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qemu-io-cmds: use clock_gettime for benchmarking
The previous use of gettimeofday() ran into undefined behaviour when we ended up doing a div 0 for a very short operation. This is because gettimeofday only works at the microsecond level as well as being prone to discontinuous jumps in system time. Using clock_gettime with CLOCK_MONOTONIC gives greater precision and alleviates some of the potential problems with time jumping around. We could use CLOCK_MONOTONIC_RAW to avoid being tripped up by NTP and adjtime but that is Linux specific so I decided it would do for now. Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
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