Re: [Xen-devel] [PATCH] Add SCHEDOP_block_on

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 11 Mar 2006, at 14:17, John Levon wrote:

> > > This would work (I think), but it's rather unpleasant to say the 
> > > least.
> > I'd rather have an unpleasant hack in the bowels of your debugger than
> > an unpleasant additional interface in Xen that noone else will use. 
> > :-)
> Then we have no choice but to misuse the interfaces you're prepared to
> provide. Oh well.
I had some more of a think about this and actually there is a case for 
using a polling interface of this type in the pcifront driver. That 
sends a PCI-config-space request to the backend driver while it has 
interrupts disabled and currently has to spin on a software flag. At 
least the spin is usually short, but it's not a nice thing to have to 
do.
I'll have another look at your patch next week and reconsider.

 -- Keir


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