selftests/powerpc: Count more instructions & use decimal
Although we expect some small discrepancies for very large counts, we
seem to be able to count up to 64 billion instructions without too much
skew, so do so.
Also switch to using decimals for the instruction counts. This just
makes it easier to visually compare the expected vs actual values, as
well as the raw result from instructions.
Before:
instructions: result
68719476753 running/enabled
13101961654
cycles: result
38077343785 running/enabled
13101725752
Looped for
68719476736 instructions, overhead 17
Expected
68719476753
Actual
68719476753
Delta 0, 0.000000%
success: count_instructions
After:
instructions: result
64000000016 running/enabled
12197599964
cycles: result
35412471674 running/enabled
12197534110
Looped for
64000000000 instructions, overhead 16
Expected
64000000016
Actual
64000000016
Delta 0, 0.000000%
success: count_instructions
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>