use tmpfs (mergefs cannot be used for usdt tests, as st_dev becomes different between stat(2) and /proc/*/maps when the executable is stored in mergefs)
use tmpfs (mergefs cannot be used for usdt tests, as st_dev becomes different between stat(2) and /proc/*/maps when the executable is stored in mergefs)

yannick/h2o,cwyang/h2o,devnexen/h2o,cwyang/h2o,yannick/h2o,cwyang/h2o,yannick/h2o,h2o/h2o,cwyang/h2o,h2o/h2o,h2o/h2o,h2o/h2o,yannick/h2o,yannick/h2o,devnexen/h2o,devnexen/h2o,cwyang/h2o,devnexen/h2o,h2o/h2o,h2o/h2o,devnexen/h2o,devnexen/h2o,yannick/h2o,devnexen/h2o,h2o/h2o,yannick/h2o,devnexen/h2o,devnexen/h2o,yannick/h2o,cwyang/h2o,yannick/h2o,h2o/h2o,cwyang/h2o,cwyang/h2o,h2o/h2o