diff options
| -rw-r--r-- | block/blk-iocost.c | 99 |
1 files changed, 54 insertions, 45 deletions
diff --git a/block/blk-iocost.c b/block/blk-iocost.c index 7dd1424d5833..ffa418c0dcb1 100644 --- a/block/blk-iocost.c +++ b/block/blk-iocost.c @@ -971,6 +971,58 @@ done: ioc->vtime_err = clamp(ioc->vtime_err, -vperiod, vperiod); } +static void ioc_adjust_base_vrate(struct ioc *ioc, u32 rq_wait_pct, + int nr_lagging, int nr_shortages, + int prev_busy_level, u32 *missed_ppm) +{ + u64 vrate = ioc->vtime_base_rate; + u64 vrate_min = ioc->vrate_min, vrate_max = ioc->vrate_max; + + if (!ioc->busy_level || (ioc->busy_level < 0 && nr_lagging)) { + if (ioc->busy_level != prev_busy_level || nr_lagging) + trace_iocost_ioc_vrate_adj(ioc, atomic64_read(&ioc->vtime_rate), + missed_ppm, rq_wait_pct, + nr_lagging, nr_shortages); + + return; + } + + /* rq_wait signal is always reliable, ignore user vrate_min */ + if (rq_wait_pct > RQ_WAIT_BUSY_PCT) + vrate_min = VRATE_MIN; + + /* + * If vrate is out of bounds, apply clamp gradually as the + * bounds can change abruptly. Otherwise, apply busy_level + * based adjustment. + */ + if (vrate < vrate_min) { + vrate = div64_u64(vrate * (100 + VRATE_CLAMP_ADJ_PCT), 100); + vrate = min(vrate, vrate_min); + } else if (vrate > vrate_max) { + vrate = div64_u64(vrate * (100 - VRATE_CLAMP_ADJ_PCT), 100); + vrate = max(vrate, vrate_max); + } else { + int idx = min_t(int, abs(ioc->busy_level), + ARRAY_SIZE(vrate_adj_pct) - 1); + u32 adj_pct = vrate_adj_pct[idx]; + + if (ioc->busy_level > 0) + adj_pct = 100 - adj_pct; + else + adj_pct = 100 + adj_pct; + + vrate = clamp(DIV64_U64_ROUND_UP(vrate * adj_pct, 100), + vrate_min, vrate_max); + } + + trace_iocost_ioc_vrate_adj(ioc, vrate, missed_ppm, rq_wait_pct, + nr_lagging, nr_shortages); + + ioc->vtime_base_rate = vrate; + ioc_refresh_margins(ioc); +} + /* take a snapshot of the current [v]time and vrate */ static void ioc_now(struct ioc *ioc, struct ioc_now *now) { @@ -2323,51 +2375,8 @@ static void ioc_timer_fn(struct timer_list *timer) ioc->busy_level = clamp(ioc->busy_level, -1000, 1000); - if (ioc->busy_level > 0 || (ioc->busy_level < 0 && !nr_lagging)) { - u64 vrate = ioc->vtime_base_rate; - u64 vrate_min = ioc->vrate_min, vrate_max = ioc->vrate_max; - - /* rq_wait signal is always reliable, ignore user vrate_min */ - if (rq_wait_pct > RQ_WAIT_BUSY_PCT) - vrate_min = VRATE_MIN; - - /* - * If vrate is out of bounds, apply clamp gradually as the - * bounds can change abruptly. Otherwise, apply busy_level - * based adjustment. - */ - if (vrate < vrate_min) { - vrate = div64_u64(vrate * (100 + VRATE_CLAMP_ADJ_PCT), - 100); - vrate = min(vrate, vrate_min); - } else if (vrate > vrate_max) { - vrate = div64_u64(vrate * (100 - VRATE_CLAMP_ADJ_PCT), - 100); - vrate = max(vrate, vrate_max); - } else { - int idx = min_t(int, abs(ioc->busy_level), - ARRAY_SIZE(vrate_adj_pct) - 1); - u32 adj_pct = vrate_adj_pct[idx]; - - if (ioc->busy_level > 0) - adj_pct = 100 - adj_pct; - else - adj_pct = 100 + adj_pct; - - vrate = clamp(DIV64_U64_ROUND_UP(vrate * adj_pct, 100), - vrate_min, vrate_max); - } - - trace_iocost_ioc_vrate_adj(ioc, vrate, missed_ppm, rq_wait_pct, - nr_lagging, nr_shortages); - - ioc->vtime_base_rate = vrate; - ioc_refresh_margins(ioc); - } else if (ioc->busy_level != prev_busy_level || nr_lagging) { - trace_iocost_ioc_vrate_adj(ioc, atomic64_read(&ioc->vtime_rate), - missed_ppm, rq_wait_pct, nr_lagging, - nr_shortages); - } + ioc_adjust_base_vrate(ioc, rq_wait_pct, nr_lagging, nr_shortages, + prev_busy_level, missed_ppm); ioc_refresh_params(ioc, false); |