From patchwork Mon Feb 24 06:29:32 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: tuukka.tikkanen@linaro.org X-Patchwork-Id: 3706881 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 98406BF13A for ; Mon, 24 Feb 2014 07:48:03 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id E158520160 for ; Mon, 24 Feb 2014 07:48:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0C0CA20154 for ; Mon, 24 Feb 2014 07:48:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751480AbaBXHsA (ORCPT ); Mon, 24 Feb 2014 02:48:00 -0500 Received: from mx.mmd.net ([80.83.0.3]:55337 "EHLO mx.mmd.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751200AbaBXHr7 (ORCPT ); Mon, 24 Feb 2014 02:47:59 -0500 Received: from istutuskone.tic0.net (verkonrikkoja.tic0.net [80.83.5.104]) by mx.mmd.net (Postfix) with ESMTP id C8652ED5; Mon, 24 Feb 2014 09:26:27 +0200 (EET) From: Tuukka Tikkanen To: linux-pm@vger.kernel.org, rjw@rjwysocki.net Cc: daniel.lezcano@linaro.org, tuukka.tikkanen@linaro.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/7] Cpuidle: Use actual state latency in menu governor Date: Mon, 24 Feb 2014 08:29:32 +0200 Message-Id: <1393223377-5744-3-git-send-email-tuukka.tikkanen@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1393223377-5744-1-git-send-email-tuukka.tikkanen@linaro.org> References: <1393223377-5744-1-git-send-email-tuukka.tikkanen@linaro.org> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Currently menu governor records the exit latency of the state it has chosen for the idle period. The stored latency value is then later used to calculate the actual length of the idle period. This value may however be incorrect, as the entered state may not be the one chosen by the governor. The entered state information is available, so we can use that to obtain the real exit latency. Signed-off-by: Tuukka Tikkanen Acked-by: Daniel Lezcano --- drivers/cpuidle/governors/menu.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c index e9a2a27..115386a 100644 --- a/drivers/cpuidle/governors/menu.c +++ b/drivers/cpuidle/governors/menu.c @@ -124,7 +124,6 @@ struct menu_device { unsigned int next_timer_us; unsigned int predicted_us; - unsigned int exit_us; unsigned int bucket; unsigned int correction_factor[BUCKETS]; unsigned int intervals[INTERVALS]; @@ -298,7 +297,6 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev) } data->last_state_idx = 0; - data->exit_us = 0; /* Special case when user has set very strict latency requirement */ if (unlikely(latency_req == 0)) @@ -359,7 +357,6 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev) continue; data->last_state_idx = i; - data->exit_us = s->exit_latency; } return data->last_state_idx; @@ -410,8 +407,8 @@ static void menu_update(struct cpuidle_driver *drv, struct cpuidle_device *dev) * We correct for the exit latency; we are assuming here that the * exit latency happens after the event that we're interested in. */ - if (measured_us > data->exit_us) - measured_us -= data->exit_us; + if (measured_us > target->exit_latency) + measured_us -= target->exit_latency; /* Update our correction ratio */