Is In IO scheduler add_request and dispatch_request asynchronous or synchronous??

[韩磊]

Is In IO scheduler add_request and dispatch_request asynchronous or
synchronous??

In kernel,add request and dispatch request is  asynchronous or synchronous?
" __make_request"  first do add,then do dispatch,is right?

Does Add request and dispatch request have each other's thread???


Thank you!
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