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 /* To silence -Wunused-but-set-variable warnings. */ 24 printf("static const u32 runnable_avg_yN_inv[] __maybe_unused = {"); 25 for (i = 0; i < HALFLIFE; i++) { 26 x = ((1UL<<32)-1)*pow(y, i); 27 28 if (i % 6 == 0) 29 printf("\n\t"); 30 printf("0x%8x, ", x); 31 } 32 printf("\n};\n\n"); 33 } 34 35 int sum = 1024; 36 37 void calc_runnable_avg_yN_sum(void) 38 { 39 int i; 40 41 printf("static const u32 runnable_avg_yN_sum[] = {\n\t 0,"); 42 for (i = 1; i <= HALFLIFE; i++) { 43 if (i == 1) 44 sum *= y; 45 else 46 sum = sum*y + 1024*y; 47 48 if (i % 11 == 0) 49 printf("\n\t"); 50 51 printf("%5d,", sum); 52 } 53 printf("\n};\n\n"); 54 } 55 56 int n = -1; 57 /* first period */ 58 long max = 1024; 59 60 void calc_converged_max(void) 61 { 62 long last = 0, y_inv = ((1UL<<32)-1)*y; 63 64 for (; ; n++) { 65 if (n > -1) 66 max = ((max*y_inv)>>SHIFT) + 1024; 67 /* 68 * This is the same as: 69 * max = max*y + 1024; 70 */ 71 72 if (last == max) 73 break; 74 75 last = max; 76 } 77 n--; 78 printf("#define LOAD_AVG_PERIOD %d\n", HALFLIFE); 79 printf("#define LOAD_AVG_MAX %ld\n", max); 80 // printf("#define LOAD_AVG_MAX_N %d\n\n", n); 81 } 82 83 void calc_accumulated_sum_32(void) 84 { 85 int i, x = sum; 86 87 printf("static const u32 __accumulated_sum_N32[] = {\n\t 0,"); 88 for (i = 1; i <= n/HALFLIFE+1; i++) { 89 if (i > 1) 90 x = x/2 + sum; 91 92 if (i % 6 == 0) 93 printf("\n\t"); 94 95 printf("%6d,", x); 96 } 97 printf("\n};\n\n"); 98 } 99 100 void main(void) 101 { 102 printf("/* Generated by Documentation/scheduler/sched-pelt; do not modify. */\n\n"); 103 104 y = pow(0.5, 1/(double)HALFLIFE); 105 106 calc_runnable_avg_yN_inv(); 107 // calc_runnable_avg_yN_sum(); 108 calc_converged_max(); 109 // calc_accumulated_sum_32(); 110 } 111