diff options
Diffstat (limited to 'block/blk-iocost.c')
| -rw-r--r-- | block/blk-iocost.c | 19 |
1 files changed, 7 insertions, 12 deletions
diff --git a/block/blk-iocost.c b/block/blk-iocost.c index c1cd66cfa2a8..a3889a8b0a33 100644 --- a/block/blk-iocost.c +++ b/block/blk-iocost.c @@ -1508,7 +1508,7 @@ static void ioc_timer_fn(struct timer_list *timer) struct ioc_gq *iocg, *tiocg; struct ioc_now now; LIST_HEAD(surpluses); - int nr_surpluses = 0, nr_shortages = 0, nr_lagging = 0; + int nr_shortages = 0, nr_lagging = 0; u32 ppm_rthr = MILLION - ioc->params.qos[QOS_RPPM]; u32 ppm_wthr = MILLION - ioc->params.qos[QOS_WPPM]; u32 missed_ppm[2], rq_wait_pct; @@ -1640,10 +1640,8 @@ static void ioc_timer_fn(struct timer_list *timer) atomic64_add(delta, &iocg->vtime); atomic64_add(delta, &iocg->done_vtime); /* if usage is sufficiently low, maybe it can donate */ - if (surplus_adjusted_hweight_inuse(usage, hw_inuse)) { + if (surplus_adjusted_hweight_inuse(usage, hw_inuse)) list_add(&iocg->surplus_list, &surpluses); - nr_surpluses++; - } } else if (hw_inuse < hw_active) { u32 new_hwi, new_inuse; @@ -1673,7 +1671,7 @@ static void ioc_timer_fn(struct timer_list *timer) } } - if (!nr_shortages || !nr_surpluses) + if (!nr_shortages || list_empty(&surpluses)) goto skip_surplus_transfers; /* there are both shortages and surpluses, transfer surpluses */ @@ -1738,11 +1736,9 @@ skip_surplus_transfers: /* * If there are IOs spanning multiple periods, wait - * them out before pushing the device harder. If - * there are surpluses, let redistribution work it - * out first. + * them out before pushing the device harder. */ - if (!nr_lagging && !nr_surpluses) + if (!nr_lagging) ioc->busy_level--; } else { /* @@ -1796,15 +1792,14 @@ skip_surplus_transfers: } trace_iocost_ioc_vrate_adj(ioc, vrate, missed_ppm, rq_wait_pct, - nr_lagging, nr_shortages, - nr_surpluses); + nr_lagging, nr_shortages); atomic64_set(&ioc->vtime_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, nr_surpluses); + nr_shortages); } ioc_refresh_params(ioc, false); |