Tyler Trafford wrote:
On Fri, Sep 09, 2005 at 01:25:51PM -0400, Paul Koster wrote:
These logs are quite similar to my situation since I upgraded
Sep 2 18:23:46 pvr kernel: ivtv: ==================== START INIT IVTV
====================
Sep 2 18:23:46 pvr kernel: ivtv: version 0.3.8 ((svn snapshot revision
1280)) loading
Sep 2 18:23:46 pvr kernel: ivtv: Linux version: 2.6.8 preempt
PENTIUMIII gcc-3.3
I don't remember if ivtv is PREEMPT-safe. Chris?
Well I've heard it isn't, not first hand but seems like there's problems
there for some with preemtable kernels. I think there's alot of places
that we have tricky situations for SMP and preemptable kernels which is
why I don't doubt there would be problems, although I really think it's
just preemptable kernels and not SMP, probably we need to disable
preemption in alot of parts of the driver from need of linear things for
keeping this hardware happy.
I think in this case of running out of memory and preemption, possibly a
place we need to disable preemption or do something different, although
mostly it's just a memory situation although not locking up there in
*most* cases I've seen (but not on preemption, so why I think you may be
exactly right in what I think your thinking about preemption causing the
lockup :-).
Thanks,
Chris
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