[PATCH 0/4] improve alternative instruction code and optimizeget_cycles_sync

[Joerg Roedel]

This series of patches extend the alternative instructions framework on
i386 and x86_64 architectures to support two alternative instruction
replacements. This code is used together with the introduction of the
X86_FEATURE_SYNC_RDTSC flag on i386 to simplify and optimize the
get_cycles_sync() function. The optimization changes this function to
use RDTSCP instead of CPUID;RDTSC if this instruction is available.
Don't use CPUID there is really important if the kernel runs as a KVM
guest, because this instruction is intercepted and causes an expensive
VMEXIT.

-- 
Joerg Roedel
Operating System Research Center
AMD Saxony LLC & Co. KG


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