linux-kernel - Re: [ANNOUNCE] Tools to analyse PM and scheduling behaviour

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Message-ID: <8761hwcjw6.fsf@matterhorn.verdurent.com>
Date:	Thu, 14 Aug 2014 00:11:13 +0530
From:	Amit Kucheria <amit.kucheria@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	"Gross\, Mark" <mark.gross@...el.com>,
	Paul McKenney <Paul.McKenney@...ibm.com>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	Dietmar Eggemann <Dietmar.Eggemann@....com>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Mike Turquette <mturquette@...aro.org>,
	Juri Lelli <juri.lelli@....com>, sched-tools@...aro.org
Subject: Re: [ANNOUNCE] Tools to analyse PM and scheduling behaviour

Peter Zijlstra <peterz@...radead.org> writes:

> On Fri, Aug 08, 2014 at 07:24:01PM +0530, Amit Kucheria wrote:
>> Workload Generator Details
>> --------------------------
>> The Workload Generator is based on rt-app. Shared resources, waits, signals
>> and locking order can be specified for each thread in a JSON description to
>> construct complex interdependencies. This allows simulation of interesting
>> use-cases. The repository contains examples of a mp3 and web-browsing
>> workload.
>> 
>> The method to construct the JSON description is quite manual currently. We
>> capture the trace of a workload of interest (say, on Android) and analyse
>> it in kernelshark. We then construct the JSON description by hand until its
>> resultant trace looks similar to the trace from the real workload.
>> 
>> The immediate goal is to expand the library to cover the common mobile
>> workloads. We’re also working with the rt-app maintainer to get our changes
>> merged.
>
> With the end goal of having a program convert a trace into a JSON
> description I take it?

Either that or re-evaluate if perf record and playback can actually do
away with the need to do this.
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