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Message-ID: <4488B233.6050409@cn.ibm.com>
Date: Thu, 08 Jun 2006 23:26:00 -0000
From: Li Guanglei <guanglei@cn.ibm.com>
Organization: IBM CSTL
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To: Alan David Brunelle <Alan.Brunelle@hp.com>
CC: systemtap@sourceware.org
Subject: Re: Probing symbols that are not EXPORT()ed
References: <44885B41.5020501@hp.com>
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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