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[PATCH] sched: document prio_to_wmult[]

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document prio_to_wmult[].

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2007-07-16 09:46:31 +02:00
parent f9153ee6c7
commit 5714d2de93
1 changed files with 7 additions and 0 deletions
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7
kernel/sched.c
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@ -748,6 +748,13 @@ static const int prio_to_weight[40] = {
/* 10 */ 110, 87, 70, 56, 45, 36, 29, 23, 18, 15, /* 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] = { static const u32 prio_to_wmult[40] = {
48356, 60446, 75558, 94446, 118058, 147573, 48356, 60446, 75558, 94446, 118058, 147573,
184467, 230589, 288233, 360285, 450347, 184467, 230589, 288233, 360285, 450347,