diff options
| -rw-r--r-- | xen/common/sched_sedf.c | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/xen/common/sched_sedf.c b/xen/common/sched_sedf.c index 9f7701d12a..7b42062729 100644 --- a/xen/common/sched_sedf.c +++ b/xen/common/sched_sedf.c @@ -360,24 +360,23 @@ static int sedf_init_vcpu(struct vcpu *v) INIT_LIST_HEAD(EXTRAQ(v->processor,EXTRA_UTIL_Q)); } + /* Every VCPU gets an equal share of extratime by default. */ + inf->deadl_abs = 0; + inf->latency = 0; + inf->status = EXTRA_AWARE | SEDF_ASLEEP; + inf->extraweight = 1; + if ( v->domain->domain_id == 0 ) { - /*set dom0 to something useful to boot the machine*/ + /* Domain0 gets 75% guaranteed (15ms every 20ms). */ inf->period = MILLISECS(20); inf->slice = MILLISECS(15); - inf->latency = 0; - inf->deadl_abs = 0; - inf->status = EXTRA_AWARE | SEDF_ASLEEP; } else { - /*other domains run in best effort mode*/ + /* Best-effort extratime only. */ inf->period = WEIGHT_PERIOD; inf->slice = 0; - inf->deadl_abs = 0; - inf->latency = 0; - inf->status = EXTRA_AWARE | SEDF_ASLEEP; - inf->extraweight = 1; } inf->period_orig = inf->period; inf->slice_orig = inf->slice; @@ -609,7 +608,16 @@ static void desched_extra_dom(s_time_t now, struct vcpu *d) PRINT(3,"Domain %i.%i: Short_block_loss: %"PRIi64"\n", inf->vcpu->domain->domain_id, inf->vcpu->vcpu_id, inf->short_block_lost_tot); +#if 0 + /* + * KAF: If we don't exit short-blocking state at this point + * domain0 can steal all CPU for up to 10 seconds before + * scheduling settles down (when competing against another + * CPU-bound domain). Doing this seems to make things behave + * nicely. Noone gets starved by default. + */ if ( inf->short_block_lost_tot <= 0 ) +#endif { PRINT(4,"Domain %i.%i compensated short block loss!\n", inf->vcpu->domain->domain_id, inf->vcpu->vcpu_id); |