Re: [patch 00/11] ANNOUNCE: "Syslets", generic asynchronous systemcall support

[Davide Libenzi]

On Tue, 13 Feb 2007, Davide Libenzi wrote:

[...]

> So the sys_async_exec task is going to block. Now, am I being really 
> tired, or the cachemiss fast return is simply not there?

The former 8)

pick_new_async_head()
	new_task->ah = ah;

cachemiss_loop()
	for (;;) {
		if (unlikely(t->ah || ...))
			break;


> There's another problem AFAICS:
> 
> - We woke up one of the cachemiss_loop threads in pick_new_async_thread
> 
> - The threads wakes up, mark itself as busy, and look at the ->work 
>   pointer hoping to find something to work on
> 
> But we never set that pointer to a userspace atom AFAICS. Me blind? :)

I still don't see at->work ever set to a valid userspace atom though...



- Davide


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