From: Peter Zijlstra <peterz@infradead.org>
To: Vikram Mulukutla <markivx@codeaurora.org>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
Srivatsa Vaddagiri <vatsa@codeaurora.org>,
Steve Muckle <steve.muckle@linaro.org>,
Olav Haugan <ohaugan@codeaurora.org>,
Syed Rameez Mustafa <rameezmustafa@codeaurora.org>,
Joonwoo Park <joonwoop@codeaurora.org>,
Pavankumar Kondeti <pkondeti@codeaurora.org>,
Saravana Kannan <skannan@codeaurora.org>,
Bryan Huntsman <bryanh@codeaurora.org>,
Juri Lelli <juri.lelli@arm.com>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Chris Redpath <chris.redpath@arm.com>,
Robin Randhawa <robin.randhawa@arm.com>,
Patrick Bellasi <patrick.bellasi@arm.com>,
Todd Kjos <tkjos@google.com>,
Srinath Sridharan <srinathsr@google.com>,
Andres Oportus <andresoportus@google.com>,
Leo Yan <leo.yan@linaro.org>,
Vincent Guittot <vincent.guittot@linaro.org>,
Vikram Mulukutla <markivx@codeauorora.org>
Subject: Re: [RFC PATCH 0/3] sched: Introduce Window Assisted Load Tracking
Date: Fri, 28 Oct 2016 09:29:49 +0200 [thread overview]
Message-ID: <20161028072949.GQ3102@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1477638642-17428-1-git-send-email-markivx@codeaurora.org>
On Fri, Oct 28, 2016 at 12:10:39AM -0700, Vikram Mulukutla wrote:
>
> We propose Window-Assisted Load Tracking (WALT) as an alternative or additional
> load tracking scheme in lieu of or along with PELT, one that in our estimation
> better tracks task demand and CPU utilization especially for use cases on
> mobile devices. WALT was conceived by Srivatsa Vaddagiri to provide better
> perf-per-watt numbers on asymmetric CPU (frequency and/or IPC) implementations,
> (specifically on Qualcomm Snapgdragon chipsets running Android) and its metrics
> have been used to guide task placement and p-state selection (load balancing
> in CFS still uses PELT statistics). WALT is now present in the android-common
> kernel as well.
And how come we only learn of it after its already shipping? Isn't that
arse backwards?
next prev parent reply other threads:[~2016-10-28 7:29 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-28 7:10 [RFC PATCH 0/3] sched: Introduce Window Assisted Load Tracking Vikram Mulukutla
2016-10-28 7:10 ` [RFC PATCH 1/3] sched: Introduce structures necessary for WALT Vikram Mulukutla
2016-10-28 7:10 ` [RFC PATCH 2/3] sched: Introduce Window-Assisted CPU utilization Tracking Vikram Mulukutla
2016-10-28 7:38 ` Peter Zijlstra
2016-10-28 7:43 ` Peter Zijlstra
2016-10-28 7:58 ` Vikram Mulukutla
2016-10-28 7:46 ` Peter Zijlstra
2016-10-28 8:03 ` Vikram Mulukutla
2016-10-28 7:52 ` Peter Zijlstra
2016-10-28 7:10 ` [RFC PATCH 3/3] sched: Introduce WALT hooks into core and scheduling classes Vikram Mulukutla
2016-10-28 7:57 ` Peter Zijlstra
2016-10-28 7:29 ` Peter Zijlstra [this message]
2016-10-28 7:55 ` [RFC PATCH 0/3] sched: Introduce Window Assisted Load Tracking Vikram Mulukutla
2016-10-28 9:23 ` Peter Zijlstra
2016-10-28 7:49 ` Peter Zijlstra
2016-10-28 7:57 ` Vikram Mulukutla
2016-10-28 8:49 ` Peter Zijlstra
2016-10-31 15:07 ` Vikram Mulukutla
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