From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1F25ACA9EAF for ; Mon, 21 Oct 2019 11:21:34 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E23E320679 for ; Mon, 21 Oct 2019 11:21:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="ATkGQbY8" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E23E320679 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=kj76LY8YCTTl2RHb9ZqC1WypMj6QhPC/YNhcCz12KgU=; b=ATkGQbY8CiNnrU oiZZfgvT7haVCRQ6Q2IDmpZ0z1X1IVGshTCTIZay5HTzjkEB12+NkByJ+osn4wL3IhIhrfi89319i CmhQORN00yL5ko9b5Lo/XueNjMG3XZvOi+84O3tjjBR7A7zg4z++MyQsHKHiuwM1YcxttF22Lb0S5 deCmRSxvJeudP3uIVhtSWRvWcgWLfNYy+v2xa3KoqWkJMhKr/i7Foodmyq5UIbAgwVt9M6WdwI54e eB1OtesULHRm7NhI47QrgYb75G42Q43qMQN2rO3CVt+GULVGV2JxJstEC8JaFW4FU54uh6/xCRk3E VXgbeR9fvaeptAyZplSQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iMVkj-0005ak-Ek; Mon, 21 Oct 2019 11:21:33 +0000 Received: from [217.140.110.172] (helo=foss.arm.com) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iMVkg-0005Zm-SV for linux-arm-kernel@lists.infradead.org; Mon, 21 Oct 2019 11:21:32 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 77069EBD; Mon, 21 Oct 2019 04:21:18 -0700 (PDT) Received: from bogus (e107155-lin.cambridge.arm.com [10.1.196.42]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 8F10E3F718; Mon, 21 Oct 2019 04:21:16 -0700 (PDT) Date: Mon, 21 Oct 2019 12:21:14 +0100 From: Sudeep Holla To: Yunfeng Ye Subject: Re: [PATCH v5] arm64: psci: Reduce the waiting time for cpu_psci_cpu_kill() Message-ID: <20191021112114.GC21581@bogus> References: <710429cc-4d88-b7c3-b068-5459cf8133b5@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <710429cc-4d88-b7c3-b068-5459cf8133b5@huawei.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191021_042130_966435_1B338F6B X-CRM114-Status: GOOD ( 12.64 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kstewart@linuxfoundation.org, mark.rutland@arm.com, lorenzo.pieralisi@arm.com, hushiyuan@huawei.com, catalin.marinas@arm.com, Sudeep Holla , "linux-kernel@vger.kernel.org" , linfeilong@huawei.com, David.Laight@ACULAB.COM, gregkh@linuxfoundation.org, tglx@linutronix.de, wuyun.wu@huawei.com, will@kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Oct 21, 2019 at 06:52:16PM +0800, Yunfeng Ye wrote: > In cases like suspend-to-disk and suspend-to-ram, a large number of CPU > cores need to be shut down. At present, the CPU hotplug operation is > serialised, and the CPU cores can only be shut down one by one. In this > process, if PSCI affinity_info() does not return LEVEL_OFF quickly, > cpu_psci_cpu_kill() needs to wait for 10ms. If hundreds of CPU cores > need to be shut down, it will take a long time. > > Normally, there is no need to wait 10ms in cpu_psci_cpu_kill(). So > change the wait interval from 10 ms to max 1 ms and use usleep_range() > instead of msleep() for more accurate timer. > > In addition, reducing the time interval will increase the messages > output, so remove the "Retry ..." message, instead, track time and > output to the the successful message. Reviewed-by: Sudeep Holla -- Regards, Sudeep _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel