On 7/6/2023 11:34 AM, Alexei Starovoitov wrote: > From: Alexei Starovoitov <ast@xxxxxxxxxx> > > Introduce bpf_mem_[cache_]free_rcu() similar to kfree_rcu(). > Unlike bpf_mem_[cache_]free() that links objects for immediate reuse into > per-cpu free list the _rcu() flavor waits for RCU grace period and then moves > objects into free_by_rcu_ttrace list where they are waiting for RCU > task trace grace period to be freed into slab. > > The life cycle of objects: > alloc: dequeue free_llist > free: enqeueu free_llist > free_rcu: enqueue free_by_rcu -> waiting_for_gp > free_llist above high watermark -> free_by_rcu_ttrace > after RCU GP waiting_for_gp -> free_by_rcu_ttrace > free_by_rcu_ttrace -> waiting_for_gp_ttrace -> slab > > Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx> Acked-by: Hou Tao <houtao1@xxxxxxxxxx>
