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Commit f9153ee6 authored by Ingo Molnar's avatar Ingo Molnar
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[PATCH] sched: improve weight-array comments 



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: default avatarIngo Molnar <mingo@elte.hu>
parent 5926c50b

kernel/sched.c

+3 −1
Original line number Diff line number Diff line
@@ -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,

 * 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] = {

/* -20 */ 88818, 71054, 56843, 45475, 36380, 29104, 23283, 18626, 14901, 11921,