> > > uvm_pagefree calls atomic_clearbits_int too many times. > > > > Is there some sort of evidence that this is a problem - performace or > > stability wise? > > Platforms which can't do ll/sc style atomic operations usually wrap > these operations within splhigh()/splx() calls, which are a tad > expensive. > > In that particular diff, Ted makes sure to flip the bits only during the > time the vm_page is not on any TAILQ, and before it is put on the free > list. > > This is narrow enough to me.
Same opinion.
