mirror of https://github.com/schoebel/mars
79 lines
1.5 KiB
C
79 lines
1.5 KiB
C
// (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG
|
|
// (c) 2012 Thomas Schoebel-Theuer
|
|
|
|
//#define BRICK_DEBUGGING
|
|
//#define MARS_DEBUGGING
|
|
//#define IO_DEBUGGING
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
|
|
#include "mars.h"
|
|
#include "lib_rank.h"
|
|
|
|
void ranking_compute(struct rank_data *rkd, const struct rank_info rki[], int x)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; ; i++) {
|
|
int x0 = rki[i].rki_x;
|
|
int x1;
|
|
int y0;
|
|
int y1;
|
|
int points;
|
|
|
|
if (x0 == RKI_DUMMY)
|
|
break;
|
|
|
|
if (x < x0)
|
|
continue;
|
|
|
|
x1 = rki[i+1].rki_x;
|
|
|
|
if (x1 == RKI_DUMMY)
|
|
break;
|
|
|
|
y0 = rki[i].rki_y;
|
|
y1 = rki[i+1].rki_y;
|
|
|
|
// linear interpolation
|
|
points = ((long long)(x - x0) * (long long)(y1 - y0)) / (x1 - x0) + y0;
|
|
MARS_IO("i = %d x0 = %d x1 = %d y0 = %d y1 = %d points = %d\n", i, x0, x1, y0, y1, points);
|
|
rkd->rkd_tmp += points;
|
|
break;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(ranking_compute);
|
|
|
|
int ranking_select(struct rank_data rkd[], int rkd_count)
|
|
{
|
|
int res = -1;
|
|
long long max = LLONG_MIN / 2;
|
|
int i;
|
|
|
|
MARS_IO("rkd_count = %d\n", rkd_count);
|
|
|
|
for (i = 0; i < rkd_count; i++) {
|
|
struct rank_data *tmp = &rkd[i];
|
|
long long rest = tmp->rkd_current_points;
|
|
if (rest <= 0)
|
|
continue;
|
|
//rest -= tmp->rkd_got;
|
|
if (rest > max) {
|
|
max = rest;
|
|
res = i;
|
|
}
|
|
}
|
|
/* Prevent underflow in the long term
|
|
* and reset the "clocks" after each round of
|
|
* weighted round-robin selection.
|
|
*/
|
|
if (max < 0 && res >= 0) {
|
|
for (i = 0; i < rkd_count; i++)
|
|
rkd[i].rkd_got += max;
|
|
}
|
|
MARS_IO("res = %d\n", res);
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ranking_select);
|