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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2 16/48] xen/sched: make credit scheduler vcpu agnostic.
Switch credit scheduler completely from vcpu to sched_unit usage.
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
xen/common/sched_credit.c | 503 +++++++++++++++++++++++-----------------------
1 file changed, 250 insertions(+), 253 deletions(-)
diff --git a/xen/common/sched_credit.c b/xen/common/sched_credit.c
index 143c7543e8..60eb4d3244 100644
--- a/xen/common/sched_credit.c
+++ b/xen/common/sched_credit.c
@@ -70,10 +70,10 @@
* inconsistent set of locks. Therefore atomic-safe bit operations must
* be used for accessing it.
*/
-#define CSCHED_FLAG_VCPU_PARKED 0x0 /* VCPU over capped credits */
-#define CSCHED_FLAG_VCPU_YIELD 0x1 /* VCPU yielding */
-#define CSCHED_FLAG_VCPU_MIGRATING 0x2 /* VCPU may have moved to a new pcpu */
-#define CSCHED_FLAG_VCPU_PINNED 0x4 /* VCPU can run only on 1 pcpu */
+#define CSCHED_FLAG_UNIT_PARKED 0x0 /* UNIT over capped credits */
+#define CSCHED_FLAG_UNIT_YIELD 0x1 /* UNIT yielding */
+#define CSCHED_FLAG_UNIT_MIGRATING 0x2 /* UNIT may have moved to a new pcpu */
+#define CSCHED_FLAG_UNIT_PINNED 0x4 /* UNIT can run only on 1 pcpu */
/*
@@ -91,7 +91,7 @@
/*
* CSCHED_STATS
*
- * Manage very basic per-vCPU counters and stats.
+ * Manage very basic per-unit counters and stats.
*
* Useful for debugging live systems. The stats are displayed
* with runq dumps ('r' on the Xen console).
@@ -100,23 +100,23 @@
#define CSCHED_STATS
-#define SCHED_VCPU_STATS_RESET(_V) \
+#define SCHED_UNIT_STATS_RESET(_V) \
do \
{ \
memset(&(_V)->stats, 0, sizeof((_V)->stats)); \
} while ( 0 )
-#define SCHED_VCPU_STAT_CRANK(_V, _X) (((_V)->stats._X)++)
+#define SCHED_UNIT_STAT_CRANK(_V, _X) (((_V)->stats._X)++)
-#define SCHED_VCPU_STAT_SET(_V, _X, _Y) (((_V)->stats._X) = (_Y))
+#define SCHED_UNIT_STAT_SET(_V, _X, _Y) (((_V)->stats._X) = (_Y))
#else /* !SCHED_STATS */
#undef CSCHED_STATS
-#define SCHED_VCPU_STATS_RESET(_V) do {} while ( 0 )
-#define SCHED_VCPU_STAT_CRANK(_V, _X) do {} while ( 0 )
-#define SCHED_VCPU_STAT_SET(_V, _X, _Y) do {} while ( 0 )
+#define SCHED_UNIT_STATS_RESET(_V) do {} while ( 0 )
+#define SCHED_UNIT_STAT_CRANK(_V, _X) do {} while ( 0 )
+#define SCHED_UNIT_STAT_SET(_V, _X, _Y) do {} while ( 0 )
#endif /* SCHED_STATS */
@@ -128,7 +128,7 @@
#define TRC_CSCHED_SCHED_TASKLET TRC_SCHED_CLASS_EVT(CSCHED, 1)
#define TRC_CSCHED_ACCOUNT_START TRC_SCHED_CLASS_EVT(CSCHED, 2)
#define TRC_CSCHED_ACCOUNT_STOP TRC_SCHED_CLASS_EVT(CSCHED, 3)
-#define TRC_CSCHED_STOLEN_VCPU TRC_SCHED_CLASS_EVT(CSCHED, 4)
+#define TRC_CSCHED_STOLEN_UNIT TRC_SCHED_CLASS_EVT(CSCHED, 4)
#define TRC_CSCHED_PICKED_CPU TRC_SCHED_CLASS_EVT(CSCHED, 5)
#define TRC_CSCHED_TICKLE TRC_SCHED_CLASS_EVT(CSCHED, 6)
#define TRC_CSCHED_BOOST_START TRC_SCHED_CLASS_EVT(CSCHED, 7)
@@ -158,15 +158,15 @@ struct csched_pcpu {
};
/*
- * Virtual CPU
+ * Virtual UNIT
*/
struct csched_unit {
struct list_head runq_elem;
- struct list_head active_vcpu_elem;
+ struct list_head active_unit_elem;
/* Up-pointers */
struct csched_dom *sdom;
- struct vcpu *vcpu;
+ struct sched_unit *unit;
s_time_t start_time; /* When we were scheduled (used for credit) */
unsigned flags;
@@ -194,10 +194,10 @@ struct csched_unit {
* Domain
*/
struct csched_dom {
- struct list_head active_vcpu;
+ struct list_head active_unit;
struct list_head active_sdom_elem;
struct domain *dom;
- uint16_t active_vcpu_count;
+ uint16_t active_unit_count;
uint16_t weight;
uint16_t cap;
};
@@ -217,7 +217,7 @@ struct csched_private {
/* Period of master and tick in milliseconds */
unsigned int tick_period_us, ticks_per_tslice;
- s_time_t ratelimit, tslice, vcpu_migr_delay;
+ s_time_t ratelimit, tslice, unit_migr_delay;
struct list_head active_sdom;
uint32_t weight;
@@ -233,7 +233,7 @@ static void csched_tick(void *_cpu);
static void csched_acct(void *dummy);
static inline int
-__vcpu_on_runq(struct csched_unit *svc)
+__unit_on_runq(struct csched_unit *svc)
{
return !list_empty(&svc->runq_elem);
}
@@ -244,7 +244,7 @@ __runq_elem(struct list_head *elem)
return list_entry(elem, struct csched_unit, runq_elem);
}
-/* Is the first element of cpu's runq (if any) cpu's idle vcpu? */
+/* Is the first element of cpu's runq (if any) cpu's idle unit? */
static inline bool_t is_runq_idle(unsigned int cpu)
{
/*
@@ -253,7 +253,7 @@ static inline bool_t is_runq_idle(unsigned int cpu)
ASSERT(spin_is_locked(get_sched_res(cpu)->schedule_lock));
return list_empty(RUNQ(cpu)) ||
- is_idle_vcpu(__runq_elem(RUNQ(cpu)->next)->vcpu);
+ is_idle_unit(__runq_elem(RUNQ(cpu)->next)->unit);
}
static inline void
@@ -275,11 +275,11 @@ dec_nr_runnable(unsigned int cpu)
static inline void
__runq_insert(struct csched_unit *svc)
{
- unsigned int cpu = svc->vcpu->processor;
+ unsigned int cpu = sched_unit_cpu(svc->unit);
const struct list_head * const runq = RUNQ(cpu);
struct list_head *iter;
- BUG_ON( __vcpu_on_runq(svc) );
+ BUG_ON( __unit_on_runq(svc) );
list_for_each( iter, runq )
{
@@ -288,10 +288,10 @@ __runq_insert(struct csched_unit *svc)
break;
}
- /* If the vcpu yielded, try to put it behind one lower-priority
- * runnable vcpu if we can. The next runq_sort will bring it forward
+ /* If the unit yielded, try to put it behind one lower-priority
+ * runnable unit if we can. The next runq_sort will bring it forward
* within 30ms if the queue too long. */
- if ( test_bit(CSCHED_FLAG_VCPU_YIELD, &svc->flags)
+ if ( test_bit(CSCHED_FLAG_UNIT_YIELD, &svc->flags)
&& __runq_elem(iter)->pri > CSCHED_PRI_IDLE )
{
iter=iter->next;
@@ -307,20 +307,20 @@ static inline void
runq_insert(struct csched_unit *svc)
{
__runq_insert(svc);
- inc_nr_runnable(svc->vcpu->processor);
+ inc_nr_runnable(sched_unit_cpu(svc->unit));
}
static inline void
__runq_remove(struct csched_unit *svc)
{
- BUG_ON( !__vcpu_on_runq(svc) );
+ BUG_ON( !__unit_on_runq(svc) );
list_del_init(&svc->runq_elem);
}
static inline void
runq_remove(struct csched_unit *svc)
{
- dec_nr_runnable(svc->vcpu->processor);
+ dec_nr_runnable(sched_unit_cpu(svc->unit));
__runq_remove(svc);
}
@@ -331,7 +331,7 @@ static void burn_credits(struct csched_unit *svc, s_time_t
now)
unsigned int credits;
/* Assert svc is current */
- ASSERT( svc == CSCHED_UNIT(curr_on_cpu(svc->vcpu->processor)) );
+ ASSERT( svc == CSCHED_UNIT(curr_on_cpu(sched_unit_cpu(svc->unit))) );
if ( (delta = now - svc->start_time) <= 0 )
return;
@@ -351,8 +351,8 @@ DEFINE_PER_CPU(unsigned int, last_tickle_cpu);
static inline void __runq_tickle(struct csched_unit *new)
{
- unsigned int cpu = new->vcpu->processor;
- struct sched_unit *unit = new->vcpu->sched_unit;
+ unsigned int cpu = sched_unit_cpu(new->unit);
+ struct sched_unit *unit = new->unit;
struct csched_unit * const cur = CSCHED_UNIT(curr_on_cpu(cpu));
struct csched_private *prv = CSCHED_PRIV(per_cpu(scheduler, cpu));
cpumask_t mask, idle_mask, *online;
@@ -366,16 +366,16 @@ static inline void __runq_tickle(struct csched_unit *new)
idlers_empty = cpumask_empty(&idle_mask);
/*
- * Exclusive pinning is when a vcpu has hard-affinity with only one
- * cpu, and there is no other vcpu that has hard-affinity with that
+ * Exclusive pinning is when a unit has hard-affinity with only one
+ * cpu, and there is no other unit that has hard-affinity with that
* same cpu. This is infrequent, but if it happens, is for achieving
* the most possible determinism, and least possible overhead for
- * the vcpus in question.
+ * the units in question.
*
* Try to identify the vast majority of these situations, and deal
* with them quickly.
*/
- if ( unlikely(test_bit(CSCHED_FLAG_VCPU_PINNED, &new->flags) &&
+ if ( unlikely(test_bit(CSCHED_FLAG_UNIT_PINNED, &new->flags) &&
cpumask_test_cpu(cpu, &idle_mask)) )
{
ASSERT(cpumask_cycle(cpu, unit->cpu_hard_affinity) == cpu);
@@ -386,7 +386,7 @@ static inline void __runq_tickle(struct csched_unit *new)
/*
* If the pcpu is idle, or there are no idlers and the new
- * vcpu is a higher priority than the old vcpu, run it here.
+ * unit is a higher priority than the old unit, run it here.
*
* If there are idle cpus, first try to find one suitable to run
* new, so we can avoid preempting cur. If we cannot find a
@@ -405,7 +405,7 @@ static inline void __runq_tickle(struct csched_unit *new)
else if ( !idlers_empty )
{
/*
- * Soft and hard affinity balancing loop. For vcpus without
+ * Soft and hard affinity balancing loop. For units without
* a useful soft affinity, consider hard affinity only.
*/
for_each_affinity_balance_step( balance_step )
@@ -448,10 +448,10 @@ static inline void __runq_tickle(struct csched_unit *new)
{
if ( cpumask_intersects(unit->cpu_hard_affinity, &idle_mask) )
{
- SCHED_VCPU_STAT_CRANK(cur, kicked_away);
- SCHED_VCPU_STAT_CRANK(cur, migrate_r);
+ SCHED_UNIT_STAT_CRANK(cur, kicked_away);
+ SCHED_UNIT_STAT_CRANK(cur, migrate_r);
SCHED_STAT_CRANK(migrate_kicked_away);
- set_bit(_VPF_migrating, &cur->vcpu->pause_flags);
+ sched_set_pause_flags_atomic(cur->unit, _VPF_migrating);
}
/* Tickle cpu anyway, to let new preempt cur. */
SCHED_STAT_CRANK(tickled_busy_cpu);
@@ -607,7 +607,7 @@ init_pdata(struct csched_private *prv, struct csched_pcpu
*spc, int cpu)
spc->idle_bias = nr_cpu_ids - 1;
/* Start off idling... */
- BUG_ON(!is_idle_vcpu(curr_on_cpu(cpu)->vcpu_list));
+ BUG_ON(!is_idle_unit(curr_on_cpu(cpu)));
cpumask_set_cpu(cpu, prv->idlers);
spc->nr_runnable = 0;
}
@@ -632,9 +632,9 @@ csched_switch_sched(struct scheduler *new_ops, unsigned int
cpu,
struct csched_private *prv = CSCHED_PRIV(new_ops);
struct csched_unit *svc = vdata;
- ASSERT(svc && is_idle_vcpu(svc->vcpu));
+ ASSERT(svc && is_idle_unit(svc->unit));
- idle_vcpu[cpu]->sched_unit->priv = vdata;
+ sched_idle_unit(cpu)->priv = vdata;
/*
* We are holding the runqueue lock already (it's been taken in
@@ -651,33 +651,33 @@ csched_switch_sched(struct scheduler *new_ops, unsigned
int cpu,
#ifndef NDEBUG
static inline void
-__csched_vcpu_check(struct vcpu *vc)
+__csched_unit_check(struct sched_unit *unit)
{
- struct csched_unit * const svc = CSCHED_UNIT(vc->sched_unit);
+ struct csched_unit * const svc = CSCHED_UNIT(unit);
struct csched_dom * const sdom = svc->sdom;
- BUG_ON( svc->vcpu != vc );
- BUG_ON( sdom != CSCHED_DOM(vc->domain) );
+ BUG_ON( svc->unit != unit );
+ BUG_ON( sdom != CSCHED_DOM(unit->domain) );
if ( sdom )
{
- BUG_ON( is_idle_vcpu(vc) );
- BUG_ON( sdom->dom != vc->domain );
+ BUG_ON( is_idle_unit(unit) );
+ BUG_ON( sdom->dom != unit->domain );
}
else
{
- BUG_ON( !is_idle_vcpu(vc) );
+ BUG_ON( !is_idle_unit(unit) );
}
SCHED_STAT_CRANK(unit_check);
}
-#define CSCHED_VCPU_CHECK(_vc) (__csched_vcpu_check(_vc))
+#define CSCHED_UNIT_CHECK(unit) (__csched_unit_check(unit))
#else
-#define CSCHED_VCPU_CHECK(_vc)
+#define CSCHED_UNIT_CHECK(unit)
#endif
/*
- * Delay, in microseconds, between migrations of a VCPU between PCPUs.
- * This prevents rapid fluttering of a VCPU between CPUs, and reduces the
+ * Delay, in microseconds, between migrations of a UNIT between PCPUs.
+ * This prevents rapid fluttering of a UNIT between CPUs, and reduces the
* implicit overheads such as cache-warming. 1ms (1000) has been measured
* as a good value.
*/
@@ -688,8 +688,8 @@ static inline bool
__csched_vcpu_is_cache_hot(const struct csched_private *prv,
const struct csched_unit *svc)
{
- bool hot = prv->vcpu_migr_delay &&
- (NOW() - svc->last_sched_time) < prv->vcpu_migr_delay;
+ bool hot = prv->unit_migr_delay &&
+ (NOW() - svc->last_sched_time) < prv->unit_migr_delay;
if ( hot )
SCHED_STAT_CRANK(unit_hot);
@@ -698,37 +698,39 @@ __csched_vcpu_is_cache_hot(const struct csched_private
*prv,
}
static inline int
-__csched_vcpu_is_migrateable(const struct csched_private *prv, struct vcpu *vc,
+__csched_unit_is_migrateable(const struct csched_private *prv,
+ struct sched_unit *unit,
int dest_cpu, cpumask_t *mask)
{
- const struct csched_unit *svc = CSCHED_UNIT(vc->sched_unit);
+ const struct csched_unit *svc = CSCHED_UNIT(unit);
/*
* Don't pick up work that's hot on peer PCPU, or that can't (or
* would prefer not to) run on cpu.
*
- * The caller is supposed to have already checked that vc is also
+ * The caller is supposed to have already checked that unit is also
* not running.
*/
- ASSERT(!vc->sched_unit->is_running);
+ ASSERT(!unit->is_running);
return !__csched_vcpu_is_cache_hot(prv, svc) &&
cpumask_test_cpu(dest_cpu, mask);
}
static int
-_csched_cpu_pick(const struct scheduler *ops, struct vcpu *vc, bool_t commit)
+_csched_cpu_pick(const struct scheduler *ops, struct sched_unit *unit,
+ bool_t commit)
{
- /* We must always use vc->procssor's scratch space */
- cpumask_t *cpus = cpumask_scratch_cpu(vc->processor);
+ int cpu = sched_unit_cpu(unit);
+ /* We must always use cpu's scratch space */
+ cpumask_t *cpus = cpumask_scratch_cpu(cpu);
cpumask_t idlers;
- cpumask_t *online = cpupool_domain_cpumask(vc->domain);
+ cpumask_t *online = cpupool_domain_cpumask(unit->domain);
struct csched_pcpu *spc = NULL;
- int cpu = vc->processor;
int balance_step;
for_each_affinity_balance_step( balance_step )
{
- affinity_balance_cpumask(vc->sched_unit, balance_step, cpus);
+ affinity_balance_cpumask(unit, balance_step, cpus);
cpumask_and(cpus, online, cpus);
/*
* We want to pick up a pcpu among the ones that are online and
@@ -747,12 +749,13 @@ _csched_cpu_pick(const struct scheduler *ops, struct vcpu
*vc, bool_t commit)
* balancing step all together.
*/
if ( balance_step == BALANCE_SOFT_AFFINITY &&
- (!has_soft_affinity(vc->sched_unit) || cpumask_empty(cpus)) )
+ (!has_soft_affinity(unit) || cpumask_empty(cpus)) )
continue;
/* If present, prefer vc's current processor */
- cpu = cpumask_test_cpu(vc->processor, cpus)
- ? vc->processor : cpumask_cycle(vc->processor, cpus);
+ cpu = cpumask_test_cpu(sched_unit_cpu(unit), cpus)
+ ? sched_unit_cpu(unit)
+ : cpumask_cycle(sched_unit_cpu(unit), cpus);
ASSERT(cpumask_test_cpu(cpu, cpus));
/*
@@ -764,15 +767,15 @@ _csched_cpu_pick(const struct scheduler *ops, struct vcpu
*vc, bool_t commit)
* We give preference to the idle execution vehicle with the most
* idling neighbours in its grouping. This distributes work across
* distinct cores first and guarantees we don't do something stupid
- * like run two VCPUs on co-hyperthreads while there are idle cores
+ * like run two UNITs on co-hyperthreads while there are idle cores
* or sockets.
*
* Notice that, when computing the "idleness" of cpu, we may want to
- * discount vc. That is, iff vc is the currently running and the only
- * runnable vcpu on cpu, we add cpu to the idlers.
+ * discount unit. That is, iff unit is the currently running and the
+ * only runnable unit on cpu, we add cpu to the idlers.
*/
cpumask_and(&idlers, &cpu_online_map, CSCHED_PRIV(ops)->idlers);
- if ( vc->processor == cpu && is_runq_idle(cpu) )
+ if ( sched_unit_cpu(unit) == cpu && is_runq_idle(cpu) )
__cpumask_set_cpu(cpu, &idlers);
cpumask_and(cpus, &idlers, cpus);
@@ -782,7 +785,7 @@ _csched_cpu_pick(const struct scheduler *ops, struct vcpu
*vc, bool_t commit)
* CPU, as we just &&-ed it with idlers). In fact, if we are on SMT,
and
* cpu points to a busy thread with an idle sibling, both the threads
* will be considered the same, from the "idleness" calculation point
- * of view", preventing vcpu from being moved to the thread that is
+ * of view", preventing unit from being moved to the thread that is
* actually idle.
*
* Notice that cpumask_test_cpu() is quicker than cpumask_empty(), so
@@ -848,7 +851,8 @@ _csched_cpu_pick(const struct scheduler *ops, struct vcpu
*vc, bool_t commit)
if ( commit && spc )
spc->idle_bias = cpu;
- TRACE_3D(TRC_CSCHED_PICKED_CPU, vc->domain->domain_id, vc->vcpu_id, cpu);
+ TRACE_3D(TRC_CSCHED_PICKED_CPU, unit->domain->domain_id, unit->unit_id,
+ cpu);
return cpu;
}
@@ -856,7 +860,6 @@ _csched_cpu_pick(const struct scheduler *ops, struct vcpu
*vc, bool_t commit)
static struct sched_resource *
csched_res_pick(const struct scheduler *ops, struct sched_unit *unit)
{
- struct vcpu *vc = unit->vcpu_list;
struct csched_unit *svc = CSCHED_UNIT(unit);
/*
@@ -866,26 +869,26 @@ csched_res_pick(const struct scheduler *ops, struct
sched_unit *unit)
* csched_unit_wake() (still called from vcpu_migrate()) we won't
* get boosted, which we don't deserve as we are "only" migrating.
*/
- set_bit(CSCHED_FLAG_VCPU_MIGRATING, &svc->flags);
- return get_sched_res(_csched_cpu_pick(ops, vc, 1));
+ set_bit(CSCHED_FLAG_UNIT_MIGRATING, &svc->flags);
+ return get_sched_res(_csched_cpu_pick(ops, unit, 1));
}
static inline void
-__csched_vcpu_acct_start(struct csched_private *prv, struct csched_unit *svc)
+__csched_unit_acct_start(struct csched_private *prv, struct csched_unit *svc)
{
struct csched_dom * const sdom = svc->sdom;
unsigned long flags;
spin_lock_irqsave(&prv->lock, flags);
- if ( list_empty(&svc->active_vcpu_elem) )
+ if ( list_empty(&svc->active_unit_elem) )
{
- SCHED_VCPU_STAT_CRANK(svc, state_active);
+ SCHED_UNIT_STAT_CRANK(svc, state_active);
SCHED_STAT_CRANK(acct_unit_active);
- sdom->active_vcpu_count++;
- list_add(&svc->active_vcpu_elem, &sdom->active_vcpu);
- /* Make weight per-vcpu */
+ sdom->active_unit_count++;
+ list_add(&svc->active_unit_elem, &sdom->active_unit);
+ /* Make weight per-unit */
prv->weight += sdom->weight;
if ( list_empty(&sdom->active_sdom_elem) )
{
@@ -894,56 +897,56 @@ __csched_vcpu_acct_start(struct csched_private *prv,
struct csched_unit *svc)
}
TRACE_3D(TRC_CSCHED_ACCOUNT_START, sdom->dom->domain_id,
- svc->vcpu->vcpu_id, sdom->active_vcpu_count);
+ svc->unit->unit_id, sdom->active_unit_count);
spin_unlock_irqrestore(&prv->lock, flags);
}
static inline void
-__csched_vcpu_acct_stop_locked(struct csched_private *prv,
+__csched_unit_acct_stop_locked(struct csched_private *prv,
struct csched_unit *svc)
{
struct csched_dom * const sdom = svc->sdom;
- BUG_ON( list_empty(&svc->active_vcpu_elem) );
+ BUG_ON( list_empty(&svc->active_unit_elem) );
- SCHED_VCPU_STAT_CRANK(svc, state_idle);
+ SCHED_UNIT_STAT_CRANK(svc, state_idle);
SCHED_STAT_CRANK(acct_unit_idle);
BUG_ON( prv->weight < sdom->weight );
- sdom->active_vcpu_count--;
- list_del_init(&svc->active_vcpu_elem);
+ sdom->active_unit_count--;
+ list_del_init(&svc->active_unit_elem);
prv->weight -= sdom->weight;
- if ( list_empty(&sdom->active_vcpu) )
+ if ( list_empty(&sdom->active_unit) )
{
list_del_init(&sdom->active_sdom_elem);
}
TRACE_3D(TRC_CSCHED_ACCOUNT_STOP, sdom->dom->domain_id,
- svc->vcpu->vcpu_id, sdom->active_vcpu_count);
+ svc->unit->unit_id, sdom->active_unit_count);
}
static void
-csched_vcpu_acct(struct csched_private *prv, unsigned int cpu)
+csched_unit_acct(struct csched_private *prv, unsigned int cpu)
{
struct sched_unit *currunit = current->sched_unit;
struct csched_unit * const svc = CSCHED_UNIT(currunit);
const struct scheduler *ops = per_cpu(scheduler, cpu);
- ASSERT( current->processor == cpu );
+ ASSERT( sched_unit_cpu(currunit) == cpu );
ASSERT( svc->sdom != NULL );
- ASSERT( !is_idle_vcpu(svc->vcpu) );
+ ASSERT( !is_idle_unit(svc->unit) );
/*
- * If this VCPU's priority was boosted when it last awoke, reset it.
- * If the VCPU is found here, then it's consuming a non-negligeable
+ * If this UNIT's priority was boosted when it last awoke, reset it.
+ * If the UNIT is found here, then it's consuming a non-negligeable
* amount of CPU resources and should no longer be boosted.
*/
if ( svc->pri == CSCHED_PRI_TS_BOOST )
{
svc->pri = CSCHED_PRI_TS_UNDER;
TRACE_2D(TRC_CSCHED_BOOST_END, svc->sdom->dom->domain_id,
- svc->vcpu->vcpu_id);
+ svc->unit->unit_id);
}
/*
@@ -952,12 +955,12 @@ csched_vcpu_acct(struct csched_private *prv, unsigned int
cpu)
burn_credits(svc, NOW());
/*
- * Put this VCPU and domain back on the active list if it was
+ * Put this UNIT and domain back on the active list if it was
* idling.
*/
- if ( list_empty(&svc->active_vcpu_elem) )
+ if ( list_empty(&svc->active_unit_elem) )
{
- __csched_vcpu_acct_start(prv, svc);
+ __csched_unit_acct_start(prv, svc);
}
else
{
@@ -970,15 +973,15 @@ csched_vcpu_acct(struct csched_private *prv, unsigned int
cpu)
* migrating it to run elsewhere (see multi-core and multi-thread
* support in csched_res_pick()).
*/
- new_cpu = _csched_cpu_pick(ops, current, 0);
+ new_cpu = _csched_cpu_pick(ops, currunit, 0);
unit_schedule_unlock_irqrestore(lock, flags, currunit);
if ( new_cpu != cpu )
{
- SCHED_VCPU_STAT_CRANK(svc, migrate_r);
+ SCHED_UNIT_STAT_CRANK(svc, migrate_r);
SCHED_STAT_CRANK(migrate_running);
- set_bit(_VPF_migrating, ¤t->pause_flags);
+ sched_set_pause_flags_atomic(currunit, _VPF_migrating);
/*
* As we are about to tickle cpu, we should clear its bit in
* idlers. But, if we are here, it means there is someone running
@@ -995,21 +998,20 @@ static void *
csched_alloc_vdata(const struct scheduler *ops, struct sched_unit *unit,
void *dd)
{
- struct vcpu *vc = unit->vcpu_list;
struct csched_unit *svc;
- /* Allocate per-VCPU info */
+ /* Allocate per-UNIT info */
svc = xzalloc(struct csched_unit);
if ( svc == NULL )
return NULL;
INIT_LIST_HEAD(&svc->runq_elem);
- INIT_LIST_HEAD(&svc->active_vcpu_elem);
+ INIT_LIST_HEAD(&svc->active_unit_elem);
svc->sdom = dd;
- svc->vcpu = vc;
- svc->pri = is_idle_domain(vc->domain) ?
+ svc->unit = unit;
+ svc->pri = is_idle_unit(unit) ?
CSCHED_PRI_IDLE : CSCHED_PRI_TS_UNDER;
- SCHED_VCPU_STATS_RESET(svc);
+ SCHED_UNIT_STATS_RESET(svc);
SCHED_STAT_CRANK(unit_alloc);
return svc;
}
@@ -1017,24 +1019,21 @@ csched_alloc_vdata(const struct scheduler *ops, struct
sched_unit *unit,
static void
csched_unit_insert(const struct scheduler *ops, struct sched_unit *unit)
{
- struct vcpu *vc = unit->vcpu_list;
struct csched_unit *svc = unit->priv;
spinlock_t *lock;
- BUG_ON( is_idle_vcpu(vc) );
+ BUG_ON( is_idle_unit(unit) );
/* csched_res_pick() looks in vc->processor's runq, so we need the lock. */
lock = unit_schedule_lock_irq(unit);
- unit->res = csched_res_pick(ops, unit);
- vc->processor = unit->res->processor;
+ sched_set_res(unit, csched_res_pick(ops, unit));
spin_unlock_irq(lock);
lock = unit_schedule_lock_irq(unit);
- if ( !__vcpu_on_runq(svc) && vcpu_runnable(vc) &&
- !vc->sched_unit->is_running )
+ if ( !__unit_on_runq(svc) && unit_runnable(unit) && !unit->is_running )
runq_insert(svc);
unit_schedule_unlock_irq(lock, unit);
@@ -1061,18 +1060,18 @@ csched_unit_remove(const struct scheduler *ops, struct
sched_unit *unit)
SCHED_STAT_CRANK(unit_remove);
- ASSERT(!__vcpu_on_runq(svc));
+ ASSERT(!__unit_on_runq(svc));
- if ( test_and_clear_bit(CSCHED_FLAG_VCPU_PARKED, &svc->flags) )
+ if ( test_and_clear_bit(CSCHED_FLAG_UNIT_PARKED, &svc->flags) )
{
SCHED_STAT_CRANK(unit_unpark);
- vcpu_unpause(svc->vcpu);
+ vcpu_unpause(svc->unit->vcpu_list);
}
spin_lock_irq(&prv->lock);
- if ( !list_empty(&svc->active_vcpu_elem) )
- __csched_vcpu_acct_stop_locked(prv, svc);
+ if ( !list_empty(&svc->active_unit_elem) )
+ __csched_unit_acct_stop_locked(prv, svc);
spin_unlock_irq(&prv->lock);
@@ -1082,86 +1081,85 @@ csched_unit_remove(const struct scheduler *ops, struct
sched_unit *unit)
static void
csched_unit_sleep(const struct scheduler *ops, struct sched_unit *unit)
{
- struct vcpu *vc = unit->vcpu_list;
struct csched_unit * const svc = CSCHED_UNIT(unit);
- unsigned int cpu = vc->processor;
+ unsigned int cpu = sched_unit_cpu(unit);
SCHED_STAT_CRANK(unit_sleep);
- BUG_ON( is_idle_vcpu(vc) );
+ BUG_ON( is_idle_unit(unit) );
if ( curr_on_cpu(cpu) == unit )
{
/*
* We are about to tickle cpu, so we should clear its bit in idlers.
- * But, we are here because vc is going to sleep while running on cpu,
+ * But, we are here because unit is going to sleep while running on
cpu,
* so the bit must be zero already.
*/
ASSERT(!cpumask_test_cpu(cpu, CSCHED_PRIV(per_cpu(scheduler,
cpu))->idlers));
cpu_raise_softirq(cpu, SCHEDULE_SOFTIRQ);
}
- else if ( __vcpu_on_runq(svc) )
+ else if ( __unit_on_runq(svc) )
runq_remove(svc);
}
static void
csched_unit_wake(const struct scheduler *ops, struct sched_unit *unit)
{
- struct vcpu *vc = unit->vcpu_list;
struct csched_unit * const svc = CSCHED_UNIT(unit);
bool_t migrating;
- BUG_ON( is_idle_vcpu(vc) );
+ BUG_ON( is_idle_unit(unit) );
- if ( unlikely(curr_on_cpu(vc->processor) == unit) )
+ if ( unlikely(curr_on_cpu(sched_unit_cpu(unit)) == unit) )
{
SCHED_STAT_CRANK(unit_wake_running);
return;
}
- if ( unlikely(__vcpu_on_runq(svc)) )
+ if ( unlikely(__unit_on_runq(svc)) )
{
SCHED_STAT_CRANK(unit_wake_onrunq);
return;
}
- if ( likely(vcpu_runnable(vc)) )
+ if ( likely(unit_runnable(unit)) )
SCHED_STAT_CRANK(unit_wake_runnable);
else
SCHED_STAT_CRANK(unit_wake_not_runnable);
/*
- * We temporarly boost the priority of awaking VCPUs!
+ * We temporarily boost the priority of awaking UNITs!
*
- * If this VCPU consumes a non negligeable amount of CPU, it
+ * If this UNIT consumes a non negligible amount of CPU, it
* will eventually find itself in the credit accounting code
* path where its priority will be reset to normal.
*
- * If on the other hand the VCPU consumes little CPU and is
+ * If on the other hand the UNIT consumes little CPU and is
* blocking and awoken a lot (doing I/O for example), its
* priority will remain boosted, optimizing it's wake-to-run
* latencies.
*
- * This allows wake-to-run latency sensitive VCPUs to preempt
- * more CPU resource intensive VCPUs without impacting overall
+ * This allows wake-to-run latency sensitive UNITs to preempt
+ * more CPU resource intensive UNITs without impacting overall
* system fairness.
*
* There are two cases, when we don't want to boost:
- * - VCPUs that are waking up after a migration, rather than
+ * - UNITs that are waking up after a migration, rather than
* after having block;
- * - VCPUs of capped domains unpausing after earning credits
+ * - UNITs of capped domains unpausing after earning credits
* they had overspent.
*/
- migrating = test_and_clear_bit(CSCHED_FLAG_VCPU_MIGRATING, &svc->flags);
+ migrating = test_and_clear_bit(CSCHED_FLAG_UNIT_MIGRATING, &svc->flags);
if ( !migrating && svc->pri == CSCHED_PRI_TS_UNDER &&
- !test_bit(CSCHED_FLAG_VCPU_PARKED, &svc->flags) )
+ !test_bit(CSCHED_FLAG_UNIT_PARKED, &svc->flags) )
{
- TRACE_2D(TRC_CSCHED_BOOST_START, vc->domain->domain_id, vc->vcpu_id);
+ TRACE_2D(TRC_CSCHED_BOOST_START, unit->domain->domain_id,
+ unit->unit_id);
SCHED_STAT_CRANK(unit_boost);
svc->pri = CSCHED_PRI_TS_BOOST;
}
- /* Put the VCPU on the runq and tickle CPUs */
+ /* Put the UNIT on the runq and tickle CPUs */
runq_insert(svc);
__runq_tickle(svc);
}
@@ -1172,7 +1170,7 @@ csched_unit_yield(const struct scheduler *ops, struct
sched_unit *unit)
struct csched_unit * const svc = CSCHED_UNIT(unit);
/* Let the scheduler know that this vcpu is trying to yield */
- set_bit(CSCHED_FLAG_VCPU_YIELD, &svc->flags);
+ set_bit(CSCHED_FLAG_UNIT_YIELD, &svc->flags);
}
static int
@@ -1201,8 +1199,8 @@ csched_dom_cntl(
{
if ( !list_empty(&sdom->active_sdom_elem) )
{
- prv->weight -= sdom->weight * sdom->active_vcpu_count;
- prv->weight += op->u.credit.weight * sdom->active_vcpu_count;
+ prv->weight -= sdom->weight * sdom->active_unit_count;
+ prv->weight += op->u.credit.weight * sdom->active_unit_count;
}
sdom->weight = op->u.credit.weight;
}
@@ -1231,9 +1229,9 @@ csched_aff_cntl(const struct scheduler *ops, struct
sched_unit *unit,
/* Are we becoming exclusively pinned? */
if ( cpumask_weight(hard) == 1 )
- set_bit(CSCHED_FLAG_VCPU_PINNED, &svc->flags);
+ set_bit(CSCHED_FLAG_UNIT_PINNED, &svc->flags);
else
- clear_bit(CSCHED_FLAG_VCPU_PINNED, &svc->flags);
+ clear_bit(CSCHED_FLAG_UNIT_PINNED, &svc->flags);
}
static inline void
@@ -1276,14 +1274,14 @@ csched_sys_cntl(const struct scheduler *ops,
else if ( prv->ratelimit && !params->ratelimit_us )
printk(XENLOG_INFO "Disabling context switch rate limiting\n");
prv->ratelimit = MICROSECS(params->ratelimit_us);
- prv->vcpu_migr_delay = MICROSECS(params->vcpu_migr_delay_us);
+ prv->unit_migr_delay = MICROSECS(params->vcpu_migr_delay_us);
spin_unlock_irqrestore(&prv->lock, flags);
/* FALLTHRU */
case XEN_SYSCTL_SCHEDOP_getinfo:
params->tslice_ms = prv->tslice / MILLISECS(1);
params->ratelimit_us = prv->ratelimit / MICROSECS(1);
- params->vcpu_migr_delay_us = prv->vcpu_migr_delay / MICROSECS(1);
+ params->vcpu_migr_delay_us = prv->unit_migr_delay / MICROSECS(1);
rc = 0;
break;
}
@@ -1301,7 +1299,7 @@ csched_alloc_domdata(const struct scheduler *ops, struct
domain *dom)
return ERR_PTR(-ENOMEM);
/* Initialize credit and weight */
- INIT_LIST_HEAD(&sdom->active_vcpu);
+ INIT_LIST_HEAD(&sdom->active_unit);
INIT_LIST_HEAD(&sdom->active_sdom_elem);
sdom->dom = dom;
sdom->weight = CSCHED_DEFAULT_WEIGHT;
@@ -1318,7 +1316,7 @@ csched_free_domdata(const struct scheduler *ops, void
*data)
/*
* This is a O(n) optimized sort of the runq.
*
- * Time-share VCPUs can only be one of two priorities, UNDER or OVER. We walk
+ * Time-share UNITs can only be one of two priorities, UNDER or OVER. We walk
* through the runq and move up any UNDERs that are preceded by OVERS. We
* remember the last UNDER to make the move up operation O(1).
*/
@@ -1371,7 +1369,7 @@ csched_acct(void* dummy)
{
struct csched_private *prv = dummy;
unsigned long flags;
- struct list_head *iter_vcpu, *next_vcpu;
+ struct list_head *iter_unit, *next_unit;
struct list_head *iter_sdom, *next_sdom;
struct csched_unit *svc;
struct csched_dom *sdom;
@@ -1418,26 +1416,26 @@ csched_acct(void* dummy)
sdom = list_entry(iter_sdom, struct csched_dom, active_sdom_elem);
BUG_ON( is_idle_domain(sdom->dom) );
- BUG_ON( sdom->active_vcpu_count == 0 );
+ BUG_ON( sdom->active_unit_count == 0 );
BUG_ON( sdom->weight == 0 );
- BUG_ON( (sdom->weight * sdom->active_vcpu_count) > weight_left );
+ BUG_ON( (sdom->weight * sdom->active_unit_count) > weight_left );
- weight_left -= ( sdom->weight * sdom->active_vcpu_count );
+ weight_left -= ( sdom->weight * sdom->active_unit_count );
/*
* A domain's fair share is computed using its weight in competition
* with that of all other active domains.
*
- * At most, a domain can use credits to run all its active VCPUs
+ * At most, a domain can use credits to run all its active UNITs
* for one full accounting period. We allow a domain to earn more
* only when the system-wide credit balance is negative.
*/
- credit_peak = sdom->active_vcpu_count * prv->credits_per_tslice;
+ credit_peak = sdom->active_unit_count * prv->credits_per_tslice;
if ( prv->credit_balance < 0 )
{
credit_peak += ( ( -prv->credit_balance
* sdom->weight
- * sdom->active_vcpu_count) +
+ * sdom->active_unit_count) +
(weight_total - 1)
) / weight_total;
}
@@ -1448,14 +1446,14 @@ csched_acct(void* dummy)
if ( credit_cap < credit_peak )
credit_peak = credit_cap;
- /* FIXME -- set cap per-vcpu as well...? */
- credit_cap = ( credit_cap + ( sdom->active_vcpu_count - 1 )
- ) / sdom->active_vcpu_count;
+ /* FIXME -- set cap per-unit as well...? */
+ credit_cap = ( credit_cap + ( sdom->active_unit_count - 1 )
+ ) / sdom->active_unit_count;
}
credit_fair = ( ( credit_total
* sdom->weight
- * sdom->active_vcpu_count )
+ * sdom->active_unit_count )
+ (weight_total - 1)
) / weight_total;
@@ -1489,14 +1487,14 @@ csched_acct(void* dummy)
credit_fair = credit_peak;
}
- /* Compute fair share per VCPU */
- credit_fair = ( credit_fair + ( sdom->active_vcpu_count - 1 )
- ) / sdom->active_vcpu_count;
+ /* Compute fair share per UNIT */
+ credit_fair = ( credit_fair + ( sdom->active_unit_count - 1 )
+ ) / sdom->active_unit_count;
- list_for_each_safe( iter_vcpu, next_vcpu, &sdom->active_vcpu )
+ list_for_each_safe( iter_unit, next_unit, &sdom->active_unit )
{
- svc = list_entry(iter_vcpu, struct csched_unit, active_vcpu_elem);
+ svc = list_entry(iter_unit, struct csched_unit, active_unit_elem);
BUG_ON( sdom != svc->sdom );
/* Increment credit */
@@ -1504,20 +1502,20 @@ csched_acct(void* dummy)
credit = atomic_read(&svc->credit);
/*
- * Recompute priority or, if VCPU is idling, remove it from
+ * Recompute priority or, if UNIT is idling, remove it from
* the active list.
*/
if ( credit < 0 )
{
svc->pri = CSCHED_PRI_TS_OVER;
- /* Park running VCPUs of capped-out domains */
+ /* Park running UNITs of capped-out domains */
if ( sdom->cap != 0U &&
credit < -credit_cap &&
- !test_and_set_bit(CSCHED_FLAG_VCPU_PARKED, &svc->flags) )
+ !test_and_set_bit(CSCHED_FLAG_UNIT_PARKED, &svc->flags) )
{
SCHED_STAT_CRANK(unit_park);
- vcpu_pause_nosync(svc->vcpu);
+ vcpu_pause_nosync(svc->unit->vcpu_list);
}
/* Lower bound on credits */
@@ -1533,22 +1531,22 @@ csched_acct(void* dummy)
svc->pri = CSCHED_PRI_TS_UNDER;
/* Unpark any capped domains whose credits go positive */
- if ( test_bit(CSCHED_FLAG_VCPU_PARKED, &svc->flags) )
+ if ( test_bit(CSCHED_FLAG_UNIT_PARKED, &svc->flags) )
{
/*
* It's important to unset the flag AFTER the unpause()
- * call to make sure the VCPU's priority is not boosted
+ * call to make sure the UNIT's priority is not boosted
* if it is woken up here.
*/
SCHED_STAT_CRANK(unit_unpark);
- vcpu_unpause(svc->vcpu);
- clear_bit(CSCHED_FLAG_VCPU_PARKED, &svc->flags);
+ vcpu_unpause(svc->unit->vcpu_list);
+ clear_bit(CSCHED_FLAG_UNIT_PARKED, &svc->flags);
}
- /* Upper bound on credits means VCPU stops earning */
+ /* Upper bound on credits means UNIT stops earning */
if ( credit > prv->credits_per_tslice )
{
- __csched_vcpu_acct_stop_locked(prv, svc);
+ __csched_unit_acct_stop_locked(prv, svc);
/* Divide credits in half, so that when it starts
* accounting again, it starts a little bit "ahead" */
credit /= 2;
@@ -1556,8 +1554,8 @@ csched_acct(void* dummy)
}
}
- SCHED_VCPU_STAT_SET(svc, credit_last, credit);
- SCHED_VCPU_STAT_SET(svc, credit_incr, credit_fair);
+ SCHED_UNIT_STAT_SET(svc, credit_last, credit);
+ SCHED_UNIT_STAT_SET(svc, credit_incr, credit_fair);
credit_balance += credit;
}
}
@@ -1583,10 +1581,10 @@ csched_tick(void *_cpu)
spc->tick++;
/*
- * Accounting for running VCPU
+ * Accounting for running UNIT
*/
- if ( !is_idle_vcpu(current) )
- csched_vcpu_acct(prv, cpu);
+ if ( !is_idle_unit(current->sched_unit) )
+ csched_unit_acct(prv, cpu);
/*
* Check if runq needs to be sorted
@@ -1607,7 +1605,7 @@ csched_runq_steal(int peer_cpu, int cpu, int pri, int
balance_step)
const struct csched_pcpu * const peer_pcpu = CSCHED_PCPU(peer_cpu);
struct csched_unit *speer;
struct list_head *iter;
- struct vcpu *vc;
+ struct sched_unit *unit;
ASSERT(peer_pcpu != NULL);
@@ -1615,7 +1613,7 @@ csched_runq_steal(int peer_cpu, int cpu, int pri, int
balance_step)
* Don't steal from an idle CPU's runq because it's about to
* pick up work from it itself.
*/
- if ( unlikely(is_idle_vcpu(curr_on_cpu(peer_cpu)->vcpu_list)) )
+ if ( unlikely(is_idle_unit(curr_on_cpu(peer_cpu))) )
goto out;
list_for_each( iter, &peer_pcpu->runq )
@@ -1623,46 +1621,44 @@ csched_runq_steal(int peer_cpu, int cpu, int pri, int
balance_step)
speer = __runq_elem(iter);
/*
- * If next available VCPU here is not of strictly higher
+ * If next available UNIT here is not of strictly higher
* priority than ours, this PCPU is useless to us.
*/
if ( speer->pri <= pri )
break;
- /* Is this VCPU runnable on our PCPU? */
- vc = speer->vcpu;
- BUG_ON( is_idle_vcpu(vc) );
+ /* Is this UNIT runnable on our PCPU? */
+ unit = speer->unit;
+ BUG_ON( is_idle_unit(unit) );
/*
- * If the vcpu is still in peer_cpu's scheduling tail, or if it
+ * If the unit is still in peer_cpu's scheduling tail, or if it
* has no useful soft affinity, skip it.
*
* In fact, what we want is to check if we have any "soft-affine
* work" to steal, before starting to look at "hard-affine work".
*
- * Notice that, if not even one vCPU on this runq has a useful
+ * Notice that, if not even one unit on this runq has a useful
* soft affinity, we could have avoid considering this runq for
* a soft balancing step in the first place. This, for instance,
* can be implemented by taking note of on what runq there are
- * vCPUs with useful soft affinities in some sort of bitmap
+ * units with useful soft affinities in some sort of bitmap
* or counter.
*/
- if ( vc->sched_unit->is_running ||
- (balance_step == BALANCE_SOFT_AFFINITY &&
- !has_soft_affinity(vc->sched_unit)) )
+ if ( unit->is_running || (balance_step == BALANCE_SOFT_AFFINITY &&
+ !has_soft_affinity(unit)) )
continue;
- affinity_balance_cpumask(vc->sched_unit, balance_step,
cpumask_scratch);
- if ( __csched_vcpu_is_migrateable(prv, vc, cpu, cpumask_scratch) )
+ affinity_balance_cpumask(unit, balance_step, cpumask_scratch);
+ if ( __csched_unit_is_migrateable(prv, unit, cpu, cpumask_scratch) )
{
/* We got a candidate. Grab it! */
- TRACE_3D(TRC_CSCHED_STOLEN_VCPU, peer_cpu,
- vc->domain->domain_id, vc->vcpu_id);
- SCHED_VCPU_STAT_CRANK(speer, migrate_q);
+ TRACE_3D(TRC_CSCHED_STOLEN_UNIT, peer_cpu,
+ unit->domain->domain_id, unit->unit_id);
+ SCHED_UNIT_STAT_CRANK(speer, migrate_q);
SCHED_STAT_CRANK(migrate_queued);
- WARN_ON(vc->is_urgent);
runq_remove(speer);
- sched_set_res(vc->sched_unit, get_sched_res(cpu));
+ sched_set_res(unit, get_sched_res(cpu));
/*
* speer will start executing directly on cpu, without having to
* go through runq_insert(). So we must update the runnable count
@@ -1688,7 +1684,7 @@ 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 != snext->vcpu->processor );
+ BUG_ON( cpu != sched_unit_cpu(snext->unit) );
online = cpupool_online_cpumask(c);
/*
@@ -1717,7 +1713,7 @@ csched_load_balance(struct csched_private *prv, int cpu,
/*
* We peek at the non-idling CPUs in a node-wise fashion. In fact,
* it is more likely that we find some affine work on our same
- * node, not to mention that migrating vcpus within the same node
+ * node, not to mention that migrating units within the same node
* could well expected to be cheaper than across-nodes (memory
* stays local, there might be some node-wide cache[s], etc.).
*/
@@ -1738,7 +1734,7 @@ csched_load_balance(struct csched_private *prv, int cpu,
spinlock_t *lock;
/*
- * If there is only one runnable vCPU on peer_cpu, it means
+ * If there is only one runnable unit on peer_cpu, it means
* there's no one to be stolen in its runqueue, so skip it.
*
* Checking this without holding the lock is racy... But that's
@@ -1751,13 +1747,13 @@ csched_load_balance(struct csched_private *prv, int cpu,
* And we can avoid that by re-checking nr_runnable after
* having grabbed the lock, if we want;
* - if we race with inc_nr_runnable(), we skip a pCPU that may
- * have runnable vCPUs in its runqueue, but that's not a
+ * have runnable units in its runqueue, but that's not a
* problem because:
* + if racing with csched_unit_insert() or
csched_unit_wake(),
- * __runq_tickle() will be called afterwords, so the vCPU
+ * __runq_tickle() will be called afterwords, so the unit
* won't get stuck in the runqueue for too long;
- * + if racing with csched_runq_steal(), it may be that a
- * vCPU that we could have picked up, stays in a runqueue
+ * + if racing with csched_runq_steal(), it may be that an
+ * unit that we could have picked up, stays in a runqueue
* until someone else tries to steal it again. But this is
* no worse than what can happen already (without this
* optimization), it the pCPU would schedule right after we
@@ -1792,7 +1788,7 @@ csched_load_balance(struct csched_private *prv, int cpu,
csched_runq_steal(peer_cpu, cpu, snext->pri, bstep) : NULL;
pcpu_schedule_unlock(lock, peer_cpu);
- /* As soon as one vcpu is found, balancing ends */
+ /* As soon as one unit is found, balancing ends */
if ( speer != NULL )
{
*stolen = 1;
@@ -1831,14 +1827,15 @@ csched_schedule(
{
const int cpu = smp_processor_id();
struct list_head * const runq = RUNQ(cpu);
- struct csched_unit * const scurr = CSCHED_UNIT(current->sched_unit);
+ struct sched_unit *unit = current->sched_unit;
+ struct csched_unit * const scurr = CSCHED_UNIT(unit);
struct csched_private *prv = CSCHED_PRIV(ops);
struct csched_unit *snext;
struct task_slice ret;
s_time_t runtime, tslice;
SCHED_STAT_CRANK(schedule);
- CSCHED_VCPU_CHECK(current);
+ CSCHED_UNIT_CHECK(unit);
/*
* Here in Credit1 code, we usually just call TRACE_nD() helpers, and
@@ -1852,31 +1849,31 @@ csched_schedule(
} d;
d.cpu = cpu;
d.tasklet = tasklet_work_scheduled;
- d.idle = is_idle_vcpu(current);
+ d.idle = is_idle_unit(unit);
__trace_var(TRC_CSCHED_SCHEDULE, 1, sizeof(d),
(unsigned char *)&d);
}
- runtime = now - current->sched_unit->state_entry_time;
+ runtime = now - unit->state_entry_time;
if ( runtime < 0 ) /* Does this ever happen? */
runtime = 0;
- if ( !is_idle_vcpu(scurr->vcpu) )
+ if ( !is_idle_unit(unit) )
{
- /* Update credits of a non-idle VCPU. */
+ /* Update credits of a non-idle UNIT. */
burn_credits(scurr, now);
scurr->start_time -= now;
scurr->last_sched_time = now;
}
else
{
- /* Re-instate a boosted idle VCPU as normal-idle. */
+ /* Re-instate a boosted idle UNIT as normal-idle. */
scurr->pri = CSCHED_PRI_IDLE;
}
/* Choices, choices:
- * - If we have a tasklet, we need to run the idle vcpu no matter what.
- * - If sched rate limiting is in effect, and the current vcpu has
+ * - If we have a tasklet, we need to run the idle unit no matter what.
+ * - If sched rate limiting is in effect, and the current unit has
* run for less than that amount of time, continue the current one,
* but with a shorter timeslice and return it immediately
* - Otherwise, chose the one with the highest priority (which may
@@ -1894,11 +1891,11 @@ csched_schedule(
* In fact, it may be the case that scurr is about to spin, and there's
* no point forcing it to do so until rate limiting expires.
*/
- if ( !test_bit(CSCHED_FLAG_VCPU_YIELD, &scurr->flags)
+ if ( !test_bit(CSCHED_FLAG_UNIT_YIELD, &scurr->flags)
&& !tasklet_work_scheduled
&& prv->ratelimit
- && vcpu_runnable(current)
- && !is_idle_vcpu(current)
+ && unit_runnable(unit)
+ && !is_idle_unit(unit)
&& runtime < prv->ratelimit )
{
snext = scurr;
@@ -1916,11 +1913,11 @@ csched_schedule(
if ( unlikely(tb_init_done) )
{
struct {
- unsigned vcpu:16, dom:16;
+ unsigned unit:16, dom:16;
unsigned runtime;
} d;
- d.dom = scurr->vcpu->domain->domain_id;
- d.vcpu = scurr->vcpu->vcpu_id;
+ d.dom = unit->domain->domain_id;
+ d.unit = unit->unit_id;
d.runtime = runtime;
__trace_var(TRC_CSCHED_RATELIMIT, 1, sizeof(d),
(unsigned char *)&d);
@@ -1932,13 +1929,13 @@ csched_schedule(
tslice = prv->tslice;
/*
- * Select next runnable local VCPU (ie top of local runq)
+ * Select next runnable local UNIT (ie top of local runq)
*/
- if ( vcpu_runnable(current) )
+ if ( unit_runnable(unit) )
__runq_insert(scurr);
else
{
- BUG_ON( is_idle_vcpu(current) || list_empty(runq) );
+ BUG_ON( is_idle_unit(unit) || list_empty(runq) );
/* Current has blocked. Update the runnable counter for this cpu. */
dec_nr_runnable(cpu);
}
@@ -1946,23 +1943,23 @@ csched_schedule(
snext = __runq_elem(runq->next);
ret.migrated = 0;
- /* Tasklet work (which runs in idle VCPU context) overrides all else. */
+ /* Tasklet work (which runs in idle UNIT context) overrides all else. */
if ( tasklet_work_scheduled )
{
TRACE_0D(TRC_CSCHED_SCHED_TASKLET);
- snext = CSCHED_UNIT(idle_vcpu[cpu]->sched_unit);
+ snext = CSCHED_UNIT(sched_idle_unit(cpu));
snext->pri = CSCHED_PRI_TS_BOOST;
}
/*
* Clear YIELD flag before scheduling out
*/
- clear_bit(CSCHED_FLAG_VCPU_YIELD, &scurr->flags);
+ clear_bit(CSCHED_FLAG_UNIT_YIELD, &scurr->flags);
/*
* SMP Load balance:
*
- * If the next highest priority local runnable VCPU has already eaten
+ * If the next highest priority local runnable UNIT has already eaten
* through its credits, look on other PCPUs to see if we have more
* urgent work... If not, csched_load_balance() will return snext, but
* already removed from the runq.
@@ -1986,32 +1983,32 @@ csched_schedule(
cpumask_clear_cpu(cpu, prv->idlers);
}
- if ( !is_idle_vcpu(snext->vcpu) )
+ if ( !is_idle_unit(snext->unit) )
snext->start_time += now;
out:
/*
* Return task to run next...
*/
- ret.time = (is_idle_vcpu(snext->vcpu) ?
+ ret.time = (is_idle_unit(snext->unit) ?
-1 : tslice);
- ret.task = snext->vcpu->sched_unit;
+ ret.task = snext->unit;
- CSCHED_VCPU_CHECK(ret.task->vcpu_list);
+ CSCHED_UNIT_CHECK(ret.task);
return ret;
}
static void
-csched_dump_vcpu(struct csched_unit *svc)
+csched_dump_unit(struct csched_unit *svc)
{
struct csched_dom * const sdom = svc->sdom;
printk("[%i.%i] pri=%i flags=%x cpu=%i",
- svc->vcpu->domain->domain_id,
- svc->vcpu->vcpu_id,
+ svc->unit->domain->domain_id,
+ svc->unit->unit_id,
svc->pri,
svc->flags,
- svc->vcpu->processor);
+ sched_unit_cpu(svc->unit));
if ( sdom )
{
@@ -2045,7 +2042,7 @@ csched_dump_pcpu(const struct scheduler *ops, int cpu)
/*
* We need both locks:
- * - csched_dump_vcpu() wants to access domains' scheduling
+ * - csched_dump_unit() wants to access domains' scheduling
* parameters, which are protected by the private scheduler lock;
* - we scan through the runqueue, so we need the proper runqueue
* lock (the one of the runqueue of this cpu).
@@ -2061,12 +2058,12 @@ csched_dump_pcpu(const struct scheduler *ops, int cpu)
CPUMASK_PR(per_cpu(cpu_sibling_mask, cpu)),
CPUMASK_PR(per_cpu(cpu_core_mask, cpu)));
- /* current VCPU (nothing to say if that's the idle vcpu). */
+ /* current UNIT (nothing to say if that's the idle unit). */
svc = CSCHED_UNIT(curr_on_cpu(cpu));
- if ( svc && !is_idle_vcpu(svc->vcpu) )
+ if ( svc && !is_idle_unit(svc->unit) )
{
printk("\trun: ");
- csched_dump_vcpu(svc);
+ csched_dump_unit(svc);
}
loop = 0;
@@ -2076,7 +2073,7 @@ csched_dump_pcpu(const struct scheduler *ops, int cpu)
if ( svc )
{
printk("\t%3d: ", ++loop);
- csched_dump_vcpu(svc);
+ csched_dump_unit(svc);
}
}
@@ -2118,29 +2115,29 @@ csched_dump(const struct scheduler *ops)
prv->ratelimit / MICROSECS(1),
CSCHED_CREDITS_PER_MSEC,
prv->ticks_per_tslice,
- prv->vcpu_migr_delay/ MICROSECS(1));
+ prv->unit_migr_delay/ MICROSECS(1));
printk("idlers: %*pb\n", CPUMASK_PR(prv->idlers));
- printk("active vcpus:\n");
+ printk("active units:\n");
loop = 0;
list_for_each( iter_sdom, &prv->active_sdom )
{
struct csched_dom *sdom;
sdom = list_entry(iter_sdom, struct csched_dom, active_sdom_elem);
- list_for_each( iter_svc, &sdom->active_vcpu )
+ list_for_each( iter_svc, &sdom->active_unit )
{
struct csched_unit *svc;
spinlock_t *lock;
- svc = list_entry(iter_svc, struct csched_unit, active_vcpu_elem);
- lock = unit_schedule_lock(svc->vcpu->sched_unit);
+ svc = list_entry(iter_svc, struct csched_unit, active_unit_elem);
+ lock = unit_schedule_lock(svc->unit);
printk("\t%3d: ", ++loop);
- csched_dump_vcpu(svc);
+ csched_dump_unit(svc);
- unit_schedule_unlock(lock, svc->vcpu->sched_unit);
+ unit_schedule_unlock(lock, svc->unit);
}
}
@@ -2214,7 +2211,7 @@ csched_init(struct scheduler *ops)
else
prv->ratelimit = MICROSECS(sched_ratelimit_us);
- prv->vcpu_migr_delay = MICROSECS(vcpu_migration_delay_us);
+ prv->unit_migr_delay = MICROSECS(vcpu_migration_delay_us);
return 0;
}
--
2.16.4
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