On Wed, Oct 02, 2013 at 02:13:56PM +0200, Oleg Nesterov wrote: > In short: unless a gp elapses between _exit() and _enter(), the next > _enter() does nothing and avoids synchronize_sched().
That does however make the entire scheme entirely writer biased; increasing the need for the waitcount thing I have. Otherwise we'll starve pending readers.