+-AFs-Linux-ia64+-AF0- reader-writer livelock proble
Quoted 9 lines · David Mosberger
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Quoted 1 line · Kevin
Van> I have not looked at this, but I don't believe it is the right Van> way to solve the problem: users who _need_ to use all Van> the CPUs for computation would be punished just to work around Van> a kernel implementation issue: that's like saying don't allow Van> processes to allocate virtual memory because if the VM is Van> over-committed by X amount the kernel deadlocks.
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Van> It would be a bad hack to limit the system-call rate just to Van> prevent livelock.
Certainly. I didn't suggest PRM as a way to _solve_ the livelock problem, but since Mario asked for a method to cap CPU utilization, I mentiond it.
--david
Absolutelly its not a method to solve the problem. As a matter of fact its just a first approach that came to mind to protect the system. It could be any other viable way before a final fix.
Like I said in the previous email you're not going to sell too many high end servers to a customer aware of this issue without a contingency plan.
- Mario.