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SubjectRe: [RFC 0/5] CR4 handling improvements
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

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...


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