From patchwork Tue Aug 22 11:28:02 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: 715994 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 4221BEE4996 for ; Tue, 22 Aug 2023 11:28:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233200AbjHVL2L (ORCPT ); Tue, 22 Aug 2023 07:28:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53322 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232031AbjHVL2L (ORCPT ); Tue, 22 Aug 2023 07:28:11 -0400 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 15778CCA; Tue, 22 Aug 2023 04:28:08 -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 297a6333ba3eafe4; Tue, 22 Aug 2023 13:28:06 +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 63DE9662D1E; Tue, 22 Aug 2023 13:28:06 +0200 (CEST) From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Anna-Maria Behnsen , Doug Smythies , Kajetan Puchalski , Peter Zijlstra Subject: [PATCH v1] cpuidle: teo: Avoid unnecessary variable assignments Date: Tue, 22 Aug 2023 13:28:02 +0200 Message-ID: <12275754.O9o76ZdvQC@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: gggruggvucftvghtrhhoucdtuddrgedviedruddvuddggedtucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvfevufffkfgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepffffffekgfehheffleetieevfeefvefhleetjedvvdeijeejledvieehueevueffnecukfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomhepfdftrghfrggvlhculfdrucghhihsohgtkhhifdcuoehrjhifsehrjhifhihsohgtkhhirdhnvghtqedpnhgspghrtghpthhtohepiedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegrnhhnrgdqmhgrrhhirgeslhhinhhuthhrohhnihigrdguvgdprhgtphhtthhopegushhmhihthhhivghssehtvghluhhsrdhnvghtpdhrtghpthhtohepkhgrjhgvthgr nhdrphhutghhrghlshhkihesrghrmhdrtghomhdprhgtphhtthhopehpvghtvghriiesihhnfhhrrgguvggrugdrohhrgh 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 From: Rafael J. Wysocki Notice that it is not necessary to assign tick_intercept_sum in every iteration of the first loop over idle states in teo_select(), because the intercept_sum value does not change after the assignment in a given iteration of the loop, so its value after the last iteration of the loop can be used for computing the tick_intercept_sum value directly. Modify the code accordingly. No intentional functional impact. Signed-off-by: Rafael J. Wysocki --- This is based on the pm-cpuidle-gov branch in linux-pm.git (which is included into linux-next too). --- drivers/cpuidle/governors/teo.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) Index: linux-pm/drivers/cpuidle/governors/teo.c =================================================================== --- linux-pm.orig/drivers/cpuidle/governors/teo.c +++ linux-pm/drivers/cpuidle/governors/teo.c @@ -450,8 +450,6 @@ static int teo_select(struct cpuidle_dri hit_sum += prev_bin->hits; recent_sum += prev_bin->recent; - tick_intercept_sum = intercept_sum; - if (dev->states_usage[i].disable) continue; @@ -484,7 +482,8 @@ static int teo_select(struct cpuidle_dri goto end; } - tick_intercept_sum += cpu_data->state_bins[drv->state_count-1].intercepts; + tick_intercept_sum = intercept_sum + + cpu_data->state_bins[drv->state_count-1].intercepts; /* * If the sum of the intercepts metric for all of the idle states