Re: report a bug about sched_rt

sen wang
2009-07-24T13:44:47Z

2009/7/24 Peter Zijlstra <peterz@infradead.org>:
> On Fri, 2009-07-24 at 21:26 +0800, sen wang wrote:
>> don't tell me what theory. don't be so doctrinairism! OK?
>> If cpu is free and there is a running state task,how can you scdedule
>> idle task up?
>> I tell you again:we are not talking about a bandwidth of 100% for RT!
>> Bug lies in the bandwidth of (100- X)%.(X<100)
>> even in the time of 100-X,if there is a rt task, you should not idle()
>> the system.
>
> *sigh*
>
> Yes we should. I appreciate that you might assume otherwise, but you're
> wrong. Suppose you have two competing bandwidth groups, which one will
> run over, to what purpose?
>
> Also, your next top post will go to /dev/null.
>

OK ! maybe you has not understand what I said.
It not two competing bandwidth groups. there is a active group and
another is empty?
How you do?
Why not try it by your hand: empty the fair task, run a rt task,enable
the bandwidth and
see what will happen!

In many embedded system,idle task will lead to shutdown something, but
the rt task will
assume: when it run, idle will not happen!