Re: Re-implement MCE log ring buffer as per-CPU ring buffer

Huang Ying
2009-04-24T06:07:05Z

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On Wed, 2009-04-22 at 18:16 +0800, Robert Richter wrote:
> On 22.04.09 11:22:59, Ingo Molnar wrote:
> >
> > * Huang Ying <ying.huang@intel.com> wrote:
> >
> > > Re-implement MCE log ring buffer as per-CPU ring buffer for better
> > > scalability. Basic design is as follow:
> >
> > Before changing anything substantial in the MCE code it would be
> > necessary to clean up and then unify the 32-bit and 64-bit side of
> > the MCE code first. (Which essentially means extending the
> > 64-bit-only code to 32-bit)
>
> You may also want to consider to use the in-kernel ring_buffer api
> (include/linux/ring_buffer.h).

It seems that ring_buffer is not NMI-safe, while mcelog buffer will be
used in NMI context and interrupt context. When will ring_buffer to be
NMI-safe?

Best Regards,
Huang Ying

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