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 411F12E1C64 for ; Fri, 31 Oct 2025 15:44:58 +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=1761925503; cv=none; b=LhX0N0FAHw8JIQjQxG1K8Qaa7nzN3ezNGjK12SAGgbrPoWxQKyCLDsrZdr36oczm4g27AB8ds1XKiwf7ApDSjPeJ/+KVsBNVMF55xJPmJr3IlI+ExPB3UFITVtWkHYD5mIw2+PdciCes+tYKYyk9qmCzXkJUYx6fC71SY1mHxQI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761925503; c=relaxed/simple; bh=ypMtBGUhGuLGPMYw20TcunN3REtxMlShGKVp96O99z4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=YVVXeDfGh9/VYVH4spv7Yrsp2YeWOHoRh1RGSg7x86j6ugtIuJpehSDQh0OZHP92KmDSW0FUcS/hA68HzJfAur8dvHsCXDKOAPk1yATrslvcEmLcz7Q3JUPxuYwX2GzxsXf1w6Ny9QQDe+/tIg2670QrC8k8PwBcRrAAT6qA7sE= 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=oHC9Fmsu; 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="oHC9Fmsu" 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=u6TEXufq1HcpSsKv+Nf0HEDitWllQk6xb8XmwF2VTbM=; b=oHC9FmsuxpQlml9HeIH8y16IiR ML0ETOHns+t4AqqG+ckhyv/dKQnLv5srCtSfz7FvJVbEfxlSxZjPkooJSIZnpwiGNt8R0MeZquKUJ GLBdPLGhPKAbb7caahbSZ2uFjyMTpY3V440sUi7O64dDbCierjz1QqiYXoeqc8JJJtWMLi6iCA2IR SsLwl0ViTyssoI4PVcXxJb6im7NxOv2i19LzFQgu626te5se0KdOF3ZkPXmXRuOPex6oKYuGyot0n eubTQ3TEg22Z4LPl6Igt5YIIp3d2iXl7+LVxExtI1L9TFs6drZ/H9D4OTawwmb4m4hJX0ypYv4X6V OcekGdtA==; 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 1vEqRS-0000000BYeI-08mn; Fri, 31 Oct 2025 14:49:26 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 5E2B230029E; Fri, 31 Oct 2025 16:44:55 +0100 (CET) Date: Fri, 31 Oct 2025 16:44:55 +0100 From: Peter Zijlstra To: Gabriele Monaco Cc: Juri Lelli , linux-kernel@vger.kernel.org, Ingo Molnar , Clark Williams , arighi@nvidia.com Subject: Re: [RFC PATCH] sched/deadline: Avoid dl_server boosting with expired deadline Message-ID: <20251031154455.GU3245006@noisy.programming.kicks-ass.net> References: <20251014193300.GA1206438@noisy.programming.kicks-ass.net> <20251020141130.GJ3245006@noisy.programming.kicks-ass.net> <8dc29e28a4d87954378ef1d989e0374526b44723.camel@redhat.com> <20251030184205.GB2989771@noisy.programming.kicks-ass.net> <20251031130543.GV4068168@noisy.programming.kicks-ass.net> <1f2ad071e59db2ed8bc0b382ae202b7474d07afc.camel@redhat.com> <20251031152005.GT3245006@noisy.programming.kicks-ass.net> <2daa2e6217eeaa239616303626c0d73d808ae947.camel@redhat.com> 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: <2daa2e6217eeaa239616303626c0d73d808ae947.camel@redhat.com> On Fri, Oct 31, 2025 at 04:41:22PM +0100, Gabriele Monaco wrote: > > Humm, let me noodle a bit more on this. Also, I should see if I can get > > graphviz to draw ascii art state diagrams :-) > > Dot doesn't do it but graph-easy does reasonably well. yep, just found that. Seems to work well: +----------------------+ | A:init | <+ +----------------------+ | | | | 1:dl_server_start | 4:pick_task_dl v | 2:update_curr_dl_se +----------------------+ | +---------------------- | | | | | B:zero_laxity-wait | | +---------------------> | | <+------------------+ +----------------------+ | | | | | | 3:dl_server_timer | | v | | +----------------------+ | | +---------------------> | C:running | -+ | 2:update_curr_dl_se | +----------------------+ | | | | | 6:dl_server_timer | 5:update_curr_dl_se | | v | | +----------------------+ | +---------------------- | D:replenish | --------------------+ +----------------------+ Anyway, back to noodling on how to make it stop on idle :-)