Re: [PATCH 14/15] sched_ext: scx_qmap: Add proxy execution support

[Andrea Righi]

On Mon, Aug 03, 2026 at 12:22:27PM -1000, Tejun Heo wrote:
> On Tue, Jul 28, 2026 at 05:43:32PM +0200, Andrea Righi wrote:
> > +	 * A blocked donor rejected by a local DSQ must not be dispatched back
> > +	 * to the same DSQ immediately. Move it to the global DSQ so another CPU
> > +	 * can pick it up and kick an idle cid to accelerate its consumption.
> 
> My mental picture isn't complete. Can you expand on why this block is
> necessary?

This was intended to support SCX_OPS_ALWAYS_ENQ_IMMED. A blocked donor is
inserted into a local DSQ, but if the donor can't run immediately, it goes back
to ops.enqueue() when ENQ_IMMED is set. Maybe we can move this condition in the
main SCX_ENQ_REENQ block at the top (explaining this special case with proxy
exec)?

-Andrea