From: Arjan van de Ven <arjan@xxxxxxxxxxxxx> Date: Thu, 4 Dec 2008 18:50:02 -0800 > I would like to respectfully disagree with this some. The kernel needs > to abstract hardware to some degree for userspace. The problem in this > case is that userspace can't really do a better job, in fact it can > only do a worse job since it lacks the coordination capability of > knowing it has full control of all the hardware registers. The perfmon context abstraction dealt with that. Code using the perfmon interfaces provided a set of counter and control register values to the kernel. The kernel merely loaded and unloaded them when a process (or group of processes) ran. The kernel is a validity checker, and that minimal stuff is exactly what the perfmon kernel component implemented. -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
