From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 A69F647D94B; Thu, 8 Oct 2026 09:10:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791450619; cv=none; b=a6lQgWB8XzgraQz4jlg+tKf8Eiw/K1oCppv6Ecds6uwAm33sh6fzl2AEH7WYyuDYu409Nw1Joo95BBEoaFY351SMUsSUJyNnq3ebh5HmB4/EG/aitCxYBaGYVlm7huK/qwaCLRk2OiIcLzStATGDI5qrJoLFEaZMQGPfiI8wDNk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791450619; c=relaxed/simple; bh=gHXiZOjSPhy7yIYQ5MQBzefZj48yRXjuS8rQGuDjlMo=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=rKgiUofXdv1l9Ph0MQN+L3o/b7v+uBKiU2+Ylv1rvt6dY0+BEKYWhl7pnhrSd0V4YXxlnnLxqjeoXKqAjc/XKdkXukUlgKkzynezZKMocNoOd2Q4QzHFzW3YUvBvj+6grH+E+vBrp6CJtLEeFhNsN/cz8P6x1Uu0uKROJ9UohMs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dmPTbvLy; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="dmPTbvLy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C09DE1F000FF; Thu, 8 Oct 2026 09:10:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1791450615; bh=9cHiO4vEi5SO1lugwnlKoeeteE2nFoFExmsN+xw5w7c=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=dmPTbvLyWbFIYgOl0WwR6UYrL10nJp4xNJpAuH2/Qdagla3tsQQ/u/fCX2yxmHOlD 0a0yvk5uXmbApa0R93L/eVqdnrKW4w8CYxcpgNH6HOdKxYNhTWrXchyVTey7d1jA8u 3EzYfnnbm6wnIYaH0sq5nthXsAuhtMDZ/YvOm2RMxN/5qjgaD6dCOdvgnfcMJDdD5N B7qGB3aoZd/xWN4YSaBnYTz2904+KjznimhFX3ybFHVr8q7UI3qLKMqERfAYgoul1y 0Ma3/oLz4Kl6T71z4eSL/UV33+MwKLeqF8yLzN8yCezI2thfRXq6YOd17rOMqA5bZl GzzyJ7emzcwZg== Date: Wed, 07 Oct 2026 23:10:13 -1000 Message-ID: <68208eef89abff9423de730ef585327f@kernel.org> From: Tejun Heo To: Tao Cui Cc: David Vernet , sched-ext@lists.linux.dev, Andrea Righi , linux-kernel@vger.kernel.org, Changwoo Min Subject: Re: [REPORT] sched_ext: sub-scheduler tasks are severely under-scheduled vs root-owned tasks In-Reply-To: <163e2397-0e3e-4cc0-842b-0d36598d13d7@linux.dev> References: <163e2397-0e3e-4cc0-842b-0d36598d13d7@linux.dev> 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=UTF-8 Content-Transfer-Encoding: 7bit Hello, Tao. On Thu, Oct 08, 2026 at 04:36:49PM +0800, Tao Cui wrote: > A pair of minimal cid-form test > schedulers: a parent that grants SCX_CAP_PERF | SCX_CAP_ENQ_IMMED over > a cgroup to a child, and the child writing cpuperf target 1 from > ops.tick(). Can you explain exactly what you tested and how, including the scheduler source and complete reproduction steps? This isn't a useful bug report without that information. Thanks. -- tejun