[Xen-ia64-devel] [PATCH 0/2][RFC] set rr0 to rr4 hyperprivop

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

This patch introduce set rr0 to rr4 hyperprivop to reduce context switch
overhead.

Linux/ia64 changes region registers from rr0 to rr4 when context switch
so that XenLinux issues 5 set_rr hyperprivops.
This patch introduces the hyperprivops to change and reduce the cost
to about 1/4 - 1/5. This rage is very reasonable because its overhead
comes from hypercall trap cost.

[PATCH 1/2][RFC] set rr0 to rr4 hyperprivop: Xen side
[PATCH 2/2][RFC] set rr0 to rr4 hyperprivop: Linux side
    
thanks,

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