Re: [tip:perfcounters/core] perf_counter: x86: Fix call-chain supportto use NMI-safe methods

[H. Peter Anvin]

Mathieu Desnoyers wrote:
> 
> Where is the kernel page fault handler grabbing any lock to service
> in-kernel page faults exactly ?
> 
> Those are usually considered as utterly simple page table fixups,
> nothing more.
> 

It doesn't, *because it doesn't have to*.  Your proposal requires that
page faults can be handled inside the page fault handler, and that's a
pretty tall order.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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