From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dl1-f51.google.com (mail-dl1-f51.google.com [74.125.82.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 89A5A32FA18 for ; Fri, 30 Jan 2026 01:25:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.51 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769736302; cv=none; b=W7EGSD4KL0bxYAVbJQOmtB6Z7Aj2H4eLbYR+B9oC1/2d6dqyPXK70Q/tURMKcaZwVOW4cXKHU7IoQ14eFqCGfMsWsi/DZrKMTlBS8wDWA87w+bZ2zrjmU9Dqqk6zBymQQUlIsLQPaWjUEgLUQqyTHgHwQShbjGU2YYw6yu8OkDE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769736302; c=relaxed/simple; bh=QPCRSENA4SFJhAH+HmqmvpZoOVaVA5wKYXLmrxDmbR4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=YA82ursgEnkj6J1eA24XLpc1DQE3h7tGMcOHzNwBQKK/qmpPeXbi03dP7K15i8sw+EDvswufYO+FndCedBs6Y2Ly6dMBry1TMEVZfupDygt3otUvRfLHQRvtmwq+DtFaC+4wEbzOdcCVRSvo5C8X0o2Xmkd857jLCz/KgSPZEjY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=UE5sX8U9; arc=none smtp.client-ip=74.125.82.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="UE5sX8U9" Received: by mail-dl1-f51.google.com with SMTP id a92af1059eb24-1233c155a42so2736852c88.1 for ; Thu, 29 Jan 2026 17:25:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1769736300; x=1770341100; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=ryNCiIbjOxXcd/t0kCSD2wpxWRoodaQ92ia7l5T9br8=; b=UE5sX8U9LI3MzdfQoGoE4Pk7IEbEt5SrNS19zUhpKD6Br/xVh9BpD/tD0vdu3fW/Ht t9yxpqUHJcJ1VlTleZ4IH2vH+wYLXjCHR/o84++C70wch8mkRoPlzBEezJKC+78gTV2N NCKCRCUaeX8JrYhH3LpBMq7agdjo9FK5MLJzY+ghSLkclQSgvXzyTwSHK4x3zZwPraOw g/74oCTY1xd+JDrRA9duVM3+jYF58IjmJHm/R2r8Ao2aom2tO6XQhUckVwzZ0CaFgVIn +djCRYGViVEcXi8Ryp0KrGbXqj8llvr1VbvEP9WsGX7p5dzNeFVYuBP55CGi3Pxs3YDa kn3g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769736300; x=1770341100; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-gg:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=ryNCiIbjOxXcd/t0kCSD2wpxWRoodaQ92ia7l5T9br8=; b=bMLJNMkI9232X6r40vPysjvT4Z+fwjuEogBmWGBufoTNKquLycahpgB2Ha8mg2pm1y 7u2zsL9/+R5V5dD/qOLUjPnIeHuXjQA/iBuaycdDYDy9Jh11yhdDYZL9BUWGqQ+yzJtV wP/vTAYuvi3zU2CsNeK2uKdBwuZzeTBdq7Nxe6ARFpujO8PZNsLcmFqSIj7wMCLVYX8Q i1OIWg5vKO28FggluJjwKSclabZnb0XN3t6blcgRlaHDhgeOGZCpS8XtKgmkdO29sqjJ KrdQxOP5h08wTl39TBGIxdeFMuLC8MSyOM63dIFJXqZBPRwnQC/CEEArTmuxuXDHnle+ I5tA== X-Forwarded-Encrypted: i=1; AJvYcCUUOQJHAulJNRDgdNLvTdzi54ottU+dRYfx8Wy6d8U/vZ3f4A3NNOlEochK+lyhktEwEoIpzCD2kLycuwpa/XtEuvA=@vger.kernel.org X-Gm-Message-State: AOJu0YxzpX3BPA3tWekVpzOTMeXpNezTfBx5sMubMiA9BDMZ7bpRZB9G WUhKHFTEzQi+sPjAhU9ezD+C43ZMKzNhz7rKDoxu95CwVVxGnwjL6VNc X-Gm-Gg: AZuq6aJRNvy70Bqp1+4rsRrmIhh15ans435MoYy6ABEDc57zA8xLSvLhboVGNdQ2Oxv 4ApFJnLaEv+a383g1d8no94XMMbiI/1ulKONgNXsKa2vDC3lIp4RHiSfYLbqDQY6dDdzFZU5Sxx 3OVqifd2o8M9SaeujWGKMWMYr+i3UW/b8Ww0ZbqyE+7+cVsWbNgStzV+F5cpTk80Tp4og0Xwbfh n/tv75JhUtvIklZlQVaY4DohGriDptVb2zYW71fMsEMqHAevOp7YjLFnT06pJ4YmlNlno766khl xrKYbgx+skKqQ/8aK3Em1/gXxWKQPsPiEnggIipzXPchb06ZDIrOZhL0XiFdxLnoAAi0ZBtFP5U 5gHzXzX98AOYE7vTxCWi1cjjh8rAW0rRxxXpll2d+K8zMyO0JU7pdf/o/KecPCrY3D2u9O9jfU8 AzWj2rOmhHpY8HemOX6XxfFTW4crYwUDxKImHr5yVwnbv+ X-Received: by 2002:a05:7022:b91:b0:11f:3483:bbaa with SMTP id a92af1059eb24-125c0fa0ed6mr768887c88.19.1769736300463; Thu, 29 Jan 2026 17:25:00 -0800 (PST) Received: from ?IPV6:2a03:83e0:1151:15:416e:86d1:92cd:3741? ([2620:10d:c090:500::2:15ff]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-124a9d7f789sm8300091c88.6.2026.01.29.17.24.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 29 Jan 2026 17:25:00 -0800 (PST) Message-ID: Date: Thu, 29 Jan 2026 17:24:58 -0800 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH -next] cgroup: increase maximum subsystem count from 16 to 32 To: Chen Ridong , tj@kernel.org, hannes@cmpxchg.org, mkoutny@suse.com, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, shakeel.butt@linux.dev Cc: cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, lujialin4@huawei.com References: <20260129063133.209874-1-chenridong@huaweicloud.com> Content-Language: en-US From: JP Kobryn In-Reply-To: <20260129063133.209874-1-chenridong@huaweicloud.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi Chen, On 1/28/26 10:31 PM, Chen Ridong wrote: > From: Chen Ridong > > The current cgroup subsystem limit of 16 is insufficient, as the number of > subsystems has already reached this maximum. Attempting to add new > subsystems beyond this limit results in boot failures. > > This patch increases the maximum number of supported cgroup subsystems from > 16 to 32, providing adequate headroom for future subsystem additions. > > Signed-off-by: Chen Ridong > --- [...] I gave this a run with with 32 controllers enabled (16 pre-existing, 16 custom) and can confirm it works as expected. Tested-by: JP Kobryn Acked-by: JP Kobryn