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[Xen-ia64-devel][PATCH]Build new infrastructure for fast fault handling
| To: | "Alex Williamson" <alex.williamson@xxxxxx>, "Isaku Yamahata" <yamahata@xxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-ia64-devel][PATCH]Build new infrastructure for fast fault handling path. |
| From: | "Xu, Anthony" <anthony.xu@xxxxxxxxx> |
| Date: | Thu, 8 May 2008 16:51:56 +0800 |
| Cc: | xen-ia64-devel <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Thu, 08 May 2008 01:52:22 -0700 |
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| Thread-topic: | [Xen-ia64-devel][PATCH]Build new infrastructure for fast fault handling path. |
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
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