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Message-ID: <20161028074329.GS3102@twins.programming.kicks-ass.net>
Date: Fri, 28 Oct 2016 09:43:29 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Vikram Mulukutla <markivx@...eaurora.org>
Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
Srivatsa Vaddagiri <vatsa@...eaurora.org>,
Steve Muckle <steve.muckle@...aro.org>,
Olav Haugan <ohaugan@...eaurora.org>,
Syed Rameez Mustafa <rameezmustafa@...eaurora.org>,
Joonwoo Park <joonwoop@...eaurora.org>,
Pavankumar Kondeti <pkondeti@...eaurora.org>,
Saravana Kannan <skannan@...eaurora.org>,
Bryan Huntsman <bryanh@...eaurora.org>,
Juri Lelli <juri.lelli@....com>,
Morten Rasmussen <morten.rasmussen@....com>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Chris Redpath <chris.redpath@....com>,
Robin Randhawa <robin.randhawa@....com>,
Patrick Bellasi <patrick.bellasi@....com>,
Todd Kjos <tkjos@...gle.com>,
Srinath Sridharan <srinathsr@...gle.com>,
Andres Oportus <andresoportus@...gle.com>,
Leo Yan <leo.yan@...aro.org>,
Vincent Guittot <vincent.guittot@...aro.org>,
Vikram Mulukutla <markivx@...eauorora.org>
Subject: Re: [RFC PATCH 2/3] sched: Introduce Window-Assisted CPU utilization
Tracking
On Fri, Oct 28, 2016 at 12:10:41AM -0700, Vikram Mulukutla wrote:
> +u64 walt_ktime_clock(void)
> +{
> + if (unlikely(walt_ktime_suspended))
> + return ktime_to_ns(ktime_last);
> + return ktime_get_ns();
> +}
> +static int walt_suspend(void)
> +{
> + ktime_last = ktime_get();
> + walt_ktime_suspended = true;
> + return 0;
> +}
No, ktime_get() will not be used in the scheduler. Imagine the joy if
that thing ends up being the HPET.
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