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