On Thu, 25 Aug 2011, Peter Zijlstra wrote: > On Thu, 2011-08-18 at 14:40 -0700, Andrew Morton wrote: > > > > I think I'll apply it, as the call frequency is low (correct?) and the > > problem will correct itself as other architectures implement their > > atomic this_cpu_foo() operations. > > Which leads me to wonder, can anything but x86 implement that this_cpu_* > muck? I doubt any of the risk chips can actually do all this. > Maybe Itanic, but then that seems to be dying fast. The cpu needs to have an RMW instruction that does something to a variable relative to a register that points to the per cpu base. Thats generally possible. The problem is how expensive the RMW is going to be. -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>