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    SubjectRe: Re-implement MCE log ring buffer as per-CPU ring buffer
    On 24.04.09 14:06:50, Huang Ying wrote:
    > 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?

    You can use it in nmi context with separate read and write
    buffers. See this patch description:
    6dad828b76c7224a22ddc9ce7aa495d994f03b31

    Not sure if somebody will make the ring_buffer non-locking.

    -Robert

    --
    Advanced Micro Devices, Inc.
    Operating System Research Center
    email: robert.richter@amd.com



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