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=-11.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham 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 C2996C4363A for ; Fri, 30 Oct 2020 10:25:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 69760221FA for ; Fri, 30 Oct 2020 10:25:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726339AbgJ3KZN (ORCPT ); Fri, 30 Oct 2020 06:25:13 -0400 Received: from mail.kernel.org ([198.145.29.99]:56470 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726316AbgJ3KZN (ORCPT ); Fri, 30 Oct 2020 06:25:13 -0400 Received: from gaia (unknown [95.145.162.19]) (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 DA8B420825; Fri, 30 Oct 2020 10:25:10 +0000 (UTC) Date: Fri, 30 Oct 2020 10:25:08 +0000 From: Catalin Marinas To: Vanshidhar Konda Cc: linux-arm-kernel@lists.infradead.org, patches@amperecomputing.com, linux-kernel@vger.kernel.org, Anshuman.Khandual@arm.com, Valentin.Schneider@arm.com, Will Deacon Subject: Re: [PATCH v2] arm64: NUMA: Kconfig: Increase NODES_SHIFT to 4 Message-ID: <20201030102507.GB23196@gaia> References: <20201029203752.1114948-1-vanshikonda@os.amperecomputing.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201029203752.1114948-1-vanshikonda@os.amperecomputing.com> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Oct 29, 2020 at 01:37:52PM -0700, Vanshidhar Konda wrote: > The current arm64 default config limits max NUMA nodes available on > system to 4 (NODES_SHIFT = 2). Today's arm64 systems can reach or > exceed 16 NUMA nodes. To accomodate current hardware and to fit > NODES_SHIFT within page flags on arm64, increase NODES_SHIFT to 4. > > Discussion on v1 of the patch: > https://lkml.org/lkml/2020/10/20/767 Better use a stable link to refer to the past discussion: Link: https://lore.kernel.org/r/20201020173409.1266576-1-vanshikonda@os.amperecomputing.com > Signed-off-by: Vanshidhar Konda > --- > arch/arm64/Kconfig | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index f858c352f72a..cffcc677011f 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -982,7 +982,7 @@ config NUMA > config NODES_SHIFT > int "Maximum NUMA Nodes (as a power of 2)" > range 1 10 > - default "2" > + default "4" > depends on NEED_MULTIPLE_NODES > help > Specify the maximum number of NUMA Nodes available on the target Acked-by: Catalin Marinas