From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 61A1134D3A9 for ; Thu, 19 Feb 2026 16:55:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771520136; cv=none; b=ai0G8tRMQVYsZg1r2megozGrSawFIFYvTZyF1XxcdLn0DcViOi/wNYAJo2Y/XxdDlGGltjx7NkjqdPGqpBAYTbZDMMBjfL3np/ne4xdsriUuXTgGy6b/jmcCeDDcFz7UMm67/uXZn2cp2Zku8RSxHROsKmYvOseCdH7pvUETXXE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771520136; c=relaxed/simple; bh=lvmplGweKeayj6nrlHQIdTey7lxB21zrU6NMflfLy+E=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=RZ6RW2heGCnahYsGm6hAVhFEx2yRA1mADtvYvlgs9DfK1XyYQxdNSU97DvS8JGLny9D11nquuFuqjLFSL5dyOpOCt9jHhphc/IO8X3smhG9JTyLPo9de37dBgLlTlJjJt0RlpF5pUWqaEnTtzHG+cW53yiPISJpLlyqrjUCEoCo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=lmaBMRhq; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="lmaBMRhq" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=lvmplGweKeayj6nrlHQIdTey7lxB21zrU6NMflfLy+E=; b=lmaBMRhqIG31XT4cL+i73ocYtn cQG6HrIIpd3L14a5S1YUzdqcSiYrer1zvwwGMgdiiyp2zZSkqPTJuzMKSFbJB8psTQMe512DbaVgM 83Lmwd5NJTK3BcS+PbSfYOtldylvzfuAvdrd2h7IqneDt1MTXrSxNg5RQjY1Gqbumi5zwccatBx2u bJexNt/FUvBX4XOxMzhp9CEjM1eZTrQor3NhKDP0kWhyBgfXP7SlHD9TppvgtNRUy2XmdY3JWToIN euxUCV6FaCFmWmwbblWhsqPa3omagkeYyiYbo/EUrOcYzLjlryTOGhfC40cewBs5A6WAxpfU3X95H 68EvsG7A==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1vt7Iy-00000001a7E-1o0c; Thu, 19 Feb 2026 16:55:09 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id ED5EA300B40; Thu, 19 Feb 2026 17:55:07 +0100 (CET) Date: Thu, 19 Feb 2026 17:55:07 +0100 From: Peter Zijlstra To: Madadi Vineeth Reddy Cc: Tim Chen , Ingo Molnar , K Prateek Nayak , "Gautham R . Shenoy" , Vincent Guittot , Chen Yu , Juri Lelli , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Hillf Danton , Shrikanth Hegde , Jianyong Wu , Yangyu Chen , Tingyin Duan , Vern Hao , Vern Hao , Len Brown , Aubrey Li , Zhao Liu , Chen Yu , Adam Li , Aaron Lu , Tim Chen , Josh Don , Gavin Guo , Qais Yousef , Libo Chen , linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 15/21] sched/cache: Disable cache aware scheduling for processes with high thread counts Message-ID: <20260219165507.GN1395266@noisy.programming.kicks-ass.net> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Wed, Feb 18, 2026 at 11:24:05PM +0530, Madadi Vineeth Reddy wrote: > Is there a way to make this useful for architectures with small LLC > sizes? One possible approach we were exploring is to have LLC at a > hemisphere level that comprise multiple SMT4 cores. Is this hemisphere an actual physical cache level, or would that be artificial?