All:
I have been diagnosing kernel panics for over a week and I have
concerns with the use of tq_scheduler for which I was hoping I
could get some assistance.
Is it considered acceptable for functions in the tq_scheduler
task list to call schedule? Is it acceptable for such functions
to wait on wait queues? What limitations exist?
As near as I can determine, the TTY driver code makes use of
the tq_scheduler list for such purposes.
In my testing, I am running with 96 TTY devices (talking to a
high-density modem card) and I consistently achieve kernel panics
when the system is under heavy swapping. I am continuing to
diagnose the problem. The kernel panics are triggered mostly in
goodness() and del_from_runqueue(), as indicated by ksym_oops and
gdb, and I suspect the run queue is getting corrupted.
In spite of this testing, I believe that I have an argument against
tq_scheduler functions waiting on wait queues, but I have not
thoroughly convinced myself that (a) this was not already known,
and (b) this is already happening in existing kernel code.
Any help is greatly appreciated.
-art
Arthur Naseef
P.S. If this information is availed through existing documentation,
searches, or other widely available resources, I would greatly
appreciate references to this material. All of my searches to
date have yielded few results and nothing definitive.
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