Re: [PATCH 4/9] sched: loadavg: consolidate LOAD_INT, LOAD_FRAC, CALC_LOAD

Andrew Morton
2018-09-12T23:28:28Z

On Tue, 28 Aug 2018 13:22:53 -0400 Johannes Weiner <hannes@cmpxchg.org> wrote:

> There are several definitions of those functions/macros in places that
> mess with fixed-point load averages. Provide an official version.

missed blk-iolatency.c for some reason?

--- a/block/blk-iolatency.c~sched-loadavg-consolidate-load_int-load_frac-calc_load-fix
+++ a/block/blk-iolatency.c
@@ -139,7 +139,7 @@ struct iolatency_grp {
#define BLKIOLATENCY_MAX_WIN_SIZE NSEC_PER_SEC
/*
* These are the constants used to fake the fixed-point moving average
- * calculation just like load average. The call to CALC_LOAD folds
+ * calculation just like load average. The call to calc_load() folds
* (FIXED_1 (2048) - exp_factor) * new_sample into lat_avg. The sampling
* window size is bucketed to try to approximately calculate average
* latency such that 1/exp (decay rate) is [1 min, 2.5 min) when windows
@@ -503,7 +503,7 @@ static void iolatency_check_latencies(st
lat_info = &parent->child_lat;

/*
- * CALC_LOAD takes in a number stored in fixed point representation.
+ * calc_load() takes in a number stored in fixed point representation.
* Because we are using this for IO time in ns, the values stored
* are significantly larger than the FIXED_1 denominator (2048).
* Therefore, rounding errors in the calculation are negligible and
@@ -512,7 +512,7 @@ static void iolatency_check_latencies(st
exp_idx = min_t(int, BLKIOLATENCY_NR_EXP_FACTORS - 1,
div64_u64(iolat->cur_win_nsec,
BLKIOLATENCY_EXP_BUCKET_SIZE));
- CALC_LOAD(iolat->lat_avg, iolatency_exp_factors[exp_idx], stat.mean);
+ calc_load(iolat->lat_avg, iolatency_exp_factors[exp_idx], stat.mean);

/* Everything is ok and we don't need to adjust the scale. */
if (stat.mean <= iolat->min_lat_nsec &&
_