X86-64 vsyscall is removed from Linux kernel 3.1.

H.J. Lu hjl.tools@gmail.com
Wed Aug 24 15:08:00 GMT 2011


Hi,

X86-64 vsyscall has been removed from Linux kernel 3.1 and
has been emulated with syscall instruction.  So for kernel 3.1
and above, vsyscall is slower than direct syscall instruction.
I think glibc should try vdso first and fall back to direct syscall
instruction.

-- 
H.J.



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