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=-2.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 B12BAC35241 for ; Sat, 25 Jan 2020 04:58:49 +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 83E2420838 for ; Sat, 25 Jan 2020 04:58:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="ulN+NkUv"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="kWYruwuK" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 83E2420838 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org 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:Reply-To:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version: References:Message-ID:Subject:To:From:Date:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=PyDhT1bNDKcnW/GJCS7vt+L3wOAuhNrTAzkH4C5vh7I=; b=ulN+NkUvom4iKU 9VPUsPOt8/mOhpvjqQ+duLFgH9HE/UBa++qIb3F9N6xS83ifmbfw7VEe2LFGVo7bFNeMKN68dic+3 OLoEbDnnO7zzyvg8jcxOXr7KU8bPKu3UslZmBgXh30RyB7tK6bjpH5CEfkGkRlOdLimE8UsUjBMaQ LxzJm+DQO94TeW0j1slFnf4dk/3uxy9jm9yA2HhmsMw0Zy/7F4jylom+0dNmDITYoarOM0f5ucjgW FF2E8ncTqrQxwe6LctxMONIO6OW5BNP+3YieGIw0lLVOnuCrtfyALhjrqgPrHMay9qoV0cfMc+W6G rI+gnjcOqxqwvkTcFj5Q==; 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 1ivDWy-0007k0-Mi; Sat, 25 Jan 2020 04:58:48 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1ivDWv-0007jC-Sr for linux-arm-kernel@lists.infradead.org; Sat, 25 Jan 2020 04:58:47 +0000 Received: from paulmck-ThinkPad-P72.home (50-39-105-78.bvtn.or.frontiernet.net [50.39.105.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 32D382075E; Sat, 25 Jan 2020 04:58:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579928325; bh=se8AI+drmz8YaJ/8zhHySxcdJx3cDLiDs/OjJa17Oco=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=kWYruwuKFzmpVprbEiv42WnO1l8hPIhsYJNU87fNFTiwlnIhfPi7wZUzk+7FyHg0t vre9xtm/9e6IgK94Oz2vMRqqCgXVwRQ4V4L2CGyHGqPTraGzKuAiCjU3yHAP7L0KoH hFfWTERFAbBf41FQBHKC55IS0rkQ66hdbmergH+g= Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id 04EDD352018E; Fri, 24 Jan 2020 20:58:45 -0800 (PST) Date: Fri, 24 Jan 2020 20:58:45 -0800 From: "Paul E. McKenney" To: Waiman Long Subject: Re: [PATCH v9 0/5] Add NUMA-awareness to qspinlock Message-ID: <20200125045844.GC2935@paulmck-ThinkPad-P72> References: <20200115035920.54451-1-alex.kogan@oracle.com> <20200124222434.GA7196@paulmck-ThinkPad-P72> <6AAE7FC6-F5DE-4067-8BC4-77F27948CD09@oracle.com> <20200125005713.GZ2935@paulmck-ThinkPad-P72> <02defadb-217d-7803-88a1-ec72a37eda28@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: 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-20200124_205845_959477_4B51D425 X-CRM114-Status: GOOD ( 15.99 ) 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: , Reply-To: paulmck@kernel.org Cc: linux-arch@vger.kernel.org, guohanjun@huawei.com, Arnd Bergmann , Peter Zijlstra , dave.dice@oracle.com, jglauber@marvell.com, x86@kernel.org, Will Deacon , linux@armlinux.org.uk, linux-kernel@vger.kernel.org, Ingo Molnar , bp@alien8.de, hpa@zytor.com, Alex Kogan , steven.sistare@oracle.com, tglx@linutronix.de, daniel.m.jordan@oracle.com, linux-arm-kernel 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 Fri, Jan 24, 2020 at 09:17:05PM -0500, Waiman Long wrote: > On 1/24/20 8:59 PM, Waiman Long wrote: > >> You called it! I will play with QEMU's -numa argument to see if I can get > >> CNA to run for me. Please accept my apologies for the false alarm. > >> > >> Thanx, Paul > >> > > CNA is not currently supported in a VM guest simply because the numa > > information is not reliable. You will have to run it on baremetal to > > test it. Sorry for that. > > Correction. There is a command line option to force CNA lock to be used > in a VM. Use the "numa_spinlock=on" boot command line parameter. As I understand it, I need to use a series of -numa arguments to qemu combined with the numa_spinlock=on (or =1) on the kernel command line. If the kernel thinks that there is only one NUMA node, it appears to avoid doing CNA. Correct? Thanx, Paul _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel