Probing symbols that are not EXPORT()ed

[Li Guanglei]

Alan David Brunelle ??:

> global rqs
> 
> probe kernel.function("scsi_dispatch_cmd")
> {
>        rqs <<< $cmd->request_bufflen
> }
> 
> Alan

There is already a probe alias defined in Systemtap for this.

/usr/share/systemtap/tapsets/scsi.stp:

...
/* Dispatch a command to the low-level driver. */
probe scsi.iodispatching
         = module("*").function("scsi_dispatch_cmd@drivers/scsi/scsi.c")
{

         host_no = $cmd->device->host->host_no
         channel = $cmd->device->channel
         lun = $cmd->device->lun
         dev_id = $cmd->device->id
         device_state = $cmd->device->sdev_state
         data_direction = $cmd->sc_data_direction
         request_buffer = $cmd->request_buffer
         req_bufflen = $cmd->request_bufflen
}
...

And this alias also have some predefined variables for you to use.

- Guanglei