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

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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