From patchwork Tue Mar 8 09:31:17 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: plongepe X-Patchwork-Id: 8531011 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 [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id BDC1BC0554 for ; Tue, 8 Mar 2016 09:30:22 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id E4C142010B for ; Tue, 8 Mar 2016 09:30:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 09C72201C0 for ; Tue, 8 Mar 2016 09:30:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932115AbcCHJaU (ORCPT ); Tue, 8 Mar 2016 04:30:20 -0500 Received: from mga01.intel.com ([192.55.52.88]:43546 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932227AbcCHJaS (ORCPT ); Tue, 8 Mar 2016 04:30:18 -0500 Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga101.fm.intel.com with ESMTP; 08 Mar 2016 01:30:17 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.22,556,1449561600"; d="scan'208";a="665708927" Received: from tllab185.tl.intel.com ([10.102.161.63]) by FMSMGA003.fm.intel.com with ESMTP; 08 Mar 2016 01:30:16 -0800 From: Philippe Longepe To: linux-pm@vger.kernel.org Cc: srinivas.pandruvada@linux.intel.com, rafael@kernel.org Subject: [PATCH V6 2/4] intel_pstate: Optimize calculation for max/min_perf_adj Date: Tue, 8 Mar 2016 10:31:17 +0100 Message-Id: <1457429481-13283-6-git-send-email-philippe.longepe@linux.intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1457429481-13283-1-git-send-email-philippe.longepe@linux.intel.com> References: <1457429481-13283-1-git-send-email-philippe.longepe@linux.intel.com> 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 mul_fp(int_tofp(A), B) expands to: ((A << FRAC_BITS) * B) >> FRAC_BITS, so the same result can be obtained via simple multiplication A * B. Apply this observation to max_perf * limits->max_perf and max_perf * limits->min_perf in intel_pstate_get_min_max()." Signed-off-by: Philippe Longepe --- drivers/cpufreq/intel_pstate.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 114e4e0..c46d23a 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -828,11 +828,11 @@ static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max) * policy, or by cpu specific default values determined through * experimentation. */ - max_perf_adj = fp_toint(mul_fp(int_tofp(max_perf), limits->max_perf)); + max_perf_adj = fp_toint(max_perf * limits->max_perf); *max = clamp_t(int, max_perf_adj, cpu->pstate.min_pstate, cpu->pstate.turbo_pstate); - min_perf = fp_toint(mul_fp(int_tofp(max_perf), limits->min_perf)); + min_perf = fp_toint(max_perf * limits->min_perf); *min = clamp_t(int, min_perf, cpu->pstate.min_pstate, max_perf); }