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?
Ingo
Rogan
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