127 lines
2.4 KiB
C
Executable File
127 lines
2.4 KiB
C
Executable File
/*
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* The following program is used to generate the constants for
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* computing sched averages.
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*
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* ==============================================================
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* C program (compile with -lm)
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* ==============================================================
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*/
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#include <math.h>
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#include <stdio.h>
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#define HALFLIFE { 32, 16, 8 }
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#define SHIFT 32
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double y;
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void calc_runnable_avg_yN_inv(const int halflife)
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{
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int i;
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unsigned int x;
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printf("static const u32 runnable_avg_yN_inv[] = {");
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for (i = 0; i < halflife; i++) {
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x = ((1UL<<32)-1)*pow(y, i);
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if (i % 4 == 0) printf("\n\t");
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printf("0x%8x,", x);
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}
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printf("\n};\n\n");
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}
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int sum;
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void calc_runnable_avg_yN_sum(const int halflife)
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{
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int i;
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printf("static const u32 runnable_avg_yN_sum[] = {\n\t 0,");
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for (i = 1; i <= halflife; i++) {
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if (i == 1)
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sum *= y;
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else
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sum = sum*y + 1024*y;
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if (i % 11 == 0)
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printf("\n\t");
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printf("%5d,", sum);
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}
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printf("\n};\n\n");
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}
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int n;
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long max;
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void calc_converged_max(const int halflife)
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{
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long last = 0, y_inv = ((1UL<<32)-1)*y;
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for (; ; n++) {
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if (n > -1)
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max = ((max*y_inv)>>SHIFT) + 1024;
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/*
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* This is the same as:
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* max = max*y + 1024;
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*/
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if (last == max)
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break;
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last = max;
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}
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n--;
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printf("#define LOAD_AVG_PERIOD %d\n", halflife);
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printf("#define LOAD_AVG_MAX %ld\n", max);
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printf("#define LOAD_AVG_MAX_N %d\n\n", n);
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}
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void calc_accumulated_sum_32(const int halflife)
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{
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int i, x = sum;
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printf("static const u32 __accumulated_sum_N32[] = {\n\t 0,");
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for (i = 1; i <= n/halflife+1; i++) {
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if (i > 1)
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x = x/2 + sum;
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if (i % 6 == 0)
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printf("\n\t");
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printf("%6d,", x);
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}
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printf("\n};\n\n");
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}
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void main(void)
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{
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int hl_value[] = HALFLIFE;
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int hl_count = sizeof(hl_value) / sizeof(int);
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int hl_idx, halflife;
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printf("/* SPDX-License-Identifier: GPL-2.0 */\n");
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printf("/* Generated by Documentation/scheduler/sched-pelt; do not modify. */\n");
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for (hl_idx = 0; hl_idx < hl_count; ++hl_idx) {
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halflife = hl_value[hl_idx];
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y = pow(0.5, 1/(double)halflife);
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sum = 1024;
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/* first period */
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max = 1024;
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n = -1;
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printf("\n#ifdef CONFIG_PELT_UTIL_HALFLIFE_%d\n", halflife);
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calc_runnable_avg_yN_inv(halflife);
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calc_runnable_avg_yN_sum(halflife);
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calc_converged_max(halflife);
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/*
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* calc_accumulated_sum_32(halflife) precomputed load sum table of half-life,
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* not used yet.
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*/
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printf("#endif\n");
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}
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}
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