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 1A01E4400 for ; Wed, 4 Sep 2024 14:02:18 +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=1725458541; cv=none; b=GA/27SQOqcscTRgj4TZYOmDoDJGpiaTyZRHPXKM8nD+ORmnrKe6k2Ruq+lG5tUhs0MIMqYLqFitjRNgWgVqnP+rShGagoJuI1Aj6hfYcS3Arcmm2EHtH7v8y4GqeCiOf4IZYCnZ4TcH+ToGn+/n1IXMPNNZxwKKNRmNDGXyTtTM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725458541; c=relaxed/simple; bh=UhwfhjmEIwfyrOt+eVdm6YsUWpdK6zDRlyoJSoqeNTI=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=OJnt55oXiiMh0wVbH4CTRN7Bz9S3Xh3zJGWuP0zlNYn7TlYMrOJYHzMkjmaA1ujE50Nvsgu19VChGIrDGSkUdRM8Eykp7AqpTv+JC3oSfkpMNbV6W1ECenk3lia365kEw3B9lnMMPr4wqOh0/Xzmg9WYY7gzwKPWBmewVuGXL7Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (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=X5Z93DQQ; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (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="X5Z93DQQ" 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=CZEi/jgdlEuh+YoqzZDjVAlHDyia1w9HPAhShC3zubc=; b=X5Z93DQQ9zeaVNGXoK+9OanCIx lr2iSWQLvrImTdO59nExoAAfCbAIUJffyC3tzyQzz15lhkw1vvI3PRWG7JVQ2NGPIUzx7eOLYVJ7V xu8b6utm7I+iE9H1V+kFH9Fl//zN/BMrxvPcVjf2C9/QK9yxXIzlq5UVdCQ4lD322ekrMYnJDXIAC sE8eKjxhQV3dN/yk01qQ6YNJ5/faVexv7MoBR64o9xeGIVBSOvDxTd2l9V1KrULsvsge+DRgFVOMR JYya7LKG2aB8Q/B4dkxBldk7u4ImLCs8AqBETpZ3Zga/9vu2mxWVRsMBoV8FjdCrmGS4UwB4IwjnJ FyYgZYDA==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1slqaJ-00000000EgQ-1rpv; Wed, 04 Sep 2024 14:02:11 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 7F5BD300642; Wed, 4 Sep 2024 16:02:10 +0200 (CEST) Date: Wed, 4 Sep 2024 16:02:10 +0200 From: Peter Zijlstra To: Phil Auld Cc: Frederic Weisbecker , Waiman Long , Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/3] sched/isolation: Add HK_FLAG_SCHED to nohz_full Message-ID: <20240904140210.GK4723@noisy.programming.kicks-ass.net> References: <20240818234520.90186-1-longman@redhat.com> <20240818234520.90186-2-longman@redhat.com> <7fa3dbd5-7c2e-4614-a5f4-258546cb090b@redhat.com> <4822d111-b02d-469a-a457-46392c35021f@redhat.com> <20240904130445.GI4723@noisy.programming.kicks-ass.net> <20240904134427.GA136544@pauld.westford.csb> 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: <20240904134427.GA136544@pauld.westford.csb> On Wed, Sep 04, 2024 at 09:44:27AM -0400, Phil Auld wrote: > > You can create single CPU partitions using cpusets dynamically. > > > > This is somewhat new though... Although you could turn off load balancing with > groups v1, in v2 you could not. I can't remember, but I think I stalled cpuset-v2 until this was adressed -- that is, AFAIR any v2 can actually do this too. You create many 1 cpu partitions. It is more cumbersome that v1, but it is very much doable.