Eric Lee / smarc-fsl-linux-kernel

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Documentation/scheduler/sched-pelt.c 1.95 KB
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76d034edc   Yuyang Du   sched/Documentati... 
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  /*
   * The following program is used to generate the constants for
   * computing sched averages.
   *
   * ==============================================================
   *		C program (compile with -lm)
   * ==============================================================
   */
  
  #include <math.h>
  #include <stdio.h>
  
  #define HALFLIFE 32
  #define SHIFT 32
  
  double y;
  
  void calc_runnable_avg_yN_inv(void)
  {
  	int i;
  	unsigned int x;
509466b7d   Qian Cai   sched/fair: Fix "... 
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  	/* To silence -Wunused-but-set-variable warnings. */
  	printf("static const u32 runnable_avg_yN_inv[] __maybe_unused = {");
76d034edc   Yuyang Du   sched/Documentati... 
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  	for (i = 0; i < HALFLIFE; i++) {
  		x = ((1UL<<32)-1)*pow(y, i);
  
  		if (i % 6 == 0) printf("
  \t");
  		printf("0x%8x, ", x);
  	}
  	printf("
  };
  
  ");
  }
  
  int sum = 1024;
  
  void calc_runnable_avg_yN_sum(void)
  {
  	int i;
  
  	printf("static const u32 runnable_avg_yN_sum[] = {
  \t    0,");
  	for (i = 1; i <= HALFLIFE; i++) {
  		if (i == 1)
  			sum *= y;
  		else
  			sum = sum*y + 1024*y;
  
  		if (i % 11 == 0)
  			printf("
  \t");
  
  		printf("%5d,", sum);
  	}
  	printf("
  };
  
  ");
  }
  
  int n = -1;
  /* first period */
  long max = 1024;
  
  void calc_converged_max(void)
  {
  	long last = 0, y_inv = ((1UL<<32)-1)*y;
  
  	for (; ; n++) {
  		if (n > -1)
  			max = ((max*y_inv)>>SHIFT) + 1024;
  			/*
  			 * This is the same as:
  			 * max = max*y + 1024;
  			 */
  
  		if (last == max)
  			break;
  
  		last = max;
  	}
  	n--;
  	printf("#define LOAD_AVG_PERIOD %d
  ", HALFLIFE);
  	printf("#define LOAD_AVG_MAX %ld
  ", max);
  //	printf("#define LOAD_AVG_MAX_N %d
  
  ", n);
  }
  
  void calc_accumulated_sum_32(void)
  {
  	int i, x = sum;
  
  	printf("static const u32 __accumulated_sum_N32[] = {
  \t     0,");
  	for (i = 1; i <= n/HALFLIFE+1; i++) {
  		if (i > 1)
  			x = x/2 + sum;
  
  		if (i % 6 == 0)
  			printf("
  \t");
  
  		printf("%6d,", x);
  	}
  	printf("
  };
  
  ");
  }
  
  void main(void)
  {
  	printf("/* Generated by Documentation/scheduler/sched-pelt; do not modify. */
  
  ");
  
  	y = pow(0.5, 1/(double)HALFLIFE);
  
  	calc_runnable_avg_yN_inv();
  //	calc_runnable_avg_yN_sum();
  	calc_converged_max();
  //	calc_accumulated_sum_32();
  }