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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: Rakie Kim wrote: > The weighted interleave policy distributes page allocations across multiple > NUMA nodes based on their performance weight, thereby improving memory > bandwidth utilization. The weight values for each node are configured > through sysfs. > > Previously, sysfs entries for configuring weighted interleave were created > for all possible nodes (N_POSSIBLE) at initialization, including nodes that > might not have memory. However, not all nodes in N_POSSIBLE are usable at > runtime, as some may remain memoryless or offline. > This led to sysfs entries being created for unusable nodes, causing > potential misconfiguration issues. > > To address this issue, this patch modifies the sysfs creation logic to: > 1) Limit sysfs entries to nodes that are online and have memory, avoiding > the creation of sysfs entries for nodes that cannot be used. > 2) Support memory hotplug by dynamically adding and removing sysfs entries > based on whether a node transitions into or out of the N_MEMORY state. > > Additionally, the patch ensures that sysfs attributes are properly managed > when nodes go offline, preventing stale or redundant entries from persisting > in the system. > > By making these changes, the weighted interleave policy now manages its > sysfs entries more efficiently, ensuring that only relevant nodes are > considered for interleaving, and dynamically adapting to memory hotplug > events. > > Co-developed-by: Honggyu Kim > Signed-off-by: Honggyu Kim > Co-developed-by: Yunjeong Mun > Signed-off-by: Yunjeong Mun > Signed-off-by: Rakie Kim > Reviewed-by: Oscar Salvador > Reviewed-by: Joshua Hahn > Reviewed-by: Gregory Price > Acked-by: David Hildenbrand Looks good. Reviewed-by: Dan Williams