1 /* 2 * The following program is used to generate the constants for 3 * computing sched averages. 4 * 5 * ============================================================== 6 * C program (compile with -lm) 7 * ============================================================== 8 */ 9 10 #include <math.h> 11 #include <stdio.h> 12 13 #define HALFLIFE 32 14 #define SHIFT 32 15 16 double y; 17 18 void calc_runnable_avg_yN_inv(void) 19 { 20 int i; 21 unsigned int x; 22 23 printf("static const u32 runnable_avg_yN_inv[] = {"); 24 for (i = 0; i < HALFLIFE; i++) { 25 x = ((1UL<<32)-1)*pow(y, i); 26 27 if (i % 6 == 0) printf("\n\t"); 28 printf("0x%8x, ", x); 29 } 30 printf("\n};\n\n"); 31 } 32 33 int sum = 1024; 34 35 void calc_runnable_avg_yN_sum(void) 36 { 37 int i; 38 39 printf("static const u32 runnable_avg_yN_sum[] = {\n\t 0,"); 40 for (i = 1; i <= HALFLIFE; i++) { 41 if (i == 1) 42 sum *= y; 43 else 44 sum = sum*y + 1024*y; 45 46 if (i % 11 == 0) 47 printf("\n\t"); 48 49 printf("%5d,", sum); 50 } 51 printf("\n};\n\n"); 52 } 53 54 int n = -1; 55 /* first period */ 56 long max = 1024; 57 58 void calc_converged_max(void) 59 { 60 long last = 0, y_inv = ((1UL<<32)-1)*y; 61 62 for (; ; n++) { 63 if (n > -1) 64 max = ((max*y_inv)>>SHIFT) + 1024; 65 /* 66 * This is the same as: 67 * max = max*y + 1024; 68 */ 69 70 if (last == max) 71 break; 72 73 last = max; 74 } 75 n--; 76 printf("#define LOAD_AVG_PERIOD %d\n", HALFLIFE); 77 printf("#define LOAD_AVG_MAX %ld\n", max); 78 // printf("#define LOAD_AVG_MAX_N %d\n\n", n); 79 } 80 81 void calc_accumulated_sum_32(void) 82 { 83 int i, x = sum; 84 85 printf("static const u32 __accumulated_sum_N32[] = {\n\t 0,"); 86 for (i = 1; i <= n/HALFLIFE+1; i++) { 87 if (i > 1) 88 x = x/2 + sum; 89 90 if (i % 6 == 0) 91 printf("\n\t"); 92 93 printf("%6d,", x); 94 } 95 printf("\n};\n\n"); 96 } 97 98 void main(void) 99 { 100 printf("/* Generated by Documentation/scheduler/sched-pelt; do not modify. */\n\n"); 101 102 y = pow(0.5, 1/(double)HALFLIFE); 103 104 calc_runnable_avg_yN_inv(); 105 // calc_runnable_avg_yN_sum(); 106 calc_converged_max(); 107 // calc_accumulated_sum_32(); 108 } 109