From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 0E8533081AE; Mon, 27 Oct 2025 18:05:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761588344; cv=none; b=SgVlyvTOQu44yX+ThA8TeHQaXgcE62q0IVBTPnDBG+BS2NEk6XAFgRrzaZbAX/BJ3R0n34ChjEGBSuI69WabQr9CrmGuGGlrOCMC1kRfzKWsGdhh9U6TBJO9tFDh1PpiR8a7s+KCQ2HPOuyRo/UU76Lsw274TmlLlZvpIJhTkqU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761588344; c=relaxed/simple; bh=wgCi9Ns6pB1FTZmXRyJMfiJCFeTw2qdaAWD8i3X6+3E=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=ZIkF4mHC2PXV8Lj6+da54TokySUE64D66bV6qRXwcC1SBSWu3DGU4vESkwldZaC2KLuVc50h88P8/EgO1BuIPgsFHisrMi8zwRCSwlSj0ErWEthzrhgaRXNOV3u5nHHnaY3wbCx0YO23ViwKfNE/NP6e++LPQhDBEDYnLI3TV5g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=tD9SBQWj; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="tD9SBQWj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6C8E5C4CEF1; Mon, 27 Oct 2025 18:05:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761588343; bh=wgCi9Ns6pB1FTZmXRyJMfiJCFeTw2qdaAWD8i3X6+3E=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=tD9SBQWjeGLzTQ0V0fy/F5g6P0M7mpQhxtv48ZD1BUZYmVA+CAfI6FdaAmBRMU+mv bWXgRTuLYzmNNOTTRQz/dvilHw9YmuN+1prbpvn+o06FvQqP2YWhq2s7k+XRHNCob+ PowKNv6neni87VctfY8gZMsRXnLcSWNP4SG5Bmkq4GKV50TRrN4NHZC5j7mIHNmJsF 3zsLgqsNe5TeT4Qf0v7IIDKtVjO9y8Z7b2LKjEkJxfTk19IcaMDBccp36me3Xt0I6F fjAvcOwGYraZKPWTgNyBiQNy/TuyN/GOaYYmOV0p5yXKJQvUuZtJ/H+DvjeW4FO/0g fpoxCwZ7gF10Q== Date: Mon, 27 Oct 2025 08:05:42 -1000 From: Tejun Heo To: Peter Zijlstra Cc: David Vernet , Andrea Righi , Changwoo Min , linux-kernel@vger.kernel.org, sched-ext@lists.linux.dev, Wen-Fang Liu Subject: Re: [PATCH 3/3] sched_ext: Allow scx_bpf_reenqueue_local() to be called from anywhere Message-ID: References: <20251025001849.1915635-1-tj@kernel.org> <20251025001849.1915635-4-tj@kernel.org> <20251027091822.GH3245006@noisy.programming.kicks-ass.net> <20251027174953.GB3419281@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: <20251027174953.GB3419281@noisy.programming.kicks-ass.net> On Mon, Oct 27, 2025 at 06:49:53PM +0100, Peter Zijlstra wrote: > > That's what I thought too and the gap between balance() and pick_task() can > > be closed that way. However, while plugging that, I realized there's another > > bigger gap between ttwu() and pick_task() because ttwu() can directly > > dispatch a task into the local DSQ of a CPU. That one, there's no way to > > close without a global hook. > > This would've been prime Changelog material. As is the Changelog was so > vague I wasn't even sure it was that particular problem. > > Please update the changelog to be clearer. Oh yeah, good point. > Also, why is this patch already in a pull request to Linus? what's the > hurry. Hmmm? It shouldn't be. Let me check again. No, it isn't. What are you looking at? Thanks. -- tejun