[PATCH] sched: document prio_to_wmult[]
document prio_to_wmult[].
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/sched.c b/kernel/sched.c
index a7284bc..90d22b7 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -748,6 +748,13 @@
/* 10 */ 110, 87, 70, 56, 45, 36, 29, 23, 18, 15,
};
+/*
+ * Inverse (2^32/x) values of the prio_to_weight[] array, precalculated.
+ *
+ * In cases where the weight does not change often, we can use the
+ * precalculated inverse to speed up arithmetics by turning divisions
+ * into multiplications:
+ */
static const u32 prio_to_wmult[40] = {
48356, 60446, 75558, 94446, 118058, 147573,
184467, 230589, 288233, 360285, 450347,
