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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: linux-kernel@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