How hard would it be to have is-enabled kernel probes? While tracing scsi packets I can get lots of really good data by putting probes in scsi_transport() and scsi_hba_pkt_comp() as they contain the scsi packet. However the scsi_address that is available is opaque to all except the HBA and only available in a meaningful form by calling scsi_device_unit_address(). Clearly doing this when the probe is not enabled would be very expensive so having an is-enabled kernel probe would solve this.
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