diff options
| author | Ingo Molnar <mingo@kernel.org> | 2017-02-01 20:25:37 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-03-02 10:42:43 +0300 |
| commit | dea38c74cb9205341f52b8d8ae18f61247a43ea8 (patch) | |
| tree | 4eb3ec3462aae3ae89e853476bf1965990646a15 /include/linux/sched/loadavg.h | |
| parent | e2d1e2aec572a2138dea74d53be54a1406d419c0 (diff) | |
| download | linux-dea38c74cb9205341f52b8d8ae18f61247a43ea8.tar.xz | |
sched/headers: Move loadavg related definitions from <linux/sched.h> to <linux/sched/loadavg.h>
Move these bits to <linux/sched/loadavg.h>, to reduce the size and
complexity of <linux/sched.h>.
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/sched/loadavg.h')
| -rw-r--r-- | include/linux/sched/loadavg.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/linux/sched/loadavg.h b/include/linux/sched/loadavg.h index 3ae74be327e8..c392e28ce0ac 100644 --- a/include/linux/sched/loadavg.h +++ b/include/linux/sched/loadavg.h @@ -3,4 +3,31 @@ #include <linux/sched.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) */ + +#define CALC_LOAD(load,exp,n) \ + load *= exp; \ + load += n*(FIXED_1-exp); \ + load >>= FSHIFT; + +extern void calc_global_load(unsigned long ticks); + #endif /* _LINUX_SCHED_LOADAVG_H */ |