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[PATCH] sched: improve weight-array comments

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improve the comments around the wmult array (which controls the weight
of niced tasks). Clarify that to achieve a 10% difference in CPU
utilization, a weight multiplier of 1.25 has to be used.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2007-07-16 09:46:30 +02:00
parent 5926c50b83
commit f9153ee6c7
1 changed files with 3 additions and 1 deletions
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4
kernel/sched.c
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@ -736,7 +736,9 @@ static void update_curr_load(struct rq *rq, u64 now)
* *
* The "10% effect" is relative and cumulative: from _any_ nice level, * The "10% effect" is relative and cumulative: from _any_ nice level,
* if you go up 1 level, it's -10% CPU usage, if you go down 1 level * if you go up 1 level, it's -10% CPU usage, if you go down 1 level
* it's +10% CPU usage. * it's +10% CPU usage. (to achieve that we use a multiplier of 1.25.
* If a task goes up by ~10% and another task goes down by ~10% then
* the relative distance between them is ~25%.)
*/ */
static const int prio_to_weight[40] = { static const int prio_to_weight[40] = {
/* -20 */ 88818, 71054, 56843, 45475, 36380, 29104, 23283, 18626, 14901, 11921, /* -20 */ 88818, 71054, 56843, 45475, 36380, 29104, 23283, 18626, 14901, 11921,