Re: [patch] Real-Time Preemption, -VP-2.6.9-rc4-mm1-U0

[Robert Wisniewski]

Theoretically a problem, in practice not, i.e., good enough for soft/normal
real-time, not hard real-time; probably wouldn't want my heart monitor on
it, but then I wouldn't be using Linux for that either :-)

Robert Wisniewski
The K42 MP OS Project
Advanced Operating Systems
Scalable Parallel Systems
IBM T.J. Watson Research Center
914-945-3181
http://www.research.ibm.com/K42/
bob@xxxxxxxxxxxxxx


Roland Dreier writes:
 >     Karim> cmpxchg (basically: try reserve; if fail retry; else
 >     Karim> write), with per-cpu buffers.
 > 
 > Not sure if I really understand the context where Ingo would use this,
 > but this lockless scheme doesn't seem to be safe for realtime; the
 > retry can potentially happen an arbitrary number of times.
 > 
 >  - Roland
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