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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 81B67CA0EDB for ; Tue, 12 Aug 2025 19:25:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:MIME-Version: References:Message-ID:In-Reply-To:Subject:cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=LITNVwYsu3oS8l/rbSIF4z8H+oLpOrzXSpVP2kU7r8k=; b=RDhgV5d/bK4w+yWjfHM8P8k/9g 8nW5YLgILfMlrX5toFhvfOLUdgoMYuYkGdeSILQieAA7oeXBhkOZWOP0dS5eeRJ2BqG++HkKLKVNr fT72NIfVfDJW3W3zI+HiV9c9wp1i8JaLbyuNaEFPbfTcOfLhm8JBZk4cteg7V3p0J0r/Iznn1AjFS TtJqI6z5gVRF1qB7j57PrriJf0YbbHTLlZchS6XYNXBFGLyqN1Uo6gzhP8qUpoNvHz8qb7DwHsEdn JEhrHXNS00GznAUc+ASd+8m8iPHKUSNTKu1SmR8urKuhHrS8ZATWH+Ibii9pDE3p5Tx/+D7+ggF/w kejGmyZA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1ulucE-0000000BpLB-10zN; Tue, 12 Aug 2025 19:24:58 +0000 Received: from gentwo.org ([62.72.0.81]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1ulsJC-0000000BUIK-0l1r for linux-arm-kernel@lists.infradead.org; Tue, 12 Aug 2025 16:57:11 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gentwo.org; s=default; t=1755016387; bh=LITNVwYsu3oS8l/rbSIF4z8H+oLpOrzXSpVP2kU7r8k=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=RcV+n56//A5TUysROsD7GbH1UfQ2bKozgbi5OYUlMnxswa/FA+2vGCd3rSJaPwyJP bk+elX6ttJIr4JNVohG341E+D0QGpH5wl0/VUYQUfMUxyozSiFtaYp0u5a2RlZLVJb FW2YTV5+geG2g6GeAJzdhQbIYAVyk1s5Dx+d57Qs= Received: by gentwo.org (Postfix, from userid 1003) id 72FA14025D; Tue, 12 Aug 2025 09:33:07 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by gentwo.org (Postfix) with ESMTP id 72019401EB; Tue, 12 Aug 2025 09:33:07 -0700 (PDT) Date: Tue, 12 Aug 2025 09:33:07 -0700 (PDT) From: "Christoph Lameter (Ampere)" To: Jeremy Linton cc: Huang Shijie , catalin.marinas@arm.com, will@kernel.org, patches@amperecomputing.com, Shubhang@os.amperecomputing.com, krzysztof.kozlowski@linaro.org, bjorn.andersson@oss.qualcomm.com, geert+renesas@glider.be, arnd@arndb.de, nm@ti.com, ebiggers@kernel.org, nfraprado@collabora.com, prabhakar.mahadev-lad.rj@bp.renesas.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] arm64: defconfig: enable CONFIG_SCHED_CLUSTER In-Reply-To: Message-ID: References: <20250808025533.6422-1-shijie@os.amperecomputing.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250812_095710_256478_45CDAF47 X-CRM114-Status: GOOD ( 14.66 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, 11 Aug 2025, Jeremy Linton wrote: > From what I've seen, SCHED_CLUSTER seems to be a bit of give and take > depending on benchmark and machine. I'm not sure if it should be default > enabled or not, but it would really be nice to have at least a larger sweep of > benchmarks/machines in order to be sure of the decision. If the hardware provides a clusterid then I think this clusterid should be used for the sched domains. CONFIG_SCHED_CLUSTER does that. So it should be the default. If there is no cluster information then these domains should not be created. I think that is already the case?