On Fri, 2013-09-27 at 16:50 +0200, Peter Zijlstra wrote: > On Fri, Sep 27, 2013 at 07:34:55AM -0700, Joe Perches wrote: > > That would make it seem as if all barriers are SMP no? > > I would think any memory barrier is ordering against someone else; if > not smp then a device/hardware -- like for instance the hardware page > table walker. > > Barriers are fundamentally about order; and order only makes sense if > there's more than 1 party to the game. But not necessarily more than 1 kind of parties. It is perfectly possible to have a barrier against other threads running the same function. Regards Oliver -- 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>