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    SubjectRe: [PATCH 3/3] x86, extable: Handle early exceptions
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    On Thu, Apr 19, 2012 at 3:16 PM, H. Peter Anvin <hpa@zytor.com> wrote:
    > One thing that probably would give more of a boost is to use a rbtree or
    > similar structure to figure out *which* extable (if any) we should be
    > looking at; right now it looks like we linearly walk the modules, and
    > don't even look to see if we are inside that module before we do a
    > bsearch in that module's extable...

    How many entries are in the extable for a typical module? Perhaps it might
    make sense to bundle them all into one sorted combined table? Of course
    you would have to have a way to squeeze them back out of the combined
    table at module unload time.

    This moves the cost to module load/unload time ... which is hopefully rare
    compared to table lookup.

    -Tony


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