On Wed, Aug 13, 2025 at 08:50:43AM +0800, Wangyang Guo wrote: > When multiple threads waiting for lock at the same time, once lock owner > releases the lock, waiters will see lock available and all try to lock, > which may cause an expensive CAS storm. > > Binary exponential backoff is introduced. As try-lock attempt increases, > there is more likely that a larger number threads compete for the same > lock, so increase wait time in exponential. You shouldn't be using virt_spin_lock() to begin with. That means you've misconfigured your guest. We have paravirt spinlocks for a reason.
