{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9727467","patent":{"patent_number":"US-9727467","title":"Preemptible-RCU CPU hotplugging while maintaining real-time response","assignee":null,"inventors":[],"filing_date":"2015-08-21T00:00:00.000Z","publication_date":"2017-08-08T00:00:00.000Z","cpc_codes":["G06F","G06F","G06F","G06F","G06F","G06F","G06F","G06F","G06F","G06F","G06F"],"num_claims":7,"abstract":"A grace period detection technique for a preemptible read-copy update (RCU) implementation that uses a combining tree for quiescent state tracking. When a leaf level bitmask indicating online/offline CPUs is fully cleared due to all of its assigned CPUs going offline as a result of hotplugging operations, the bitmask state is not immediately propagated to the root level of the combining tree as in prior art RCU implementations. Instead, propagation is deferred until all tasks are removed from an associated leaf level task list tracking tasks that were preempted inside an RCU read-side critical section. Deferring bitmask propagation obviates the need to migrate the task list to the combining tree root level in order to prevent premature grace period termination. The task list can remain at the leaf level. In this way, CPU hotplugging is accommodated while avoiding excessive degradation of real-time latency stemming from the now-eliminated task list migration."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Preemptible-RCU CPU hotplugging while maintaining real-time response","description":"A grace period detection technique for a preemptible read-copy update (RCU) implementation that uses a combining tree for quiescent state tracking. When a leaf level bitmask indicating online/offline ","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9727467","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-9727467","citation_suggestion":"Patentable. \"Preemptible-RCU CPU hotplugging while maintaining real-time response\" (US-9727467). https://patentable.app/patents/US-9727467","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9727467","json":"https://patentable.app/api/llm-context/US-9727467","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T12:31:43.584Z"}