Scott Long wrote:
> Nikhil Dharashivkar wrote:
>> i want to hack the ktrace system call. Basically, I want to monitor
>> scsi disk IO through dastrategy() routine.
>> It seems that kern_ktrace.c implements different functions for
>> ktrace options like -tc / -ti ... etc (see man page). So, is it
>> possible to add new option for disk IO with new structure object
>> containing disk io information which will be pass to
>> ktr_submittrequest thr' ktr_request structure.
>> Will data will be written correctly in ktrace.out and will
>> kdump analyze that ?
> What are you trying to monitor? Would the existing devstat interface
May be he requires how many bytes transferred (read/write) while a
process is executing.
I guess devstat doesn't do it from process context, it gives total IO
read/writes from a device,
if registred via devstat. Please correct me if I am wrong.
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