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Tue, 17 Nov 2020 02:11:30 -0800 (PST) Date: Tue, 17 Nov 2020 15:41:28 +0530 From: Viresh Kumar To: Lukasz Luba Subject: Re: [PATCH v3 3/3] [RFC] CPUFreq: Add support for cpu-perf-dependencies Message-ID: <20201117101128.6uapqg56arwqmm5p@vireshk-i7> References: <20201102120115.29993-1-nicola.mazzucato@arm.com> <20201102120115.29993-4-nicola.mazzucato@arm.com> <20201106092020.za3oxg7gutzc3y2b@vireshk-i7> <0a334a73-45ef-58ff-7dfd-9df6f4ff290a@arm.com> <20201106105514.bhtdklyhn7goml64@vireshk-i7> <7f73bcd6-0f06-4ef0-7f02-0751e6c4d94b@arm.com> <20201109065742.22czfgyjhsjmkytf@vireshk-i7> <2fa8a5c0-f66d-34bc-7f1c-8462e7532e0a@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <2fa8a5c0-f66d-34bc-7f1c-8462e7532e0a@arm.com> User-Agent: NeoMutt/20180716-391-311a52 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201117_051135_540648_5208D431 X-CRM114-Status: GOOD ( 24.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: nm@ti.com, devicetree@vger.kernel.org, linux-pm@vger.kernel.org, sboyd@kernel.org, vireshk@kernel.org, daniel.lezcano@linaro.org, rjw@rjwysocki.net, linux-kernel@vger.kernel.org, robh+dt@kernel.org, Nicola Mazzucato , sudeep.holla@arm.com, chris.redpath@arm.com, morten.rasmussen@arm.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 16-11-20, 11:33, Lukasz Luba wrote: > On 11/9/20 6:57 AM, Viresh Kumar wrote: > > On 06-11-20, 11:14, Lukasz Luba wrote: > > > I also had similar doubts, because if we make frequency requests > > > independently for each CPU, why not having N cooling devs, which > > > will set independently QoS max freq for them... > > > > > > What convinced me: > > > EAS and FIE would know the 'real' frequency of the cluster, IPA > > > can use it also and have only one cooling device per cluster. > > > > > > We would like to keep this old style 'one cooling device per cpuset'. > > > I don't have strong opinion and if it would appear that there are > > > some errors in freq estimation for cluster, then maybe it does make > > > more sense to have cdev per CPU... > > > > Let me rephrase my question. What is it that doesn't work _correctly_ > > with cdev per cpufreq policy in your case? What doesn't work well if > > the thermal stuff keeps looking at only the related_cpus thing and not > > the cpu-perf-dependencies thing? > > > > We don't have a platform which would be this per-cpu freq request, yet. > Thus it's hard to answer your question. The EAS would work in 'old > style' - cluster mode. I don't know how IPA would work on such HW > and SW configuration. To figure this out I need a real platform. Hmm, so who are going to be the users of this new stuff (dependent CPUs) ? I don't think cpufreq-cooling should be updated, unless there is a compelling reason to. The other one in energy model ? Why does it need this information ? Who else ? -- viresh _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel