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Hi,
In my driver I store pointers to
the task_struct structures of several user processes. When some event occurs, I
need a way to tell which one of these processes was running most recently.
Can it be done by looking at some task_struct
fields? Below are the details :
I am writing a driver for the VME
bus . The
driver has a mmap entry point that let user processes mmap()
portion of the VME space. I have to plan for when these accesses will end in a
bus error. I want to
make sure that user processes that generates VME bus error
are killed. The problem I have is that VME writes
accesses are write posted in a transmit FIFO of the VME controller. In the case
where a write-posted VME cycle ends in a bus error, and interrupt is raised to
tell the CPU of that event. Also, the vme fault address is stored in the
controller. In my interrupt handler I need to send a termination signal to the
offending process. But by the time I get the interrupt, I can't assume
that the
currently running process is the offending process, because
of the FIFO effect.
So the problem is that I have to go
thru all the processes which mmaping includes th e fault y
address. So far so good (I keep a list of all these mmapings in my driver). But
there is a problem when several processes mmap the same fault address. In
that case I need a way to tell what process was running most recently, so that I
can kill it. That is what we do under Solaris, and it works
fine.
Any ideas?
Thanks a lot,
-jean-francois
simon
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