Re: [REPORT] cfs-v4 vs sd-0.44

From: Rogan Dawes
Date: Tue Apr 24 2007 - 03:06:19 EST

Ingo Molnar wrote:

static void
yield_task_fair(struct rq *rq, struct task_struct *p, struct task_struct *p_to)
struct rb_node *curr, *next, *first;
struct task_struct *p_next;

* yield-to support: if we are on the same runqueue then
* give half of our wait_runtime (if it's positive) to the other task:
if (p_to && p->wait_runtime > 0) {
p->wait_runtime >>= 1;
p_to->wait_runtime += p->wait_runtime;

the above is the basic expression of: "charge a positive bank balance".


[note, due to the nanoseconds unit there's no rounding loss to worry about.]

Surely if you divide 5 nanoseconds by 2, you'll get a rounding loss?


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