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From: Gang Li In-Reply-To: <642a3472-9570-409a-94e0-64f30966b86f@linux.dev> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 18195160006 X-Stat-Signature: 9yg8ycuqdfnaobcwktynbkg8a58krmi8 X-Rspam-User: X-HE-Tag: 1703673238-27429 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi Tim, According to queue_work_node, if there are no CPUs available on the given node, it will schedule to any available CPU. On 2023/12/18 14:46, Gang Li wrote: > On 2023/12/13 07:40, Tim Chen wrote: >> >>>       list_for_each_entry(pw, &works, pw_list) >>> -        queue_work(system_unbound_wq, &pw->pw_work); >>> +        if (job->numa_aware) >>> +            queue_work_node((++nid % num_node_state(N_MEMORY)), >> >> The nid may fall on a NUMA node with only memory but no CPU.  In that >> case you >> may still put the work on the unbound queue. You could end up on one >> CPU node for work >> from all memory nodes without CPU. Is this what you want?  Or you would >> like to spread them between CPU nodes? >> >> Tim > > Hi, thank you for your reminder. My intention was to fully utilize all > memory bandwidth. > > For memory nodes without CPUs, I also hope to be able to spread them on > different CPUs.