Re: [Xen-devel] domain_pause and vcpu_pause on currently executing domain?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 18 Jul 2005, at 21:55, George Washington Dunlap III wrote:

> We're using basically the exact same functionality, with a 
> pause/unpause "counter" rather than a bit, with our execution replay 
> system.  In our current implementation, there are a number of 
> different threads of the replay system, each doing a small set of 
> things: one is delivering interrupts, doing scheduling, etc.; but we 
> have separate threads called "replay drivers" which sit between the 
> replaying domain and the thing they're talking to.   All of these 
> competeing interests want to pause and unpause the domain, and having 
> just a bit isn't enough.
> But I'd naturally rather use mainline xen functionality, than maintain 
> my own copy, if I can.
{domain,vcpu}_pause are based on a counter, not a bit. These are what 
you can call from within Xen, so if that is where you are implementing 
stuff you shouldn't need your own functions.
domain_pause_by_systemcontroller(), which is what is accessible from 
outside Xen itself, is based on a single bit.
 -- Keir


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