On Wed, 2012-09-26 at 15:20 +0200, Andrew Jones wrote: > Wouldn't a clean solution be to promote a task's scheduler > class to the spinner class when we PLE (or come from some special > syscall > for userspace spinlocks?)? Userspace spinlocks are typically employed to avoid syscalls.. > That class would be higher priority than the > fair class and would schedule in FIFO order, but it would only run its > tasks for short periods before switching. Since lock hold times aren't limited, esp. for things like userspace 'spin' locks, you've got a very good denial of service / opportunity for abuse right there. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
