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SubjectRe: workqueue deadlock
On Thu, Dec 07, 2006 at 11:47:01AM +0530, Srivatsa Vaddagiri wrote:
> - Make it rw-sem

I think rw-sems also were shown to hit deadlocks (recursive read-lock
attempt deadlocks when a writer comes between the two read attempts by the same
thread). So below suggestion only seems to makes sense ..

> - Make it per-cpu mutex, which could be either:
> - Ingo's suggestion
> - Gautham's work based on RCU
> In Ingo's suggestion, I really dont know if the task_struct
> modifications is a good thing (to support recursive requirements).
> Gautham's patches avoid modifications to task_struct, is fast but can
> starve writers (who want to bring down/up a CPU).

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