From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f196.google.com (mail-pl1-f196.google.com [209.85.214.196]) (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 608083921FB for ; Sat, 9 May 2026 09:36:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.196 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778319407; cv=none; b=KSmTmoAnGcqTEFZUXpaxMKg2mgAO2+8XIxOxzueq7IE1VeSfhRmjJOIBicb6mm/7b0y8x5dtia3c4qdxUBF3rhzkHW4g1KUhpGSvZaob6vJ2YI1AjwDbo4he/XphAX4lnId5QTMi6ZvPmi3kJ26ZgvtJiwEEZEKlqTnBVPDFwGQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778319407; c=relaxed/simple; bh=yiQpGL0pkorcVnklu6I4G+NbYMzQb5W0oastiLX2lIU=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Pk4kIpcReQS22Y4vBljm95SlSEq6hv+9R1YBkQzq/2Ri8QXY1ulKrkRT0MXuBAOAYXR6r4b+cwKx08xUx8m96dtsAcTjWtUY5aHDU9vH77bD2hxHGmZsJwVawDuXQjdzYlfQw2Ut2R2Be0D1JuX8jhkmSsSWg0dKaGRqKgw6JbQ= 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=NC5UVEaE; arc=none smtp.client-ip=209.85.214.196 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="NC5UVEaE" Received: by mail-pl1-f196.google.com with SMTP id d9443c01a7336-2ba4efedbeaso20271865ad.1 for ; Sat, 09 May 2026 02:36:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1778319406; x=1778924206; 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=yiQpGL0pkorcVnklu6I4G+NbYMzQb5W0oastiLX2lIU=; b=NC5UVEaECLocshQ1xeSuchX3hRmLi+LHbPDvV3aIINWmTm8WDVjEWhjcB8fzEOSpVz onl8de4GQiuEM5cgDUC5BfbT8TOGt4dHwKhHlKu+AZ6xMPwhyGXOOffe7pnUx9pOrkRC pBceTrgmIVpCwgJmSbQqHX0oLj3EvKJYK2qduSvKHrTCmhZbzcVNsrD/gjKyfnBv9yEp 3HWgbBmQSzd9Uk2wSPwEPDwv0F/yBxFvyELufSehKynkM7L2KbYckgR7lGgPrWaAZUbP 6mQyrqMu7jZvHD9kShvEmyQdHr74a1tvceugyRyldVXEI6AtwjnIzGb8BBF7a7p6Ud9V +S/A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778319406; x=1778924206; 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=yiQpGL0pkorcVnklu6I4G+NbYMzQb5W0oastiLX2lIU=; b=gOfGaFlicJypmiA2TasQNPvh/AYKdHf0ab0lE3XqiXmVHi5RhqPYMENKH+LPXw+9Oa PyuMH8WKZTrbPwX4k4lbx1wy94Jqy6d07CsXyLwNQToKpxVmqMxPGkUDItDbBF3/Mbku IqlrOw9t4vwkkPU85R3W3OIXOm4sxLBfsfSAV3CC2xu3pMdpkYID79GAHBCJbDKyfccK UcXrgCEunA0FcEvvYtbYOhzv+Ubr3jCvD9CvIYMGTh3DE43GDixaZKxXp8nienswWpmM iJxreo5oUronhwXL47JEksPy81p/RMZMtwV2R2K6/0BMdw0F5RPphA/cXkgY93zgyG9L 61xA== X-Forwarded-Encrypted: i=1; AFNElJ/4IFqu42GQi/5jsiaRQmHb2SVAyyCWTvjQAr7Ddh8KmqA7z94VtvwQZloYDR159Barce9zpFUj@vger.kernel.org X-Gm-Message-State: AOJu0YxsnjegHyPf/LYlsgA8aiX8OSKwagInRYq3sEbns3hKZoYsaybg ZRXZKDA9tbk+fft9gy49p2lRNRo10QsRxkFjQDmZCeHwUCv5H29WYAU8 X-Gm-Gg: Acq92OHDeZGrihAueJmWjZeDaARgLCqzrCqSbYcgtk89sQJs+hHtPnnRURNmKixgYmG cLra538f6NGHpB1gA8N0Q9YuKGNf8c/okf8pFm/8+JCumHkrPUF6kyd2ERTNw25vCIXPLL50YiH qHR0ki3h+wz4rGF9JiZK8bs2qqQlAA5kURw3EZ19MpqEOQiJ82O8uZEThCHoBHZ7phJg2Y6c36C Am+4cOzUfMACggKAfl9XjkoD67Aqgfb4ojEdfwOoVSHlsxhsMmGmjLDI7xIFBPSnll1awscyPyl FnnRbi2MdQ3pqcIdAnF7NLSnsCvpmEbCXtBk6dsN69E9ILvR1yiDqSvYn6wuHFAB1P5zFplnzVO z2JkbOLTIc9OJ+wb1ny4y3Ad1+dXzAuTsC7KAQLnqoqAgSJ1X/SYYXbaVigS8ZQ0N7ZZwrAfZIZ ++/47cN5DcdWrkXKzaa3FS4i6UfnD9lyY= X-Received: by 2002:a17:903:2bcb:b0:2ba:924b:3948 with SMTP id d9443c01a7336-2ba924b3b5bmr154695975ad.15.1778319405563; Sat, 09 May 2026 02:36:45 -0700 (PDT) Received: from [10.125.112.20] ([210.184.73.204]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2baf1d3ffa0sm47361875ad.25.2026.05.09.02.36.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 09 May 2026 02:36:45 -0700 (PDT) Message-ID: <92eebc24-9612-4ea3-9bd3-da4d437b4d81@gmail.com> Date: Sat, 9 May 2026 17:36:39 +0800 Precedence: bulk X-Mailing-List: cgroups@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] cgroup/cpuset: skip hardwall ancestor scan in v2 mode in cpuset_current_node_allowed() To: Tejun Heo Cc: longman@redhat.com, chenridong@huaweicloud.com, hannes@cmpxchg.org, mkoutny@suse.com, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260508062940.4094652-1-chenwandun@lixiang.com> <202d0aa0f8da75986a895ffbd564b78d@kernel.org> Content-Language: en-US From: Wandun In-Reply-To: <202d0aa0f8da75986a895ffbd564b78d@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 5/8/26 23:51, Tejun Heo wrote: > Hello, > > is_in_v2_mode() is also true for v1 mounted with cpuset_v2_mode, where > cpuset.mem_exclusive / cpuset.mem_hardwall are still settable. Would > that be a problem here? cpuset_v2() looks like a tighter fit. You're right, it is a problem. Under v1 + cpuset_v2_mode, CS_MEM_HARDWALL/CS_MEM_EXCLUSIVE can be set on non-root cpuset cgroup, so can't directly return true; I will fix it in v2. Best regards, Wandun > > Thanks. > > -- > tejun