Re: [RFC 0/9] mce recovery for Sandy Bridge server

[Joerg Roedel]

On Tue, May 24, 2011 at 02:48:30PM -0700, Tony Luck wrote:

> But the case when I'd want to do the "stop this task" thing is when I
> think that I can recover - for memory errors detected while in kernel
> code I expect this will only ever be a few special cases:
> 1) copy to/from user
> 2) copy page (for copy-on-write fault)
> 3) ...
> and in these cases we don't have interrupts disabled.  In fact I have
> difficulty imagining a scenario where the kernel trips over a memory
> error in interrupt disabled code that would ever be recoverable.

Perf itself has a copy_from_user_nmi which is used to collect stack
traces. But those non-preemptible user accesses can be moved out of
your special cases.

	Joerg

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