Oliver Neukum wrote:
IMHO USB is the unusual case because it is a bus and a tree. A generic locking model probably has to lock the whole bus. Or of course, on a higher level. Is there enough contention that a global lock would be impractical?
A generic model has to understand that any computer nowadays is built from a tree of busses ... just like USB is built from a tree of hubs. Trees are the _normal_ case.
Contention is curious; something like dpm_sem wouldn't really be high-contention if it weren't trying to protect the power lists. The problem there is that lock tries to protect too much, with resulting self-deadlocks.
- Dave
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