Re: [tip:perf/core] perf/x86: Fix USER/KERNEL tagging of samples

From: Linus Torvalds
Date: Fri Jul 06 2012 - 14:17:14 EST

On Fri, Jul 6, 2012 at 11:12 AM, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> wrote:
> PEBS, BTS, LBR don't have CS. PEBS does have eflags.
> If we cannot do this I'm not sure what we can do :/

Well, you're passed in a "pt_regs". Which *does* have CS, and has it right.

If some code then changes the values in the pt_regs, it is *that* code
that needs to think twice about what it does. Where is that code?

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