From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=90.155.50.34 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793963540; b=yF0k0X1P5xQed00hITMJIEv5UqBNe0FPe9lPagfNB3mn7TDhTb9Pzb648vi/vx+9z1qA lJdAOnbG7RDk4n+xhfN30tX3XB7Jq1jejaFXdi+goSShwV9iWbOQq1Qt0xmtJ/mxotje0 nwBu3I3ZKCpSZPTTUoVJ4+uiWgGbRF+DrioPPwY4k79JH4Dc0VMAvE2v85JgyISk56/WP 4LTQ6/JswxLk7YiRVLk7w58H0xJKC2AxR1t356nTRxLgLFC9f3XDbtISDUxRUE2qe19qO Wz69Pku8AkHctjD0KHqfSjxqcAbfQ432hfs523rDbTUFM5/lOMZNDFkBPn1ZbzQfZDg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793963540; h=DMARC-Filter:DKIM-Signature:Received:Received:Date:From:To:Cc: Subject:Message-ID:References:MIME-Version:Content-Type: Content-Disposition:In-Reply-To; bh=7DVhJx7Rbv9VPK3/O6fqaFnxiPFsrlzR18pmIMEOZnU=; b=3zW8hnCI/z5OtfzphxEvVzFpTDtO6QPN7S9kv767/KF3Egclbzq90JOx7Rr8kVwDACax k0NSM7vLcb9QtVGpqA0QxA87xxAeHj/wQZyHzNS1ftjtg45dfcjAFtLd/UCEKIjpL0Ulw ArjqdLO6vt/dp5aBT7+9Qmq8dYDecI2Mx5jAEHuLq9y8++lpRghRW1pbMN9zAV4VdRCPw AJRPzGxi9elb5vZBiSOb56HL7lRTjdPJckHHAktzKGiZTXWyg5hqJUcvX2Y3u8pRybH9C y8M046o8mBOf4+9Xr7nnUniCPcUYitZ5wnvERBUrEFhQQ85hprN+hdUXCRY7ANd/wkQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=infradead.org; spf=pass smtp.mailfrom=infradead.org; dkim=pass header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256 header.s=casper.20170209 header.b=KqKAeKgU; arc=none smtp.remote-ip=90.155.50.34 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DB088606A326; Fri, 6 Nov 2026 11:12:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org DB088606A326 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, unprotected) header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256 header.s=casper.20170209 header.b=KqKAeKgU 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=7DVhJx7Rbv9VPK3/O6fqaFnxiPFsrlzR18pmIMEOZnU=; b=KqKAeKgU8i/rkNAoYmHsxcFc7B +L+FKXAOwQ6aJaBIUha+98o9ifs93VozSXBfSZPUU23NKamZCrmw9goDrJAlejDFli81tQ5ebp1Me 7t81hca6I/IwPMGUzX5QQxO4z/ziU6ffPnKyB4QCOlUOh4N+tXfjnDUYhgUL0ZhxXlvo/FHye4INu 6RvRN8HiOyRT3ZstBjkQrnMWdO3S3hJykjTCad3+s8mUEZOJPXDBWF79xUVTIA/6N8kSWSW/cXaE6 qD4P3b/CqOy9iVVFsnZY9Sq9lQzCNJe03rcVngffFl9ToCRxgcTqYQYwrAyHrw7BESAVIXzaijARG bP/Mk7LQ==; 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 4.100.1 #2 (Red Hat Linux)) id 1xPHri-00000003I6l-0pEk; Fri, 06 Nov 2026 11:12:14 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 57E47300882; Fri, 06 Nov 2026 12:12:13 +0100 (CET) Date: Fri, 6 Nov 2026 12:12:13 +0100 From: Peter Zijlstra To: Sebastian Andrzej Siewior Cc: Tejun Heo , linux-rt-devel@lists.linux.dev, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , K Prateek Nayak , Johannes Weiner , Michal =?iso-8859-1?Q?Koutn=FD?= , John Ogness , Shrikanth Hegde , luca abeni , Yuri Andriaccio , Yuri Andriaccio Subject: Re: [PATCH] sched: Remove CONFIG_RT_GROUP_SCHED Message-ID: <20261106111213.GG1779021@noisy.programming.kicks-ass.net> References: <20261105164724.yxONBd03@linutronix.de> <20261105193010.tXUDDu2w@linutronix.de> <20261106105003.GU1813469@noisy.programming.kicks-ass.net> <20261106110435.5MWA_4Hw@linutronix.de> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261106110435.5MWA_4Hw@linutronix.de> On Fri, Nov 06, 2026 at 12:04:35PM +0100, Sebastian Andrzej Siewior wrote: > On 2026-11-06 11:50:03 [+0100], Peter Zijlstra wrote: > > On Thu, Nov 05, 2026 at 08:30:10PM +0100, Sebastian Andrzej Siewior wrote: > > > On 2026-11-05 07:19:27 [-1000], Tejun Heo wrote: > > > > Hello, Sebastian. > > > Hi Tejun, > > > > > > > > > > > I'm not against it but wonder whether it'd be useful to do it more gradually > > > > so that people can pipe up if they depend on it. ie. Mark it deprecated and > > > > put it behind EXPORT for a bit and then BROKEN before actual removal. > > > > > > I would be surprised if this is actually used especially since it is > > > cg-v1 and v2 is the default/ used by everyone (?). > > > > So I would love to actually delete this. But IIRC there were actually > > people who used it. > > That would mean that it is working which does surprise me. For some definition of 'work' :/