Re: [RFC] [PATCH] Pre-emption control for userspace

[Oleg Nesterov]

On 03/05, Andi Kleen wrote:
>
> On Wed, Mar 05, 2014 at 03:54:20PM +0100, Oleg Nesterov wrote:
> > On 03/04, Andi Kleen wrote:
> > >
> > > Anything else?
> >
> > Well, we have yield_to(). Perhaps sys_yield_to(lock_owner) can help.
> > Or perhaps sys_futex() can do this if it knows the owner. Don't ask
> > me what exactly I mean though ;)
>
> You mean yield_to() would extend the time slice?
>
> That would be the same as the mmap page, just with a syscall right?

Not the same. Very roughly I meant something like

	my_lock()
	{
		if (!TRY_LOCK()) {
			yield_to(owner);
			LOCK();
		}

		owner = gettid();
	}

But once again, I am not sure if this makes any sense.

Oleg.

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