On Mon, Oct 09, 2023 at 04:42:56PM -0400, Gregory Price wrote: > == Mutex to Semaphore change: > > The memory tiering subsystem is extended in this patch set to have > externally available information (weights), and therefore additional > controls need to be added to ensure values are not changed (or tiers > changed/added/removed) during various calculations. > > Since it is expected that many threads will be accessing this data > during allocations, a mutex is not appropriate. > > Since write-updates (weight changes, hotplug events) are rare events, > a simple rw semaphore is sufficient. Given how you're using it, wouldn't the existing RCU mechanism be better than converting this to an rwsem?
