From patchwork Tue Feb 25 04:25:45 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 3712681 Return-Path: X-Original-To: patchwork-linux-arm@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 7383BBF13A for ; Tue, 25 Feb 2014 04:28:18 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9E37420165 for ; Tue, 25 Feb 2014 04:28:17 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A91742013D for ; Tue, 25 Feb 2014 04:28:16 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WI9bz-0001Sv-6m; Tue, 25 Feb 2014 04:27:19 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1WI9br-0003RF-Gq; Tue, 25 Feb 2014 04:27:11 +0000 Received: from mezzanine.sirena.org.uk ([2400:8900::f03c:91ff:fedb:4f4]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WI9bZ-0003O7-KA for linux-arm-kernel@lists.infradead.org; Tue, 25 Feb 2014 04:26:55 +0000 Received: from [121.174.50.227] (helo=finisterre) by mezzanine.sirena.org.uk with esmtpsa (TLS1.2:DHE_RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from ) id 1WI9bB-0005PI-6O; Tue, 25 Feb 2014 04:26:29 +0000 Received: from broonie by finisterre with local (Exim 4.82) (envelope-from ) id 1WI9at-0004nq-CZ; Tue, 25 Feb 2014 13:26:11 +0900 From: Mark Brown To: Lorenzo Pieralisi , Catalin Marinas , Will Deacon Date: Tue, 25 Feb 2014 13:25:45 +0900 Message-Id: <1393302345-18253-5-git-send-email-broonie@kernel.org> X-Mailer: git-send-email 1.9.0.rc3 In-Reply-To: <1393302345-18253-1-git-send-email-broonie@kernel.org> References: <1393302345-18253-1-git-send-email-broonie@kernel.org> X-SA-Exim-Connect-IP: 121.174.50.227 X-SA-Exim-Mail-From: broonie@sirena.org.uk X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Subject: [PATCH 4/4] arm64: topology: Provide relative power numbers for cores X-SA-Exim-Version: 4.2.1 (built Mon, 26 Dec 2011 16:24:06 +0000) X-SA-Exim-Scanned: Yes (on mezzanine.sirena.org.uk) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140224_232654_140614_B57317CD X-CRM114-Status: GOOD ( 15.25 ) X-Spam-Score: -1.9 (-) Cc: linaro-kernel@lists.linaro.org, linux-arm-kernel@lists.infradead.org, Mark Brown X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Mark Brown Provide performance numbers to the scheduler to help it fill the cores in the system on big.LITTLE systems. With the current scheduler this may perform poorly for applications that try to do OpenMP style work over all cores but should help for more common workloads. The current 32 bit ARM implementation provides a similar estimate so this helps ensure that work to improve big.LITTLE systems on ARMv7 systems performs similarly on ARMv8 systems. The power numbers are the same as for ARMv7 since it seems that the expected differential between the big and little cores is very similar on both ARMv7 and ARMv8. In both ARMv7 and ARMv8 cases the numbers were based on the published DMIPS numbers. These numbers are just an initial and basic approximation for use with the current scheduler, it is likely that both experience with silicon and ongoing work on improving the scheduler will lead to further tuning or will tune automatically at runtime and so make the specific choice of numbers here less critical. Signed-off-by: Mark Brown --- arch/arm64/kernel/topology.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c index b330e79..e85560a 100644 --- a/arch/arm64/kernel/topology.c +++ b/arch/arm64/kernel/topology.c @@ -177,6 +177,8 @@ struct cpu_efficiency { * use the default SCHED_POWER_SCALE value for cpu_scale. */ static const struct cpu_efficiency table_efficiency[] = { + { "arm,cortex-a57", 3891 }, + { "arm,cortex-a53", 2048 }, { NULL, }, };