android-kvm / linux / 9557e60b8c3521e43bf5f21db95b2b42d7c43ac9 / . / include / linux / sched / loadavg.h

/* SPDX-License-Identifier: GPL-2.0 */ | |

#ifndef _LINUX_SCHED_LOADAVG_H | |

#define _LINUX_SCHED_LOADAVG_H | |

/* | |

* These are the constant used to fake the fixed-point load-average | |

* counting. Some notes: | |

* - 11 bit fractions expand to 22 bits by the multiplies: this gives | |

* a load-average precision of 10 bits integer + 11 bits fractional | |

* - if you want to count load-averages more often, you need more | |

* precision, or rounding will get you. With 2-second counting freq, | |

* the EXP_n values would be 1981, 2034 and 2043 if still using only | |

* 11 bit fractions. | |

*/ | |

extern unsigned long avenrun[]; /* Load averages */ | |

extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift); | |

#define FSHIFT 11 /* nr of bits of precision */ | |

#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ | |

#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ | |

#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ | |

#define EXP_5 2014 /* 1/exp(5sec/5min) */ | |

#define EXP_15 2037 /* 1/exp(5sec/15min) */ | |

/* | |

* a1 = a0 * e + a * (1 - e) | |

*/ | |

static inline unsigned long | |

calc_load(unsigned long load, unsigned long exp, unsigned long active) | |

{ | |

unsigned long newload; | |

newload = load * exp + active * (FIXED_1 - exp); | |

if (active >= load) | |

newload += FIXED_1-1; | |

return newload / FIXED_1; | |

} | |

extern unsigned long calc_load_n(unsigned long load, unsigned long exp, | |

unsigned long active, unsigned int n); | |

#define LOAD_INT(x) ((x) >> FSHIFT) | |

#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100) | |

extern void calc_global_load(void); | |

#endif /* _LINUX_SCHED_LOADAVG_H */ |