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    SubjectRe: [RFC/PATCH, 2/4] readX_check() performance evaluation
    On Wed, 28 Jan 2004 12:28:56 -0800 (PST)
    Linus Torvalds <> wrote:

    > Alternatively, if you get a lot of information at MCE time (CPU that did
    > the access + some device data), just queue up the information in a per-CPU
    > queue. You don't have to worry about overflow - you can just drop if if

    That assumes that the access happened with preempt off ?

    That's fine if it's guaranteed that the MCE still happened inside
    readl/writel. But if it's delayed longer for some reason there is no guarantee
    that you can find back to the CPU that caused the fault.

    Putting it into the pci_dev and using RCU would be probably better.

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