> > Take Itanium, it has 4 priv levels and the PMU counters can monitor > > at > > any priv levels or combination thereof? > > x86 has more priv rings too, but linux only uses 2, kernel (ring 0) and > user (ring 2 iirc). Does ia64 expose more than 2 priv levels in linux?
In a hardware virtualized environment x86 Linux uses at least four. And yes ia64 also exposes more I believe, e.g. it has the fancy "system calls that run in user context" -Andi ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp as they present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com _______________________________________________ perfmon2-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
