When a process is doing Random Write with O_DSYNC flag
 the I/O wait are not accounted in the kernel (get_cpu_iowait_time_us).
 This is preventing the governor or the cpufreq driver to account for
 I/O wait and thus use the right pstate
Signed-off-by: NStephane Gasparini <stephane.gasparini@linux.intel.com>
Signed-off-by: NPhilippe Longepe <philippe.longepe@linux.intel.com>
Signed-off-by: NJens Axboe <axboe@fb.com>