In several places there is support for multiple vcpus per sched unit
missing. Add that missing support (with the exception of initial
allocation) and missing helpers for that.
Signed-off-by: Juergen Gross <jgr...@suse.com>
---
RFC V2:
- fix vcpu_runstate_helper()
V1:
- add special handling for idle unit in unit_runnable() and
unit_runnable_state()
V2:
- handle affinity_broken correctly (Jan Beulich)
V3:
- type for cpu ->unsigned int (Jan Beulich)
---
xen/common/domain.c | 5 +++-
xen/common/schedule.c | 37 +++++++++++++-------------
xen/include/xen/sched-if.h | 65 +++++++++++++++++++++++++++++++++++++++-------
3 files changed, 79 insertions(+), 28 deletions(-)
diff --git a/xen/common/domain.c b/xen/common/domain.c
index fa4023936b..ea6aee3858 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -1259,7 +1259,10 @@ int vcpu_reset(struct vcpu *v)
v->async_exception_mask = 0;
memset(v->async_exception_state, 0, sizeof(v->async_exception_state));
#endif
- v->affinity_broken = 0;
+ if ( v->affinity_broken & VCPU_AFFINITY_OVERRIDE )
+ vcpu_temporary_affinity(v, NR_CPUS, VCPU_AFFINITY_OVERRIDE);
+ if ( v->affinity_broken & VCPU_AFFINITY_WAIT )
+ vcpu_temporary_affinity(v, NR_CPUS, VCPU_AFFINITY_WAIT);
clear_bit(_VPF_blocked, &v->pause_flags);
clear_bit(_VPF_in_reset, &v->pause_flags);
diff --git a/xen/common/schedule.c b/xen/common/schedule.c
index 03bcf796ae..a79065c826 100644
--- a/xen/common/schedule.c
+++ b/xen/common/schedule.c
@@ -243,8 +243,9 @@ static inline void vcpu_runstate_change(
s_time_t delta;
struct sched_unit *unit = v->sched_unit;
- ASSERT(v->runstate.state != new_state);
ASSERT(spin_is_locked(get_sched_res(v->processor)->schedule_lock));
+ if ( v->runstate.state == new_state )
+ return;
vcpu_urgent_count_update(v);
@@ -266,15 +267,16 @@ static inline void vcpu_runstate_change(
static inline void sched_unit_runstate_change(struct sched_unit *unit,
bool running, s_time_t new_entry_time)
{
- struct vcpu *v = unit->vcpu_list;
+ struct vcpu *v;
- if ( running )
- vcpu_runstate_change(v, v->new_state, new_entry_time);
- else
- vcpu_runstate_change(v,
- ((v->pause_flags & VPF_blocked) ? RUNSTATE_blocked :
- (vcpu_runnable(v) ? RUNSTATE_runnable : RUNSTATE_offline)),
- new_entry_time);
+ for_each_sched_unit_vcpu ( unit, v )
+ if ( running )
+ vcpu_runstate_change(v, v->new_state, new_entry_time);
+ else
+ vcpu_runstate_change(v,
+ ((v->pause_flags & VPF_blocked) ? RUNSTATE_blocked :
+ (vcpu_runnable(v) ? RUNSTATE_runnable : RUNSTATE_offline)),
+ new_entry_time);
}
void vcpu_runstate_get(struct vcpu *v, struct vcpu_runstate_info *runstate)
@@ -1031,10 +1033,9 @@ int cpu_disable_scheduler(unsigned int cpu)
if ( cpumask_empty(&online_affinity) &&
cpumask_test_cpu(cpu, unit->cpu_hard_affinity) )
{
- /* TODO: multiple vcpus per unit. */
- if ( unit->vcpu_list->affinity_broken )
+ if ( sched_check_affinity_broken(unit) )
{
- /* The vcpu is temporarily pinned, can't move it. */
+ /* The unit is temporarily pinned, can't move it. */
unit_schedule_unlock_irqrestore(lock, flags, unit);
ret = -EADDRINUSE;
break;
@@ -1392,17 +1393,17 @@ int vcpu_temporary_affinity(struct vcpu *v, unsigned
int cpu, uint8_t reason)
ret = 0;
v->affinity_broken &= ~reason;
}
- if ( !ret && !v->affinity_broken )
+ if ( !ret && !sched_check_affinity_broken(unit) )
sched_set_affinity(v, unit->cpu_hard_affinity_saved, NULL);
}
else if ( cpu < nr_cpu_ids )
{
if ( (v->affinity_broken & reason) ||
- (v->affinity_broken && v->processor != cpu) )
+ (sched_check_affinity_broken(unit) && v->processor != cpu) )
ret = -EBUSY;
else if ( cpumask_test_cpu(cpu, VCPU2ONLINE(v)) )
{
- if ( !v->affinity_broken )
+ if ( !sched_check_affinity_broken(unit) )
{
cpumask_copy(unit->cpu_hard_affinity_saved,
unit->cpu_hard_affinity);
@@ -1722,14 +1723,14 @@ static void sched_switch_units(struct sched_resource
*sd,
(next->vcpu_list->runstate.state == RUNSTATE_runnable) ?
(now - next->state_entry_time) : 0, prev->next_time);
- ASSERT(prev->vcpu_list->runstate.state == RUNSTATE_running);
+ ASSERT(unit_running(prev));
TRACE_4D(TRC_SCHED_SWITCH, prev->domain->domain_id, prev->unit_id,
next->domain->domain_id, next->unit_id);
sched_unit_runstate_change(prev, false, now);
- ASSERT(next->vcpu_list->runstate.state != RUNSTATE_running);
+ ASSERT(!unit_running(next));
sched_unit_runstate_change(next, true, now);
/*
@@ -1851,7 +1852,7 @@ void sched_context_switched(struct vcpu *vprev, struct
vcpu *vnext)
while ( atomic_read(&next->rendezvous_out_cnt) )
cpu_relax();
}
- else if ( vprev != vnext )
+ else if ( vprev != vnext && sched_granularity == 1 )
context_saved(vprev);
}
diff --git a/xen/include/xen/sched-if.h b/xen/include/xen/sched-if.h
index 25ba6f25c9..6a4dbac935 100644
--- a/xen/include/xen/sched-if.h
+++ b/xen/include/xen/sched-if.h
@@ -68,12 +68,32 @@ static inline bool is_idle_unit(const struct sched_unit
*unit)
static inline bool is_unit_online(const struct sched_unit *unit)
{
- return is_vcpu_online(unit->vcpu_list);
+ struct vcpu *v;
+
+ for_each_sched_unit_vcpu ( unit, v )
+ if ( is_vcpu_online(v) )
+ return true;
+
+ return false;
+}
+
+static inline unsigned int unit_running(const struct sched_unit *unit)
+{
+ return unit->runstate_cnt[RUNSTATE_running];
}
static inline bool unit_runnable(const struct sched_unit *unit)
{
- return vcpu_runnable(unit->vcpu_list);
+ struct vcpu *v;
+
+ if ( is_idle_unit(unit) )
+ return true;
+
+ for_each_sched_unit_vcpu ( unit, v )
+ if ( vcpu_runnable(v) )
+ return true;
+
+ return false;
}
static inline bool unit_runnable_state(const struct sched_unit *unit)
@@ -102,7 +122,16 @@ static inline bool unit_runnable_state(const struct
sched_unit *unit)
static inline void sched_set_res(struct sched_unit *unit,
struct sched_resource *res)
{
- unit->vcpu_list->processor = res->master_cpu;
+ unsigned int cpu = cpumask_first(res->cpus);
+ struct vcpu *v;
+
+ for_each_sched_unit_vcpu ( unit, v )
+ {
+ ASSERT(cpu < nr_cpu_ids);
+ v->processor = cpu;
+ cpu = cpumask_next(cpu, res->cpus);
+ }
+
unit->res = res;
}
@@ -114,25 +143,37 @@ static inline unsigned int sched_unit_cpu(const struct
sched_unit *unit)
static inline void sched_set_pause_flags(struct sched_unit *unit,
unsigned int bit)
{
- __set_bit(bit, &unit->vcpu_list->pause_flags);
+ struct vcpu *v;
+
+ for_each_sched_unit_vcpu ( unit, v )
+ __set_bit(bit, &v->pause_flags);
}
static inline void sched_clear_pause_flags(struct sched_unit *unit,
unsigned int bit)
{
- __clear_bit(bit, &unit->vcpu_list->pause_flags);
+ struct vcpu *v;
+
+ for_each_sched_unit_vcpu ( unit, v )
+ __clear_bit(bit, &v->pause_flags);
}
static inline void sched_set_pause_flags_atomic(struct sched_unit *unit,
unsigned int bit)
{
- set_bit(bit, &unit->vcpu_list->pause_flags);
+ struct vcpu *v;
+
+ for_each_sched_unit_vcpu ( unit, v )
+ set_bit(bit, &v->pause_flags);
}
static inline void sched_clear_pause_flags_atomic(struct sched_unit *unit,
unsigned int bit)
{
- clear_bit(bit, &unit->vcpu_list->pause_flags);
+ struct vcpu *v;
+
+ for_each_sched_unit_vcpu ( unit, v )
+ clear_bit(bit, &v->pause_flags);
}
static inline struct sched_unit *sched_idle_unit(unsigned int cpu)
@@ -458,12 +499,18 @@ static inline int sched_adjust_cpupool(const struct
scheduler *s,
static inline void sched_unit_pause_nosync(struct sched_unit *unit)
{
- vcpu_pause_nosync(unit->vcpu_list);
+ struct vcpu *v;
+
+ for_each_sched_unit_vcpu ( unit, v )
+ vcpu_pause_nosync(v);
}
static inline void sched_unit_unpause(struct sched_unit *unit)
{
- vcpu_unpause(unit->vcpu_list);
+ struct vcpu *v;
+
+ for_each_sched_unit_vcpu ( unit, v )
+ vcpu_unpause(v);
}
#define REGISTER_SCHEDULER(x) static const struct scheduler *x##_entry \
--
2.16.4
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