, Sep 09, 2016 at 11:59:33PM +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>
> Testing indicates that it is possible to improve performace
> significantly without increasing energy consumption too much by
> teaching cpufreq governors to bump up the CPU performance level if
> the in_iowait flag is set for the task in enqueue_task_fair().
>
> For this purpose, define a new cpufreq_update_util() flag
> SCHED_CPUFREQ_IOWAIT and modify enqueue_task_fair() to pass that
> flag to cpufreq_update_util() in the in_iowait case. That generally
> requires cpufreq_update_util() to be called directly from there,
> because update_load_avg() may not be invoked in that case.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> Looks-good-to: Steve Muckle <smuckle@linaro.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
next prev parent reply other threads:[~2016-09-13 7:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-09 21:57 [PATCH 0/3] cpufreq / sched: iowait boost in intel_pstate and schedutil Rafael J. Wysocki
2016-09-09 21:59 ` [Resend][PATCH 1/3] cpufreq / sched: SCHED_CPUFREQ_IOWAIT flag to indicate iowait condition Rafael J. Wysocki
2016-09-13 7:34 ` Peter Zijlstra [this message]
2016-09-09 22:00 ` [Resend][PATCH 2/3] cpufreq: schedutil: Add iowait boosting Rafael J. Wysocki
2016-09-13 7:44 ` Peter Zijlstra
2016-09-09 22:02 ` [PATCH 3/3] cpufreq: intel_pstate: Use IOWAIT flag in Atom algorithm Rafael J. Wysocki
2016-09-13 23:59 ` [Update][PATCH " Rafael J. Wysocki
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