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Trace events like scsi_dispatch_cmd_start and scsi_dispatch_cmd_done are useful for tracking a command throughout its lifetime. But for some ATA passthrough commands, the information printed in current logs is not enough to identify and match them. For example, if two threads send SMART cmd to the same disk at the same time, their trace logs may look the same, which makes it hard to match scsi_dispatch_cmd_done and scsi_dispatch_cmd_start. Printing tags can help us solve the problem. Further, if a command failed for some reason and then is retried, its driver_tag will change. So scheduler_tag is also included such that we can track the retries of a command. Link: https://lore.kernel.org/r/20220621181125.3211399-1-changyuanl@google.com Reviewed-by: Vishakha Channapattan <vishakhavc@google.com> Reviewed-by: Jolly Shah <jollys@google.com> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Changyuan Lyu <changyuanl@google.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> |
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| .. | ||
| events | ||
| stages | ||
| bpf_probe.h | ||
| define_custom_trace.h | ||
| define_trace.h | ||
| perf.h | ||
| syscall.h | ||
| trace_custom_events.h | ||
| trace_events.h | ||