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| author | Alex Bennée <alex.bennee@linaro.org> | 2019-05-29 17:16:32 +0100 |
|---|---|---|
| committer | Alex Bennée <alex.bennee@linaro.org> | 2019-06-12 17:53:22 +0100 |
| commit | 50290c002c045280f8defad911901e16bfb52884 (patch) | |
| tree | c432853313b60bfe43c5fe6db27756d847ccd1bf /scripts/render_block_graph.py | |
| parent | 9b109f566adff4d394806b046b395363e523bd80 (diff) | |
| download | qemu-50290c002c045280f8defad911901e16bfb52884.zip qemu-50290c002c045280f8defad911901e16bfb52884.tar.gz qemu-50290c002c045280f8defad911901e16bfb52884.tar.bz2 | |
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>
Diffstat (limited to 'scripts/render_block_graph.py')
0 files changed, 0 insertions, 0 deletions