Re: [RFC] sched: implement the exclusive wait queue as a LIFO queue

[Yong Zhang <yong.zhang@windriver.com>]

On Wed, Apr 28, 2010 at 03:52:01PM +0800, Changli Gao wrote:
> On Wed, Apr 28, 2010 at 3:47 PM, Xiaotian Feng <xtfeng@gmail.com> wrote:
> > On Wed, Apr 28, 2010 at 1:03 PM, Changli Gao <xiaosuo@gmail.com> wrote:
> >> implement the exclusive wait queue as a LIFO queue
> >>
> >> If the exclusive wait queue is also a LIFO queue as the normal wait queue, the
> >> process who goes to sleep recently, will be woke up first. As its memory is
> >> more likely in cache, we will get better performance. And when there are many
> >> processes waiting on a exclusive wait queue, some of them may not be woke up,
> >> if the others can handle the workload, and it will reduce the load of
> >> the scheduler.
> >>
> >
> > Starve some processes for performance?
> >
> 
> Starve? Oh, No. If we don't need these processes, and we can do better

What do you mean "we don't need these processes"?

> without them, why we wake them up?

So some processs(at the tail of exclusive list)will be treated abnormally
and it will sleep for a long time, is this reasonable?

> 
> 
> -- 
> Regards，
> Changli Gao(xiaosuo@gmail.com)
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