[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen staging] xen/sched: add is_running indicator to struct sched_unit
commit 6533eb52e064b333cb688ff0ec30e40e2338a63b Author: Juergen Gross <jgross@xxxxxxxx> AuthorDate: Fri Sep 27 09:00:17 2019 +0200 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Fri Sep 27 15:22:11 2019 +0200 xen/sched: add is_running indicator to struct sched_unit Add an is_running indicator to struct sched_unit which will be set whenever the unit is being scheduled. Switch scheduler code to use unit->is_running instead of vcpu->is_running for scheduling decisions. At the same time introduce a state_entry_time field in struct sched_unit being updated whenever the is_running indicator is changed. Use that new field in the schedulers instead of the similar vcpu field. Signed-off-by: Juergen Gross <jgross@xxxxxxxx> Reviewed-by: Dario Faggioli <dfaggioli@xxxxxxxx> --- xen/common/sched_credit.c | 12 +++++++----- xen/common/sched_credit2.c | 18 +++++++++--------- xen/common/sched_rt.c | 2 +- xen/common/schedule.c | 13 ++++++++++--- xen/include/xen/sched.h | 6 ++++++ 5 files changed, 33 insertions(+), 18 deletions(-) diff --git a/xen/common/sched_credit.c b/xen/common/sched_credit.c index 732fd461b5..9404ccfd90 100644 --- a/xen/common/sched_credit.c +++ b/xen/common/sched_credit.c @@ -709,7 +709,7 @@ __csched_vcpu_is_migrateable(const struct csched_private *prv, struct vcpu *vc, * The caller is supposed to have already checked that vc is also * not running. */ - ASSERT(!vc->is_running); + ASSERT(!vc->sched_unit->is_running); return !__csched_vcpu_is_cache_hot(prv, svc) && cpumask_test_cpu(dest_cpu, mask); @@ -1033,7 +1033,8 @@ csched_unit_insert(const struct scheduler *ops, struct sched_unit *unit) lock = unit_schedule_lock_irq(unit); - if ( !__vcpu_on_runq(svc) && vcpu_runnable(vc) && !vc->is_running ) + if ( !__vcpu_on_runq(svc) && vcpu_runnable(vc) && + !vc->sched_unit->is_running ) runq_insert(svc); unit_schedule_unlock_irq(lock, unit); @@ -1646,8 +1647,9 @@ csched_runq_steal(int peer_cpu, int cpu, int pri, int balance_step) * vCPUs with useful soft affinities in some sort of bitmap * or counter. */ - if ( vc->is_running || (balance_step == BALANCE_SOFT_AFFINITY && - !has_soft_affinity(vc->sched_unit)) ) + if ( vc->sched_unit->is_running || + (balance_step == BALANCE_SOFT_AFFINITY && + !has_soft_affinity(vc->sched_unit)) ) continue; affinity_balance_cpumask(vc->sched_unit, balance_step, cpumask_scratch); @@ -1855,7 +1857,7 @@ csched_schedule( (unsigned char *)&d); } - runtime = now - current->runstate.state_entry_time; + runtime = now - current->sched_unit->state_entry_time; if ( runtime < 0 ) /* Does this ever happen? */ runtime = 0; diff --git a/xen/common/sched_credit2.c b/xen/common/sched_credit2.c index 8857c98dd8..7ec61a2649 100644 --- a/xen/common/sched_credit2.c +++ b/xen/common/sched_credit2.c @@ -1284,7 +1284,7 @@ runq_insert(const struct scheduler *ops, struct csched2_unit *svc) ASSERT(&svc->rqd->runq == runq); ASSERT(!is_idle_vcpu(svc->vcpu)); - ASSERT(!svc->vcpu->is_running); + ASSERT(!svc->vcpu->sched_unit->is_running); ASSERT(!(svc->flags & CSFLAG_scheduled)); list_for_each( iter, runq ) @@ -1341,8 +1341,8 @@ static inline bool is_preemptable(const struct csched2_unit *svc, if ( ratelimit <= CSCHED2_RATELIMIT_TICKLE_TOLERANCE ) return true; - ASSERT(svc->vcpu->is_running); - return now - svc->vcpu->runstate.state_entry_time > + ASSERT(svc->vcpu->sched_unit->is_running); + return now - svc->vcpu->sched_unit->state_entry_time > ratelimit - CSCHED2_RATELIMIT_TICKLE_TOLERANCE; } @@ -2932,7 +2932,7 @@ csched2_dom_cntl( { svc = csched2_unit(v->sched_unit); lock = unit_schedule_lock(svc->vcpu->sched_unit); - if ( v->is_running ) + if ( v->sched_unit->is_running ) { unsigned int cpu = v->processor; struct csched2_runqueue_data *rqd = c2rqd(ops, cpu); @@ -3205,8 +3205,8 @@ csched2_runtime(const struct scheduler *ops, int cpu, if ( prv->ratelimit_us ) { s_time_t ratelimit_min = MICROSECS(prv->ratelimit_us); - if ( snext->vcpu->is_running ) - ratelimit_min = snext->vcpu->runstate.state_entry_time + + if ( snext->vcpu->sched_unit->is_running ) + ratelimit_min = snext->vcpu->sched_unit->state_entry_time + MICROSECS(prv->ratelimit_us) - now; if ( ratelimit_min > min_time ) min_time = ratelimit_min; @@ -3303,7 +3303,7 @@ runq_candidate(struct csched2_runqueue_data *rqd, * no point forcing it to do so until rate limiting expires. */ if ( !yield && prv->ratelimit_us && vcpu_runnable(scurr->vcpu) && - (now - scurr->vcpu->runstate.state_entry_time) < + (now - scurr->vcpu->sched_unit->state_entry_time) < MICROSECS(prv->ratelimit_us) ) { if ( unlikely(tb_init_done) ) @@ -3314,7 +3314,7 @@ runq_candidate(struct csched2_runqueue_data *rqd, } d; d.dom = scurr->vcpu->domain->domain_id; d.vcpu = scurr->vcpu->vcpu_id; - d.runtime = now - scurr->vcpu->runstate.state_entry_time; + d.runtime = now - scurr->vcpu->sched_unit->state_entry_time; __trace_var(TRC_CSCHED2_RATELIMIT, 1, sizeof(d), (unsigned char *)&d); @@ -3562,7 +3562,7 @@ csched2_schedule( if ( snext != scurr ) { ASSERT(snext->rqd == rqd); - ASSERT(!snext->vcpu->is_running); + ASSERT(!snext->vcpu->sched_unit->is_running); runq_remove(snext); __set_bit(__CSFLAG_scheduled, &snext->flags); diff --git a/xen/common/sched_rt.c b/xen/common/sched_rt.c index 856eae1faa..13e0d754ab 100644 --- a/xen/common/sched_rt.c +++ b/xen/common/sched_rt.c @@ -905,7 +905,7 @@ rt_unit_insert(const struct scheduler *ops, struct sched_unit *unit) { replq_insert(ops, svc); - if ( !vc->is_running ) + if ( !unit->is_running ) runq_insert(ops, svc); } unit_schedule_unlock_irq(lock, unit); diff --git a/xen/common/schedule.c b/xen/common/schedule.c index 157b91c439..b027c084bf 100644 --- a/xen/common/schedule.c +++ b/xen/common/schedule.c @@ -412,6 +412,8 @@ int sched_init_vcpu(struct vcpu *v, unsigned int processor) { get_sched_res(v->processor)->curr = unit; v->is_running = 1; + unit->is_running = true; + unit->state_entry_time = NOW(); } else { @@ -732,7 +734,8 @@ static void vcpu_migrate_finish(struct vcpu *v) * context_saved(); and in any case, if the bit is cleared, then * someone else has already done the work so we don't need to. */ - if ( v->is_running || !test_bit(_VPF_migrating, &v->pause_flags) ) + if ( v->sched_unit->is_running || + !test_bit(_VPF_migrating, &v->pause_flags) ) return; old_cpu = new_cpu = v->processor; @@ -786,7 +789,7 @@ static void vcpu_migrate_finish(struct vcpu *v) * because they both happen in (different) spinlock regions, and those * regions are strictly serialised. */ - if ( v->is_running || + if ( v->sched_unit->is_running || !test_and_clear_bit(_VPF_migrating, &v->pause_flags) ) { sched_spin_unlock_double(old_lock, new_lock, flags); @@ -1674,8 +1677,10 @@ static void schedule(void) * switch, else lost_records resume will not work properly. */ - ASSERT(!next->is_running); + ASSERT(!next->sched_unit->is_running); next->is_running = 1; + next->sched_unit->is_running = true; + next->sched_unit->state_entry_time = now; pcpu_schedule_unlock_irq(lock, cpu); @@ -1697,6 +1702,8 @@ void context_saved(struct vcpu *prev) smp_wmb(); prev->is_running = 0; + prev->sched_unit->is_running = false; + prev->sched_unit->state_entry_time = NOW(); /* Check for migration request /after/ clearing running flag. */ smp_mb(); diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h index 3227d2fe71..5646d620c3 100644 --- a/xen/include/xen/sched.h +++ b/xen/include/xen/sched.h @@ -270,8 +270,14 @@ struct sched_unit { struct sched_resource *res; unsigned int unit_id; + /* Currently running on a CPU? */ + bool is_running; /* Does soft affinity actually play a role (given hard affinity)? */ bool soft_aff_effective; + + /* Last time unit got (de-)scheduled. */ + uint64_t state_entry_time; + /* Bitmask of CPUs on which this VCPU may run. */ cpumask_var_t cpu_hard_affinity; /* Used to save affinity during temporary pinning. */ -- generated by git-patchbot for /home/xen/git/xen.git#staging _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/xen-changelog
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