From patchwork Tue Aug 1 19:35:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 709099 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 77931C04A6A for ; Tue, 1 Aug 2023 19:41:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232279AbjHATlR (ORCPT ); Tue, 1 Aug 2023 15:41:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32904 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229880AbjHATlQ (ORCPT ); Tue, 1 Aug 2023 15:41:16 -0400 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9C4F61FF3; Tue, 1 Aug 2023 12:41:14 -0700 (PDT) Received: from localhost (127.0.0.1) (HELO v370.home.net.pl) by /usr/run/smtp (/usr/run/postfix/private/idea_relay_lmtp) via UNIX with SMTP (IdeaSmtpServer 5.2.0) id 9a48f1ec80921127; Tue, 1 Aug 2023 21:41:12 +0200 Authentication-Results: v370.home.net.pl; spf=softfail (domain owner discourages use of this host) smtp.mailfrom=rjwysocki.net (client-ip=195.136.19.94; helo=[195.136.19.94]; envelope-from=rjw@rjwysocki.net; receiver=) Received: from kreacher.localnet (unknown [195.136.19.94]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by v370.home.net.pl (Postfix) with ESMTPSA id 365E16621DD; Tue, 1 Aug 2023 21:41:12 +0200 (CEST) From: "Rafael J. Wysocki" To: Linux PM , Peter Zijlstra , Anna-Maria Behnsen Cc: LKML , Frederic Weisbecker , Kajetan Puchalski Subject: [RFC/RFT][PATCH v1 0/2] cpuidle: teo: Do not check timers unconditionally every time Date: Tue, 01 Aug 2023 21:35:15 +0200 Message-ID: <4511619.LvFx2qVVIh@kreacher> MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: clean X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedviedrjeeigddufeeiucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvfevufffkfgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepgeffhfdujeelhfdtgeffkeetudfhtefhhfeiteethfekvefgvdfgfeeikeeigfehnecuffhomhgrihhnpehkvghrnhgvlhdrohhrghenucfkphepudelhedrudefiedrudelrdelgeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpeduleehrddufeeirdduledrleegpdhhvghlohepkhhrvggrtghhvghrrdhlohgtrghlnhgvthdpmhgrihhlfhhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqpdhnsggprhgtphhtthhopeeipdhrtghpthhtoheplhhinhhugidqphhmsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhrtghpthhtohepphgvthgvrhiisehinhhfrhgruggvrggurdhorhhgpdhrtghpthhtoheprghnnhgrqdhmrghrihgrsehlihhnuhhtrhhonhhigidruggvpdhrtghpthhtoheplhhinhhugidqkhgvrhhnvghlsehvghgvrhdrkhgvrhhn vghlrdhorhhgpdhrtghpthhtohepfhhrvgguvghrihgtsehkvghrnhgvlhdrohhrghdprhgtphhtthhopehkrghjvghtrghnrdhpuhgthhgrlhhskhhisegrrhhmrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=6 Fuz1=6 Fuz2=6 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Hi Folks, This is on top of the fixes series posted previously: https://lore.kernel.org/linux-pm/4515817.LvFx2qVVIh@kreacher/ (I'll put it all into one git branch tomorrow). I started to play with the idea described here https://lore.kernel.org/linux-pm/CAJZ5v0hQh2Pg_uXxj8KBRw3oLS1WdsU+rUafBAAq7dRdbRwYSA@mail.gmail.com/ and this is the result. Note that this is completely experimental, even though it doesn't kill any of the test boxes I've run it on. Patch [1/2] moves the tick_nohz_get_sleep_length() call in teo_select() after a preliminary idle state selection based on statistics and patch [2/2] adds checks to avoid it completely if the idle state selected so far is shallow enough. I would appreciate checking if this actually makes any difference. Thanks!