RSE Behavior on Interruptions

RSE Behavior on Interruptions

[Zoltan Menyhart]

Let's assume a user program just has been interrupted.
The RSE can continue spilling/filling registers on behalf of the interrupted user.
Let's assume the RSE engine touches a swapped out page.
As PSR.ic is 0, the page fault cannot be captured correctly.

Can this scenario happen to the current Linux kernel implementation?

Thanks,

Zoltan Menyhart

Re: RSE Behavior on Interruptions

[Matthew Chapman]

Hi Zoltan,

The architecture defines that only mandatory (Þmand) RSE accesses can
fault, background RSE activity never raises faults - see SDM II.6.6.

(In any case, current processors don't implement eager mode, so RSE
accesses are only done on demand anyway...)

Matt


On Mon, Feb 18, 2008 at 02:32:10PM +0100, Zoltan Menyhart wrote:
> Let's assume a user program just has been interrupted.
> The RSE can continue spilling/filling registers on behalf of the 
> interrupted user.
> Let's assume the RSE engine touches a swapped out page.
> As PSR.ic is 0, the page fault cannot be captured correctly.
> 
> Can this scenario happen to the current Linux kernel implementation?
> 
> Thanks,
> 
> Zoltan Menyhart
> 
> -
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