On Wed, 13 Jan 2021, Jann Horn wrote: > Some brainstorming: > > Maybe you could have an atomic counter in kmem_cache_cpu that tracks > the number of empty frozen pages that are associated with a specific > CPU? So the freeing slowpath would do its cmpxchg_double, and if the The latencies of these functions are so low that any additional counter will have significant performance impacts. An atomic counter would be waay out there. > You could additionally have a plain percpu counter, not tied to the The performance critical counters are already all per cpu. I enhanced the percpu subsystem specifically to support latency critical operations in the fast path of the slab allocators.
