[Xen-ia64-devel][PATCH]Build new infrastructure for fast fault handling path.

["Xu, Anthony" <anthony.xu@xxxxxxxxx>]

Build new infrastructure for fast fault handling path.

1. use jump table to dispatch virtualization faults.
2. for virtualization faults, handler is executed with psr.i=0,
psr.ic=0, psr.bn=0.
        less context switch.
3. use register stack instead of memory stack to switch context.
4. Use C code to handle faults as possible, to reduce maintanance
efforts, 
        remove assembly handlers for rsm , ssm, mov to psr, mov to rr.
5. add fast path C handler for rsm, ssm, mov to psr, rfi.


Signed-off-by, Anthony Xu < anthony.xu@xxxxxxxxx >




Get some performance data on KB and sysbench, no explicit change.

While can move more handlers to this fast path.


Thanks,
Anthony

Attachment: 20080508.patch
Description: 20080508.patch

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