On Tue, 14 Oct 2014, Andy Lutomirski wrote: > This little series tightens up rdpmc permissions. With it applied, > rdpmc can only be used if a perf_event is actually mmapped. For now, > this is only really useful for seccomp.
So just to be difficult... I am aware of at least one group who is doing low-latency performance measures using rdpmc on Linux. They start the counters manually by poking the MSRs directly (bypassing perf_event_open()). They use rdpmc, grateful for the fact that currently CR4 is set up so they can do this w/o patching the kernel. These patches of course would break this use case... Vince -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
