Especially in the do_schedule() functions of the different schedulers using smp_processor_id() for the local cpu number is correct only if the sched_unit is a single vcpu. As soon as larger sched_units are used most uses should be replaced by the cpu number of the local sched_resource instead.
Add a helper to get that sched_resource cpu and modify the schedulers to use it in a correct way. Signed-off-by: Juergen Gross <jgr...@suse.com> --- xen/common/sched_arinc653.c | 2 +- xen/common/sched_credit.c | 21 +++++++++--------- xen/common/sched_credit2.c | 53 +++++++++++++++++++++++---------------------- xen/common/sched_null.c | 17 ++++++++------- xen/common/sched_rt.c | 17 ++++++++------- xen/include/xen/sched-if.h | 5 +++++ 6 files changed, 62 insertions(+), 53 deletions(-) diff --git a/xen/common/sched_arinc653.c b/xen/common/sched_arinc653.c index 213bc960ef..e48f2b2eb9 100644 --- a/xen/common/sched_arinc653.c +++ b/xen/common/sched_arinc653.c @@ -513,7 +513,7 @@ a653sched_do_schedule( static unsigned int sched_index = 0; static s_time_t next_switch_time; a653sched_priv_t *sched_priv = SCHED_PRIV(ops); - const unsigned int cpu = smp_processor_id(); + const unsigned int cpu = sched_get_resource_cpu(smp_processor_id()); unsigned long flags; spin_lock_irqsave(&sched_priv->lock, flags); diff --git a/xen/common/sched_credit.c b/xen/common/sched_credit.c index 05df9e54ac..e67b9bb23e 100644 --- a/xen/common/sched_credit.c +++ b/xen/common/sched_credit.c @@ -1690,7 +1690,7 @@ csched_load_balance(struct csched_private *prv, int cpu, int peer_cpu, first_cpu, peer_node, bstep; int node = cpu_to_node(cpu); - BUG_ON( cpu != sched_unit_cpu(snext->unit) ); + BUG_ON( sched_get_resource_cpu(cpu) != sched_unit_cpu(snext->unit) ); online = cpupool_online_cpumask(c); /* @@ -1831,8 +1831,9 @@ static struct task_slice csched_schedule( const struct scheduler *ops, s_time_t now, bool_t tasklet_work_scheduled) { - const int cpu = smp_processor_id(); - struct list_head * const runq = RUNQ(cpu); + const unsigned int cpu = smp_processor_id(); + const unsigned int sched_cpu = sched_get_resource_cpu(cpu); + struct list_head * const runq = RUNQ(sched_cpu); struct sched_unit *unit = current->sched_unit; struct csched_unit * const scurr = CSCHED_UNIT(unit); struct csched_private *prv = CSCHED_PRIV(ops); @@ -1942,7 +1943,7 @@ csched_schedule( { BUG_ON( is_idle_unit(unit) || list_empty(runq) ); /* Current has blocked. Update the runnable counter for this cpu. */ - dec_nr_runnable(cpu); + dec_nr_runnable(sched_cpu); } snext = __runq_elem(runq->next); @@ -1952,7 +1953,7 @@ csched_schedule( if ( tasklet_work_scheduled ) { TRACE_0D(TRC_CSCHED_SCHED_TASKLET); - snext = CSCHED_UNIT(sched_idle_unit(cpu)); + snext = CSCHED_UNIT(sched_idle_unit(sched_cpu)); snext->pri = CSCHED_PRI_TS_BOOST; } @@ -1972,7 +1973,7 @@ csched_schedule( if ( snext->pri > CSCHED_PRI_TS_OVER ) __runq_remove(snext); else - snext = csched_load_balance(prv, cpu, snext, &ret.migrated); + snext = csched_load_balance(prv, sched_cpu, snext, &ret.migrated); /* * Update idlers mask if necessary. When we're idling, other CPUs @@ -1980,12 +1981,12 @@ csched_schedule( */ if ( !tasklet_work_scheduled && snext->pri == CSCHED_PRI_IDLE ) { - if ( !cpumask_test_cpu(cpu, prv->idlers) ) - cpumask_set_cpu(cpu, prv->idlers); + if ( !cpumask_test_cpu(sched_cpu, prv->idlers) ) + cpumask_set_cpu(sched_cpu, prv->idlers); } - else if ( cpumask_test_cpu(cpu, prv->idlers) ) + else if ( cpumask_test_cpu(sched_cpu, prv->idlers) ) { - cpumask_clear_cpu(cpu, prv->idlers); + cpumask_clear_cpu(sched_cpu, prv->idlers); } if ( !is_idle_unit(snext->unit) ) diff --git a/xen/common/sched_credit2.c b/xen/common/sched_credit2.c index 0f57135e81..cf502b3cbc 100644 --- a/xen/common/sched_credit2.c +++ b/xen/common/sched_credit2.c @@ -3447,7 +3447,8 @@ static struct task_slice csched2_schedule( const struct scheduler *ops, s_time_t now, bool tasklet_work_scheduled) { - const int cpu = smp_processor_id(); + const unsigned int cpu = smp_processor_id(); + const unsigned int sched_cpu = sched_get_resource_cpu(cpu); struct csched2_runqueue_data *rqd; struct sched_unit *currunit = current->sched_unit; struct csched2_unit * const scurr = csched2_unit(currunit); @@ -3459,22 +3460,22 @@ csched2_schedule( SCHED_STAT_CRANK(schedule); CSCHED2_UNIT_CHECK(currunit); - BUG_ON(!cpumask_test_cpu(cpu, &csched2_priv(ops)->initialized)); + BUG_ON(!cpumask_test_cpu(sched_cpu, &csched2_priv(ops)->initialized)); - rqd = c2rqd(ops, cpu); - BUG_ON(!cpumask_test_cpu(cpu, &rqd->active)); + rqd = c2rqd(ops, sched_cpu); + BUG_ON(!cpumask_test_cpu(sched_cpu, &rqd->active)); - ASSERT(spin_is_locked(get_sched_res(cpu)->schedule_lock)); + ASSERT(spin_is_locked(get_sched_res(sched_cpu)->schedule_lock)); BUG_ON(!is_idle_unit(currunit) && scurr->rqd != rqd); /* Clear "tickled" bit now that we've been scheduled */ - tickled = cpumask_test_cpu(cpu, &rqd->tickled); + tickled = cpumask_test_cpu(sched_cpu, &rqd->tickled); if ( tickled ) { - __cpumask_clear_cpu(cpu, &rqd->tickled); + __cpumask_clear_cpu(sched_cpu, &rqd->tickled); cpumask_andnot(cpumask_scratch, &rqd->idle, &rqd->tickled); - smt_idle_mask_set(cpu, cpumask_scratch, &rqd->smt_idle); + smt_idle_mask_set(sched_cpu, cpumask_scratch, &rqd->smt_idle); } if ( unlikely(tb_init_done) ) @@ -3484,10 +3485,10 @@ csched2_schedule( unsigned tasklet:8, idle:8, smt_idle:8, tickled:8; } d; d.cpu = cpu; - d.rq_id = c2r(cpu); + d.rq_id = c2r(sched_cpu); d.tasklet = tasklet_work_scheduled; d.idle = is_idle_unit(currunit); - d.smt_idle = cpumask_test_cpu(cpu, &rqd->smt_idle); + d.smt_idle = cpumask_test_cpu(sched_cpu, &rqd->smt_idle); d.tickled = tickled; __trace_var(TRC_CSCHED2_SCHEDULE, 1, sizeof(d), @@ -3527,10 +3528,10 @@ csched2_schedule( { __clear_bit(__CSFLAG_unit_yield, &scurr->flags); trace_var(TRC_CSCHED2_SCHED_TASKLET, 1, 0, NULL); - snext = csched2_unit(sched_idle_unit(cpu)); + snext = csched2_unit(sched_idle_unit(sched_cpu)); } else - snext = runq_candidate(rqd, scurr, cpu, now, &skipped_units); + snext = runq_candidate(rqd, scurr, sched_cpu, now, &skipped_units); /* If switching from a non-idle runnable unit, put it * back on the runqueue. */ @@ -3555,10 +3556,10 @@ csched2_schedule( } /* Clear the idle mask if necessary */ - if ( cpumask_test_cpu(cpu, &rqd->idle) ) + if ( cpumask_test_cpu(sched_cpu, &rqd->idle) ) { - __cpumask_clear_cpu(cpu, &rqd->idle); - smt_idle_mask_clear(cpu, &rqd->smt_idle); + __cpumask_clear_cpu(sched_cpu, &rqd->idle); + smt_idle_mask_clear(sched_cpu, &rqd->smt_idle); } /* @@ -3577,18 +3578,18 @@ csched2_schedule( */ if ( skipped_units == 0 && snext->credit <= CSCHED2_CREDIT_RESET ) { - reset_credit(ops, cpu, now, snext); - balance_load(ops, cpu, now); + reset_credit(ops, sched_cpu, now, snext); + balance_load(ops, sched_cpu, now); } snext->start_time = now; snext->tickled_cpu = -1; /* Safe because lock for old processor is held */ - if ( sched_unit_cpu(snext->unit) != cpu ) + if ( sched_unit_cpu(snext->unit) != sched_cpu ) { snext->credit += CSCHED2_MIGRATE_COMPENSATION; - sched_set_res(snext->unit, get_sched_res(cpu)); + sched_set_res(snext->unit, get_sched_res(sched_cpu)); SCHED_STAT_CRANK(migrated); ret.migrated = 1; } @@ -3601,17 +3602,17 @@ csched2_schedule( */ if ( tasklet_work_scheduled ) { - if ( cpumask_test_cpu(cpu, &rqd->idle) ) + if ( cpumask_test_cpu(sched_cpu, &rqd->idle) ) { - __cpumask_clear_cpu(cpu, &rqd->idle); - smt_idle_mask_clear(cpu, &rqd->smt_idle); + __cpumask_clear_cpu(sched_cpu, &rqd->idle); + smt_idle_mask_clear(sched_cpu, &rqd->smt_idle); } } - else if ( !cpumask_test_cpu(cpu, &rqd->idle) ) + else if ( !cpumask_test_cpu(sched_cpu, &rqd->idle) ) { - __cpumask_set_cpu(cpu, &rqd->idle); + __cpumask_set_cpu(sched_cpu, &rqd->idle); cpumask_andnot(cpumask_scratch, &rqd->idle, &rqd->tickled); - smt_idle_mask_set(cpu, cpumask_scratch, &rqd->smt_idle); + smt_idle_mask_set(sched_cpu, cpumask_scratch, &rqd->smt_idle); } /* Make sure avgload gets updated periodically even * if there's no activity */ @@ -3621,7 +3622,7 @@ csched2_schedule( /* * Return task to run next... */ - ret.time = csched2_runtime(ops, cpu, snext, now); + ret.time = csched2_runtime(ops, sched_cpu, snext, now); ret.task = snext->unit; CSCHED2_UNIT_CHECK(ret.task); diff --git a/xen/common/sched_null.c b/xen/common/sched_null.c index 53a20d73aa..6c350a342b 100644 --- a/xen/common/sched_null.c +++ b/xen/common/sched_null.c @@ -701,6 +701,7 @@ static struct task_slice null_schedule(const struct scheduler *ops, { unsigned int bs; const unsigned int cpu = smp_processor_id(); + const unsigned int sched_cpu = sched_get_resource_cpu(cpu); struct null_private *prv = null_priv(ops); struct null_unit *wvc; struct task_slice ret; @@ -716,14 +717,14 @@ static struct task_slice null_schedule(const struct scheduler *ops, } d; d.cpu = cpu; d.tasklet = tasklet_work_scheduled; - if ( per_cpu(npc, cpu).unit == NULL ) + if ( per_cpu(npc, sched_cpu).unit == NULL ) { d.unit = d.dom = -1; } else { - d.unit = per_cpu(npc, cpu).unit->unit_id; - d.dom = per_cpu(npc, cpu).unit->domain->domain_id; + d.unit = per_cpu(npc, sched_cpu).unit->unit_id; + d.dom = per_cpu(npc, sched_cpu).unit->domain->domain_id; } __trace_var(TRC_SNULL_SCHEDULE, 1, sizeof(d), &d); } @@ -731,10 +732,10 @@ static struct task_slice null_schedule(const struct scheduler *ops, if ( tasklet_work_scheduled ) { trace_var(TRC_SNULL_TASKLET, 1, 0, NULL); - ret.task = sched_idle_unit(cpu); + ret.task = sched_idle_unit(sched_cpu); } else - ret.task = per_cpu(npc, cpu).unit; + ret.task = per_cpu(npc, sched_cpu).unit; ret.migrated = 0; ret.time = -1; @@ -765,9 +766,9 @@ static struct task_slice null_schedule(const struct scheduler *ops, !has_soft_affinity(wvc->unit) ) continue; - if ( unit_check_affinity(wvc->unit, cpu, bs) ) + if ( unit_check_affinity(wvc->unit, sched_cpu, bs) ) { - unit_assign(prv, wvc->unit, cpu); + unit_assign(prv, wvc->unit, sched_cpu); list_del_init(&wvc->waitq_elem); ret.task = wvc->unit; goto unlock; @@ -779,7 +780,7 @@ static struct task_slice null_schedule(const struct scheduler *ops, } if ( unlikely(ret.task == NULL || !unit_runnable(ret.task)) ) - ret.task = sched_idle_unit(cpu); + ret.task = sched_idle_unit(sched_cpu); NULL_UNIT_CHECK(ret.task); return ret; diff --git a/xen/common/sched_rt.c b/xen/common/sched_rt.c index 57883bd0a0..ddd1badd38 100644 --- a/xen/common/sched_rt.c +++ b/xen/common/sched_rt.c @@ -1058,7 +1058,8 @@ runq_pick(const struct scheduler *ops, const cpumask_t *mask) static struct task_slice rt_schedule(const struct scheduler *ops, s_time_t now, bool_t tasklet_work_scheduled) { - const int cpu = smp_processor_id(); + const unsigned int cpu = smp_processor_id(); + const unsigned int sched_cpu = sched_get_resource_cpu(cpu); struct rt_private *prv = rt_priv(ops); struct rt_unit *const scurr = rt_unit(current->sched_unit); struct rt_unit *snext = NULL; @@ -1072,7 +1073,7 @@ rt_schedule(const struct scheduler *ops, s_time_t now, bool_t tasklet_work_sched } d; d.cpu = cpu; d.tasklet = tasklet_work_scheduled; - d.tickled = cpumask_test_cpu(cpu, &prv->tickled); + d.tickled = cpumask_test_cpu(sched_cpu, &prv->tickled); d.idle = is_idle_unit(currunit); trace_var(TRC_RTDS_SCHEDULE, 1, sizeof(d), @@ -1080,7 +1081,7 @@ rt_schedule(const struct scheduler *ops, s_time_t now, bool_t tasklet_work_sched } /* clear ticked bit now that we've been scheduled */ - cpumask_clear_cpu(cpu, &prv->tickled); + cpumask_clear_cpu(sched_cpu, &prv->tickled); /* burn_budget would return for IDLE UNIT */ burn_budget(ops, scurr, now); @@ -1088,13 +1089,13 @@ rt_schedule(const struct scheduler *ops, s_time_t now, bool_t tasklet_work_sched if ( tasklet_work_scheduled ) { trace_var(TRC_RTDS_SCHED_TASKLET, 1, 0, NULL); - snext = rt_unit(sched_idle_unit(cpu)); + snext = rt_unit(sched_idle_unit(sched_cpu)); } else { - snext = runq_pick(ops, cpumask_of(cpu)); + snext = runq_pick(ops, cpumask_of(sched_cpu)); if ( snext == NULL ) - snext = rt_unit(sched_idle_unit(cpu)); + snext = rt_unit(sched_idle_unit(sched_cpu)); /* if scurr has higher priority and budget, still pick scurr */ if ( !is_idle_unit(currunit) && @@ -1119,9 +1120,9 @@ rt_schedule(const struct scheduler *ops, s_time_t now, bool_t tasklet_work_sched q_remove(snext); __set_bit(__RTDS_scheduled, &snext->flags); } - if ( sched_unit_cpu(snext->unit) != cpu ) + if ( sched_unit_cpu(snext->unit) != sched_cpu ) { - sched_set_res(snext->unit, get_sched_res(cpu)); + sched_set_res(snext->unit, get_sched_res(sched_cpu)); ret.migrated = 1; } ret.time = snext->cur_budget; /* invoke the scheduler next time */ diff --git a/xen/include/xen/sched-if.h b/xen/include/xen/sched-if.h index 2a8789b438..8b349069db 100644 --- a/xen/include/xen/sched-if.h +++ b/xen/include/xen/sched-if.h @@ -110,6 +110,11 @@ static inline struct sched_unit *sched_idle_unit(unsigned int cpu) return idle_vcpu[cpu]->sched_unit; } +static inline unsigned int sched_get_resource_cpu(unsigned int cpu) +{ + return get_sched_res(cpu)->processor; +} + /* * Scratch space, for avoiding having too many cpumask_t on the stack. * Within each scheduler, when using the scratch mask of one pCPU: -- 2.16.4 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel