From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 65A46C433FF for ; Mon, 5 Aug 2019 07:42:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2E77621855 for ; Mon, 5 Aug 2019 07:42:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726423AbfHEHmo (ORCPT ); Mon, 5 Aug 2019 03:42:44 -0400 Received: from comms.puri.sm ([159.203.221.185]:49670 "EHLO comms.puri.sm" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726394AbfHEHmo (ORCPT ); Mon, 5 Aug 2019 03:42:44 -0400 Received: from localhost (localhost [127.0.0.1]) by comms.puri.sm (Postfix) with ESMTP id AD8D8DF6EA; Mon, 5 Aug 2019 00:42:42 -0700 (PDT) Received: from comms.puri.sm ([127.0.0.1]) by localhost (comms.puri.sm [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 00cR1ykuyMYJ; Mon, 5 Aug 2019 00:42:41 -0700 (PDT) Subject: Re: [PATCH v3 6/7] thermal/drivers/cpu_cooling: Introduce the cpu idle cooling driver To: Daniel Lezcano , viresh.kumar@linaro.org, kevin.wangtao@linaro.org, leo.yan@linaro.org, edubezval@gmail.com, vincent.guittot@linaro.org, javi.merino@kernel.org, rui.zhang@intel.com, daniel.thompson@linaro.org Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org References: <1522945005-7165-7-git-send-email-daniel.lezcano@linaro.org> <20190805051111.24318-1-martin.kepplinger@puri.sm> <02ec23c3-37ee-4e9f-56a4-453a30a29747@puri.sm> <421c43a9-c721-05eb-1860-dfb5c042bc95@linaro.org> From: Martin Kepplinger Openpgp: preference=signencrypt Autocrypt: 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User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 In-Reply-To: <421c43a9-c721-05eb-1860-dfb5c042bc95@linaro.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org On 05.08.19 09:39, Daniel Lezcano wrote: > On 05/08/2019 08:53, Martin Kepplinger wrote: > > [ ... ] > >>>> +static s64 cpuidle_cooling_runtime(struct cpuidle_cooling_device *idle_cdev) >>>> +{ >>>> + s64 next_wakeup; >>>> + unsigned long state = idle_cdev->state; >>>> + >>>> + /* >>>> + * The function should not be called when there is no >>>> + * mitigation because: >>>> + * - that does not make sense >>>> + * - we end up with a division by zero >>>> + */ >>>> + if (!state) >>>> + return 0; >>>> + >>>> + next_wakeup = (s64)((idle_cdev->idle_cycle * 100) / state) - >>>> + idle_cdev->idle_cycle; >>>> + >>>> + return next_wakeup * NSEC_PER_USEC; >>>> +} >>>> + >>> >>> There is a bug in your calculation formula here when "state" becomes 100. >>> You return 0 for the injection rate, which is the same as "rate" being 0, >>> which is dangerous. You stop cooling when it's most necessary :) >>> >>> I'm not sure how much sense really being 100% idle makes, so I, when testing >>> this, just say if (state == 100) { state = 99 }. Anyways, just don't return 0. >>> >> >> oh and also, this breaks S3 suspend: > > What breaks the S3 suspend? The idle cooling device or the bug above ? The idle cooling device. I have to configure it out: remove CONFIG_CPU_IDLE_THERMAL to test suspend/resume again. Errors in the kernel log, see below. > >> Aug 5 06:09:20 pureos kernel: [ 807.487887] PM: suspend entry (deep) >> Aug 5 06:09:40 pureos kernel: [ 807.501148] Filesystems sync: 0.013 >> seconds >> Aug 5 06:09:40 pureos kernel: [ 807.501591] Freezing user space >> processes ... (elapsed 0.003 seconds) done. >> Aug 5 06:09:40 pureos kernel: [ 807.504741] OOM killer disabled. >> Aug 5 06:09:40 pureos kernel: [ 807.504744] Freezing remaining >> freezable tasks ... >> Aug 5 06:09:40 pureos kernel: [ 827.517712] Freezing of tasks failed >> after 20.002 seconds (4 tasks refusing to freeze, wq_busy=0): >> Aug 5 06:09:40 pureos kernel: [ 827.527122] thermal-idle/0 S 0 >> 161 2 0x00000028 >> Aug 5 06:09:40 pureos kernel: [ 827.527131] Call trace: >> Aug 5 06:09:40 pureos kernel: [ 827.527148] __switch_to+0xb4/0x200 >> Aug 5 06:09:40 pureos kernel: [ 827.527156] __schedule+0x1e0/0x488 >> Aug 5 06:09:40 pureos kernel: [ 827.527162] schedule+0x38/0xc8 >> Aug 5 06:09:40 pureos kernel: [ 827.527169] smpboot_thread_fn+0x250/0x2a8 >> Aug 5 06:09:40 pureos kernel: [ 827.527176] kthread+0xf4/0x120 >> Aug 5 06:09:40 pureos kernel: [ 827.527182] ret_from_fork+0x10/0x18 >> Aug 5 06:09:40 pureos kernel: [ 827.527186] thermal-idle/1 S 0 >> 162 2 0x00000028 >> Aug 5 06:09:40 pureos kernel: [ 827.527192] Call trace: >> Aug 5 06:09:40 pureos kernel: [ 827.527197] __switch_to+0x188/0x200 >> Aug 5 06:09:40 pureos kernel: [ 827.527203] __schedule+0x1e0/0x488 >> Aug 5 06:09:40 pureos kernel: [ 827.527208] schedule+0x38/0xc8 >> Aug 5 06:09:40 pureos kernel: [ 827.527213] smpboot_thread_fn+0x250/0x2a8 >> Aug 5 06:09:40 pureos kernel: [ 827.527218] kthread+0xf4/0x120 >> Aug 5 06:09:40 pureos kernel: [ 827.527222] ret_from_fork+0x10/0x18 >> Aug 5 06:09:40 pureos kernel: [ 827.527226] thermal-idle/2 S 0 >> 163 2 0x00000028 >> Aug 5 06:09:40 pureos kernel: [ 827.527231] Call trace: >> Aug 5 06:09:40 pureos kernel: [ 827.527237] __switch_to+0xb4/0x200 >> Aug 5 06:09:40 pureos kernel: [ 827.527242] __schedule+0x1e0/0x488 >> Aug 5 06:09:40 pureos kernel: [ 827.527247] schedule+0x38/0xc8 >> Aug 5 06:09:40 pureos kernel: [ 827.527259] smpboot_thread_fn+0x250/0x2a8 >> Aug 5 06:09:40 pureos kernel: [ 827.527264] kthread+0xf4/0x120 >> Aug 5 06:09:40 pureos kernel: [ 827.527268] ret_from_fork+0x10/0x18 >> Aug 5 06:09:40 pureos kernel: [ 827.527272] thermal-idle/3 S 0 >> 164 2 0x00000028 >> Aug 5 06:09:40 pureos kernel: [ 827.527278] Call trace: >> Aug 5 06:09:40 pureos kernel: [ 827.527283] __switch_to+0xb4/0x200 >> Aug 5 06:09:40 pureos kernel: [ 827.527288] __schedule+0x1e0/0x488 >> Aug 5 06:09:40 pureos kernel: [ 827.527293] schedule+0x38/0xc8 >> Aug 5 06:09:40 pureos kernel: [ 827.527298] smpboot_thread_fn+0x250/0x2a8 >> Aug 5 06:09:40 pureos kernel: [ 827.527303] kthread+0xf4/0x120 >> Aug 5 06:09:40 pureos kernel: [ 827.527308] ret_from_fork+0x10/0x18 >> Aug 5 06:09:40 pureos kernel: [ 827.527375] Restarting kernel threads >> ... done. >> Aug 5 06:09:40 pureos kernel: [ 827.527771] OOM killer enabled. >> Aug 5 06:09:40 pureos kernel: [ 827.527772] Restarting tasks ... done. >> Aug 5 06:09:40 pureos kernel: [ 827.528926] PM: suspend exit >> >> >> do you know where things might go wrong here? >> >> thanks, >> >> martin >> > >