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    SubjectRe: [patch 2/2] x86 NMI-safe INT3 and Page Fault
    On 07/16/2010 11:32 AM, Avi Kivity wrote:
    >
    > How long would vmalloc_sync_all take with a few thousand mm_struct take?
    >
    > We share the pmds, yes? So it's a few thousand memory accesses. The
    > direct impact is probably negligible, compared to actually loading the
    > module from disk. All we need is to make sure the locking doesn't slow
    > down unrelated stuff.
    >

    It's not the memory accesses, it's the need to synchronize all the CPUs.

    -hpa


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