On Fri, Oct 03, 2014 at 01:27:52PM -0700, Andy Lutomirski wrote: > On Fri, Oct 3, 2014 at 1:22 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote: > > > > We could make the rule be that RDPMC is enabled if a perf event is > > mmapped or TIF_SECCOMP is clear, but I'd prefer to be convinced that > > there's an actual performance issue first. Ideally we can get this > > all working with no API or ABI change at all. > > No, we can't use that rule. But we could say that RDPMC is enabled if > a perf event is mmapped and no thread in the mm uses seccomp. I'll > grumble a little bit about adding yet another piece of seccomp state. Well, we could simply disable the RDPMC for everything TIF_SECCOMP. Should be fairly straight fwd. -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
