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xen-devel
Re: [Xen-devel] Diagnose stuff
On 25/03/2009 08:24, "Juergen Gross" <juergen.gross@xxxxxxxxxxxxxxxxxxx>
wrote:
> while implementing cpupool support in XEN I had to track down some issues
> with deadlocks. Is there any interest in patches for the following?
>
> - compile time switchable spinlock timeout detection
NMI watchdog support effectively gets us this, and more general deadlock
detection. Just put 'watchdog' on Xen's command line.
> - printout of state of ALL cpus to console in case of hypervisor crash
Not sure how useful this would be really for most crashes. Probably we don't
want it.
> - some enhancements in lock handling to reduce (potential) latency:
> Today in *lock_irq and *lock_irqsave interrupts are disabled and then
> spinning is started. If the lock is not obtained, enabling and disabling of
> IRQs in the spinloop would block IRQs as short as possible.
Could do. I don't think our IRQ locks are very contended, but equally I
suppose the patch is only a few lines.
-- Keir
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