On 04/06/2010 10:31 PM, Thomas Gleixner wrote:
quoted text
>
>> That gives you something along the lines of
>>
>> 	runaddr = find_run_flag(lock);
>> 	do {
>> 		while(*runaddr == RUNNING) {
>> 			if (trylock(lock))
>> 				return WHOOPEE;
>> 			cpu relax
>> 		}
>> 		yield (_on(thread));
>>      
> That would require a new yield_to_target() syscall, which either
> blocks the caller when the target thread is not runnable or returns an
> error code which signals to go into the slow path.
>    

Note, directed yield is something that kvm wants for its own ends.  As 
an internal kernel api, not a syscall, but it's apparently useful.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

--
unsubscribe notice
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/