On Fri, 2013-01-18 at 10:04 -0500, Steven Rostedt wrote: Just to be more complete: > CPU0 CPU1 > ---- ---- c = __this_cpu_ptr(s->cpu_slab); <migrates to CPU0> > <cpu fetches c->page> <another task> > updates c->tid > updates c->page > updates c->freelist > <cpu fetches c->tid> > <cpu fetches c->freelist> > > node_match() succeeds even though > current c->page wont > <migrates back to CPU 1> > this_cpu_cmpxchg_double() only tests > the object (freelist) and tid, both which > will match, but the page that was tested > isn't the right one. > Yes, it's very unlikely, but we are in the business of dealing with the very unlikely. That's because in our business, the very unlikely is very likely. Damn, I need to buy a lotto ticket! -- Steve -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>