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Normal single thread
   vdso: 25000000 times in 12.494133131 seconds
   libc: 25000000 times in 69.594625188 seconds
syscall: 25000000 times in 67.349243972 seconds
Time namespace single thread
   vdso: 25000000 times in 71.673057436 seconds
   libc: 25000000 times in 71.712774121 seconds
syscall: 25000000 times in 66.902318080 seconds

I'm seeing this on ppc, ppc64, and ppc64le.

Can you figure out what's going on and send a fix, which I'll squash
into this commit?

Jason

[1] https://git.zx2c4.com/linux-rng/commit/?h=jd/vdso-test-harness