On 2/20/20 9:08 PM, Douglas Gilbert wrote: > Add a new command line option (e.g. random=1) and sysfs attribute > that causes subsequent command completion times to be between the > current command delay setting and 0. A unformily distributed 32 > bit, kernel provided integer is used for this purpose. > > Since the existing 'delay' whose units are jiffies (typically > milliseconds) and 'ndelay' (units: nanoseconds) options (and sysfs > attributes) span a range greater than 32 bits, some scaling is > required. > > The purpose of this patch is to widen the range of testing cases > that are visited in long running tests. Put simply: rarely struct > race conditions are more likely to be found when this facility is > used. > > The default is the previous case in which all command completions > were roughly equal to (if not, slightly longer) than the value > given by the 'delay' or 'ndelay' settings (or their defaults). > This option's default is equivalent to setting 'random=0' . > > Signed-off-by: Douglas Gilbert <dgilbert@xxxxxxxxxxxx> > --- > drivers/scsi/scsi_debug.c | 42 ++++++++++++++++++++++++++++++++++++--- > 1 file changed, 39 insertions(+), 3 deletions(-) > Reviewed-by: Hannes Reinecke <hare@xxxxxxx> Cheers, Hannes -- Dr. Hannes Reinecke Kernel Storage Architect hare@xxxxxxx +49 911 74053 688 SUSE Software Solutions Germany GmbH, Maxfeldstr. 5, 90409 Nürnberg HRB 36809 (AG Nürnberg), GF: Felix Imendörffer
