From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 13D023D6479 for ; Wed, 9 Sep 2026 21:51:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788990698; cv=none; b=tyx2GJGVlrI6WfnNqeabbMukp2cwEkTa9SmGJ2iiyQU5s4IJD2jRIU8nn9KnCx0rZqzlg2c3y9vZxkbmN6CjjGLNrHFt1fRSbvjf9aDuOW3J95VrC1BDOLSDFcW9PqxSUTcXNMF1e9SAQBgm5kFcr+F3eqQ6amLNNXsDRifapEI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788990698; c=relaxed/simple; bh=Ndd2XrO22ju/jqARH9zd8coBZawekux8q7hWoL0RXco=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=kb/ES3CWc0xY5Bh//NTQZ2s6FQyNcHWz3cixsXbJ3t+PzDhj07fvkl1b87mcPid7cbdQKLwTuAvN+MR2dheQtAXy8ZgSPI503KJVVQ9h1ZHHPgzDfMq+3H+WYEylSfQH3W+UahcEYvC2xyxMBjYN7KJK+N7o+cxdI3iL9vqa0Bs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=pass smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=aWbMEsGX; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=pass 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="aWbMEsGX" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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=DYuwB6DL5qoXxnem2Sh49UaLWIq/5mk6bF4glzH7dyA=; b=aWbMEsGXXdzPU/bx+iCtaVcm8e nRg2aqSvGS3f4uve5u3Ke2K4GEO+BE93YcSEFve6tsM7QLcgvDpPg/q4wx8Im5J1Mwy/pLJx9g9pS jgROHSedbRoJ6EqqhPXHI1qFLxlIskGJeoGXTY54fo+jKQfS0+MahJzA5uTyrrnLgFBuailVAOylH j5lGomeixCyu8vSf0Z7F8fv/bZnKXIKpVjv9gpFYYUPHPZ64RfMdnL6R67s/YIcx5SO50G4DOHDBy YJ40ynKuYYisOAFmRlgPyWKvxjM7E02SVl05cWmTFCWWpxZM2RoGW+A5qeplnqiXqgY8EPx2pCEpB mqjJlybg==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1x4QCM-0000000A1ca-3w9W; Wed, 09 Sep 2026 21:51:19 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 016EE300A9A; Wed, 09 Sep 2026 23:51:17 +0200 (CEST) Date: Wed, 9 Sep 2026 23:51:17 +0200 From: Peter Zijlstra To: Will Deacon Cc: Andrea Righi , Ingo Molnar , Juri Lelli , Vincent Guittot , Catalin Marinas , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , K Prateek Nayak , Mark Rutland , Christian Loehle , Shrikanth Hegde , Phil Auld , Breno Leitao , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v5 0/2] sched: Enable preferred SMT siblings on NVIDIA Olympus Message-ID: <20260909215117.GO776954@noisy.programming.kicks-ass.net> References: <20260909062649.469633-1-arighi@nvidia.com> <20260909131415.GB4120091@noisy.programming.kicks-ass.net> 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, Sep 09, 2026 at 04:36:01PM +0100, Will Deacon wrote: > On Wed, Sep 09, 2026 at 03:14:15PM +0200, Peter Zijlstra wrote: > > On Wed, Sep 09, 2026 at 08:26:07AM +0200, Andrea Righi wrote: > > > > > Andrea Righi (2): > > > arm64: topology: Prefer PE0 on NVIDIA Olympus SMT cores > > > sched/fair: Honor asymmetric SMT priority in idle selection > > > > > > arch/arm64/include/asm/topology.h | 1 + > > > arch/arm64/kernel/smp.c | 1 + > > > arch/arm64/kernel/topology.c | 51 +++++++++++++++++++++++ > > > kernel/sched/fair.c | 85 +++++++++++++++++++++++++++++++-------- > > > kernel/sched/sched.h | 6 +++ > > > kernel/sched/topology.c | 36 +++++++++++++++++ > > > 6 files changed, 163 insertions(+), 17 deletions(-) > > > > I tentatively picked these up, but I need an arm64 ack before I can > > merge them, and ideally vingu will bless them too :-) > > We've had five versions of this in five minutes, but the arch code is > pretty filthy tbh. Detecting topology based on MIDR is a non-starter, > sorry. Yeah, Andrea is a wee bit fast with re-posting. I'll drop this, no worries.