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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E2AA5C00145 for ; Mon, 12 Dec 2022 14:04:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229613AbiLLOEC (ORCPT ); Mon, 12 Dec 2022 09:04:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35736 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231779AbiLLOD7 (ORCPT ); Mon, 12 Dec 2022 09:03:59 -0500 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D963210A5; Mon, 12 Dec 2022 06:03:57 -0800 (PST) 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=zo/qFnAsqAdA6EwHKj640zNf/rPC7C+O0LLjxizZbPo=; b=DShHQBeT/EtTb+uCAKmtYRUIZb zisvhtLlckkieQb8GDwzzSOEo0a1WLzx32KL7N2wVM/qhdpWOG9BU2Sqlaixg77WO+E9jaDJ9+sbj mBFzoxtXlpO2mFyZSDyjzIEjNM3rOfg7rgTP5pmkWa62F6MYlktm96GeKtADv/loadzHsRnjOwNdV 5uu5nqQxJ52LatHiXUKqIzTTOprO4sx327wlZ+gCzsEtr2K3MVUK4g5rHmglXn0ajdDklUDR5fsTC gZgl2VDa0v+pBAvOuxEb5JDt45LwENVOtU7JdGTYtFuQ/cDCv+K3yBdwioDb3yP7G9El7WO/Y0EPB 7eMifSgw==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1p4jOv-009n2o-7X; Mon, 12 Dec 2022 14:03:25 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id EDBAA300299; Mon, 12 Dec 2022 15:03:20 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id D4C2C2024870B; Mon, 12 Dec 2022 15:03:20 +0100 (CET) Date: Mon, 12 Dec 2022 15:03:20 +0100 From: Peter Zijlstra To: Tejun Heo Cc: torvalds@linux-foundation.org, mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@kernel.org, joshdon@google.com, brho@google.com, pjt@google.com, derkling@google.com, haoluo@google.com, dvernet@meta.com, dschatzberg@meta.com, dskarlat@cs.cmu.edu, riel@surriel.com, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, kernel-team@meta.com Subject: Re: [PATCH 31/31] sched_ext: Add a rust userspace hybrid example scheduler Message-ID: References: <20221130082313.3241517-1-tj@kernel.org> <20221130082313.3241517-32-tj@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221130082313.3241517-32-tj@kernel.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Nov 29, 2022 at 10:23:13PM -1000, Tejun Heo wrote: > From: Dan Schatzberg > > Atropos is a multi-domain BPF / userspace hybrid scheduler where the BPF > part does simple round robin in each domain and the userspace part > calculates the load factor of each domain and tells the BPF part how to load > balance the domains. > > This scheduler demonstrates dividing scheduling logic between BPF and > userspace and using rust to build the userspace part. And here I am, speaking neither Rust nor BPF. But really, having seen some of this I long for the UMCG patches -- that at least was somewhat sane and trivially composes, unlike all this madness.