On Wed, 2012-06-27 at 15:26 -0700, Linus Torvalds wrote: > On Wed, Jun 27, 2012 at 2:15 PM, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> wrote: > > This originated from s390 which does something similar and would allow > > s390 to use the generic TLB flushing code. > > > > The idea is to flush the mm wide cache and tlb a priory and not bother > > with multiple flushes if the batching isn't large enough. > > > > This can be safely done since there cannot be any concurrency on this > > mm, its either after the process died (exit) or in the middle of > > execve where the thread switched to the new mm. > > I think we actually *used* to do the final TLB flush from within the > context of the process that died. That doesn't seem to ever be the > case any more, but it does worry me a bit. Maybe a > > VM_BUG_ON(current->active_mm == mm); > > or something for the fullmm case? OK, added it and am rebooting the test box.. -- 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