From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from dggsgout12.his.huawei.com (dggsgout12.his.huawei.com [45.249.212.56]) (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 E48303382F0; Sat, 31 Jan 2026 03:00:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.56 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769828413; cv=none; b=nIK6RH/tn1Uq2twd5+mW/or5S8kBOjimjqEa4uWDQgXfCHJUSlZ4BGtok59IoRrI2/FrIcynqMruT2AjmHInc8yale1VhQxBIX39ptePv0jBQCmPOAT3sOGM4lwhcnylEWC2dtH/NoNvOuIqDX2kTm3qKRuTcH1S9N5FXiiTHI8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769828413; c=relaxed/simple; bh=y+Cab3dQhVHz0xBzECojs2MRdDDVGQOQmnQpaYSYSMs=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=FjyohP8TCmupQeMp3zWhY/mWkdju2TcowMt6spXw/XO9rHpvp9W4jFpPeKjDm32N6f3+ANXr+RaHG6ZoMk7bsFcQy04y7YZHrK+Y70ma6ksFLyS25qTDs608FJwO8NW2ECLze3yIsFZQ14Z59g0Yl0C9U/cns/JSAYl0T+keWW8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.163.198]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTPS id 4f2yKL33PXzKHMP6; Sat, 31 Jan 2026 10:59:50 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.128]) by mail.maildlp.com (Postfix) with ESMTP id DF03940574; Sat, 31 Jan 2026 11:00:06 +0800 (CST) Received: from [10.67.111.176] (unknown [10.67.111.176]) by APP4 (Coremail) with SMTP id gCh0CgCXQvM2cH1pd+DjFg--.14099S2; Sat, 31 Jan 2026 11:00:06 +0800 (CST) Message-ID: <1f31d8d2-811d-4dff-b036-2eb201f623ba@huaweicloud.com> Date: Sat, 31 Jan 2026 11:00:05 +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: =?UTF-8?Q?Michal_Koutn=C3=BD?= Cc: tj@kernel.org, hannes@cmpxchg.org, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, inwardvessel@gmail.com, shakeel.butt@linux.dev, 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> <3a12eb16-3a91-4278-9dfd-6c6f424e7f9f@huaweicloud.com> Content-Language: en-US From: Chen Ridong In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CM-TRANSID:gCh0CgCXQvM2cH1pd+DjFg--.14099S2 X-Coremail-Antispam: 1UD129KBjvdXoWrZw4rXw1UGF48Zr4UXF15CFg_yoW3trc_Wr Z0yr1kCr15AFyIkwsFvF4rCrWqyay8Kry3A3ykWr47ZryavrnxJw1kCFy5ZF47G3WIkrn7 urn5ZanFv3sF9jkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUbxkYFVCjjxCrM7AC8VAFwI0_Gr0_Xr1l1xkIjI8I6I8E6xAIw20E Y4v20xvaj40_Wr0E3s1l1IIY67AEw4v_Jr0_Jr4l8cAvFVAK0II2c7xJM28CjxkF64kEwV A0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVWDJVCq3wA2z4x0Y4vE2Ix0cI8IcVCY1x02 67AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I 0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40E x7xfMcIj6xIIjxv20xvE14v26r106r15McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x 0Yz7v_Jr0_Gr1lF7xvr2IY64vIr41lFIxGxcIEc7CjxVA2Y2ka0xkIwI1lc7CjxVAaw2AF wI0_Jw0_GFyl42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4 xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1q6r43 MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I 0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWU JVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4UJVWxJrUvcSsGvfC2KfnxnUUI43ZEXa7IUb mii3UUUUU== X-CM-SenderInfo: hfkh02xlgr0w46kxt4xhlfz01xgou0bp/ On 2026/1/30 18:22, Michal Koutný wrote: > On Thu, Jan 29, 2026 at 05:51:33PM +0800, Chen Ridong wrote: >> We compiled with 'make allmodconfig'. > > A-ha. > >> The BUILD_BUG_ON(CGROUP_SUBSYS_COUNT > 16) macro worked correctly. > > Good. > >> Can I propose increasing the maximum number now? If we switch certain configs to >> default N and then a new subsystem is added later, the default configuration may >> work fine, but it will become a problem under allmodconfig — which some users >> actually rely on. >> >> Besides, this shouldn't be a major change, right? > > I'd like there to be gradual move away from legacy controllers code > captured in config defaults. > Could you adjust the commit message to stress out the allmodconfig tests? > Sure, will update. -- Best regards, Ridong