From: Paul Mackerras <paulus@xxxxxxxxx> Date: Fri, 5 Dec 2008 11:33:31 +1100 > This is going to be a huge problem, at least on powerpc, because it > means that the kernel will have to know which events can be counted on > which counters and what values need to be put in the control registers > to select them. Sparc64 is the same. > The situation will be even worse with POWER5 and POWER6, where the > event selection logic is very complex, with multiple layers of > multiplexers. I really really don't want the kernel to have to know > about all that. Niagara2 has deep multiplexing and sub-event masking too. I really appreciated how perfmon kept all of those details in userspace. -- 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
