Re: [Xen-devel] Detecting deadlocks with hypervisor..

[Randy Thelen <rthelen@xxxxxxxxxx>]

Thileepan Subramaniam wrote:

> Can someone help me by explaining me what happens behind the scene  
> when "xm save" is called ? Is there any good documentation  
> explaining which actions are done by which layers (eg: python  
> layer, C layer etc).
This would be immensely valuable.  I imagine there's a college  
student looking for some way to make their mark in the open source  
community.
> Also, does it seem viable to clone a copy of a deadlocked guest OS  
> in the first place?
The idea of using clones as a way of detecting deadlocks is intriguing.

> I am trying to see if the hypervisor can be used to detect  
> deadlocks in the guest VMs. My goal is to detect if a guest OS is  
> deadlocked, and if it is, then create a clone of the deadlocked OS  
> without the locking condition, and letting the clone run. While the  
> clone runs I am hoping to generate some hints that could tell me  
> what caused the deadlock.
But, I suspect that some logic injected into the lock routines (and  
data structures) of the host O/S are an easier and possibly better bet.
-- Randy Thelen

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