The following command creates a snapshot every time a block request
queue is unplugged with a depth > 1. If you were tracing a set of
events or functions at the time, the snapshot trace buffer would
- capture those events when the trigger event occured:
+ capture those events when the trigger event occurred:
# echo 'snapshot if nr_rq > 1' > \
/sys/kernel/debug/tracing/events/block/block_unplug/trigger