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SubjectRe: [PATCH 2 of 4] Introduce i386 fibril scheduling
On Tue, 30 Jan 2007, Zach Brown wrote:

> + /*
> + * XXX The idea is to copy all but the actual call stack. Obviously
> + * this is wildly arch-specific and belongs abstracted out.
> + */
> + *next->ti = *ti;
> + *thread_info_pt_regs(next->ti) = *thread_info_pt_regs(ti);

arch copy_thread_info()?



> + current->per_call = next->per_call;

Pointer instead of structure copy? percall_clone()/percall_free()?



> + /* always switch to a runnable fibril if we aren't being preempted */
> + if (unlikely(!(preempt_count() & PREEMPT_ACTIVE) &&
> + !list_empty(&prev->runnable_fibrils))) {
> + schedule_fibril(prev);
> + /*
> + * finish_fibril_switch() drops the rq lock and enables
> + * premption, but the popfl disables interrupts again. Watch
> + * me learn how context switch locking works before your very
> + * eyes! XXX This will need to be fixed up by throwing
> + * together something like the prepare_lock_switch() path the
> + * scheduler does. Guidance appreciated!
> + */
> + local_irq_enable();
> + return;
> + }

Yes, please (prepare/finish) ... ;)



- Davide


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