On 10/01, Paul E. McKenney wrote: > > On Tue, Oct 01, 2013 at 04:48:20PM +0200, Peter Zijlstra wrote: > > On Tue, Oct 01, 2013 at 07:45:37AM -0700, Paul E. McKenney wrote: > > > If you don't have cpuhp_seq, you need some other way to avoid > > > counter overflow. Which might be provided by limited number of > > > tasks, or, on 64-bit systems, 64-bit counters. > > > > How so? PID space is basically limited to 30 bits, so how could we > > overflow a 32bit reference counter? > > Nesting. Still it seems that UINT_MAX / PID_MAX_LIMIT has enough room. But again, OK lets make it ulong. The question is, how cpuhp_seq can help and why we can't kill it. Oleg. -- 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>