V7 High CPU Usage on swi5:+, what is this process?

[Robert Watson]

On Tue, 18 Mar 2008, John Baldwin wrote:

>> '+' is used in a swi name to indicate that the names of the interrupts to 
>> put in the thread name are too long, and the code looks like it was written 
>> under the assumption that at least one name would fit.  It sounds like in 
>> this case, none fit.  We should fix this code, but in the mean time, what 
>> you might consider doing is hacking intr_event_update() in kern_intr.c to 
>> print out overflowing names to the console using printf(9) so you can at 
>> least see what they are.  This is the somewhat suspect bit of code:
>
> The code is not suspect as p_comm is of fixed length.  Someone just used too 
> long of a name for a swi handler.

I was wondering whether we might not do better to put as much in as we can but 
truncate with a '*', so you at least get a fractional swi name.  Under what 
situations do we use a single ithread for multiple swi's?

Robert N M Watson
Computer Laboratory
University of Cambridge