From: Juergen Gross <jgross@suse.com>
To: xen-devel@lists.xenproject.org
Cc: Juergen Gross <jgross@suse.com>, Tim Deegan <tim@xen.org>,
Stefano Stabellini <sstabellini@kernel.org>, Wei Liu <wl@xen.org>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
George Dunlap <george.dunlap@eu.citrix.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Ian Jackson <ian.jackson@eu.citrix.com>,
Dario Faggioli <dfaggioli@suse.com>,
Julien Grall <julien.grall@arm.com>,
Meng Xu <mengxu@cis.upenn.edu>, Jan Beulich <jbeulich@suse.com>
Subject: [Xen-devel] [PATCH v2 04/48] xen/sched: introduce struct sched_resource
Date: Fri, 9 Aug 2019 16:57:49 +0200 [thread overview]
Message-ID: <20190809145833.1020-5-jgross@suse.com> (raw)
In-Reply-To: <20190809145833.1020-1-jgross@suse.com>
Add a scheduling abstraction layer between physical processors and the
schedulers by introducing a struct sched_resource. Each scheduler unit
running is active on such a scheduler resource. For the time being
there is one struct sched_resource per cpu, but in future there might
be one for each core or socket only.
Signed-off-by: Juergen Gross <jgross@suse.com>
---
V1:
- add accessor functions
- use DEFINE_PER_CPU_READ_MOSTLY (Dario Faggioli)
---
xen/common/sched_credit.c | 2 ++
xen/common/sched_credit2.c | 7 +++++++
xen/common/sched_null.c | 3 +++
xen/common/sched_rt.c | 2 ++
xen/common/schedule.c | 19 ++++++++++++++++++-
xen/include/xen/sched-if.h | 18 ++++++++++++++++++
xen/include/xen/sched.h | 3 +++
7 files changed, 53 insertions(+), 1 deletion(-)
diff --git a/xen/common/sched_credit.c b/xen/common/sched_credit.c
index e835a4930a..c3446551cc 100644
--- a/xen/common/sched_credit.c
+++ b/xen/common/sched_credit.c
@@ -1026,6 +1026,7 @@ csched_unit_insert(const struct scheduler *ops, struct sched_unit *unit)
lock = vcpu_schedule_lock_irq(vc);
vc->processor = csched_cpu_pick(ops, unit);
+ unit->res = get_sched_res(vc->processor);
spin_unlock_irq(lock);
@@ -1662,6 +1663,7 @@ csched_runq_steal(int peer_cpu, int cpu, int pri, int balance_step)
WARN_ON(vc->is_urgent);
runq_remove(speer);
vc->processor = cpu;
+ vc->sched_unit->res = 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
diff --git a/xen/common/sched_credit2.c b/xen/common/sched_credit2.c
index a2403e4198..f7e5f07c7f 100644
--- a/xen/common/sched_credit2.c
+++ b/xen/common/sched_credit2.c
@@ -2520,6 +2520,7 @@ static void migrate(const struct scheduler *ops,
&trqd->active);
svc->vcpu->processor = cpumask_cycle(trqd->pick_bias,
cpumask_scratch_cpu(cpu));
+ svc->vcpu->sched_unit->res = get_sched_res(svc->vcpu->processor);
trqd->pick_bias = svc->vcpu->processor;
ASSERT(svc->vcpu->processor < nr_cpu_ids);
@@ -2775,6 +2776,7 @@ csched2_unit_migrate(
}
_runq_deassign(svc);
vc->processor = new_cpu;
+ unit->res = get_sched_res(new_cpu);
return;
}
@@ -2795,7 +2797,10 @@ csched2_unit_migrate(
if ( trqd != svc->rqd )
migrate(ops, svc, trqd, now);
else
+ {
vc->processor = new_cpu;
+ unit->res = get_sched_res(new_cpu);
+ }
}
static int
@@ -3120,6 +3125,7 @@ csched2_unit_insert(const struct scheduler *ops, struct sched_unit *unit)
lock = vcpu_schedule_lock_irq(vc);
vc->processor = csched2_cpu_pick(ops, unit);
+ unit->res = get_sched_res(vc->processor);
spin_unlock_irq(lock);
@@ -3597,6 +3603,7 @@ csched2_schedule(
{
snext->credit += CSCHED2_MIGRATE_COMPENSATION;
snext->vcpu->processor = cpu;
+ snext->vcpu->sched_unit->res = get_sched_res(cpu);
SCHED_STAT_CRANK(migrated);
ret.migrated = 1;
}
diff --git a/xen/common/sched_null.c b/xen/common/sched_null.c
index bdba237982..27c859b684 100644
--- a/xen/common/sched_null.c
+++ b/xen/common/sched_null.c
@@ -337,6 +337,7 @@ static void vcpu_assign(struct null_private *prv, struct vcpu *v,
per_cpu(npc, cpu).vcpu = v;
v->processor = cpu;
+ v->sched_unit->res = get_sched_res(cpu);
cpumask_clear_cpu(cpu, &prv->cpus_free);
dprintk(XENLOG_G_INFO, "%d <-- %pv\n", cpu, v);
@@ -457,6 +458,7 @@ static void null_unit_insert(const struct scheduler *ops,
retry:
cpu = v->processor = pick_cpu(prv, v);
+ unit->res = get_sched_res(cpu);
spin_unlock(lock);
@@ -748,6 +750,7 @@ static void null_unit_migrate(const struct scheduler *ops,
*/
out:
v->processor = new_cpu;
+ unit->res = get_sched_res(new_cpu);
}
#ifndef NDEBUG
diff --git a/xen/common/sched_rt.c b/xen/common/sched_rt.c
index 0f97c0f2a5..7e622101a4 100644
--- a/xen/common/sched_rt.c
+++ b/xen/common/sched_rt.c
@@ -893,6 +893,7 @@ rt_unit_insert(const struct scheduler *ops, struct sched_unit *unit)
/* This is safe because vc isn't yet being scheduled */
vc->processor = rt_cpu_pick(ops, unit);
+ unit->res = get_sched_res(vc->processor);
lock = vcpu_schedule_lock_irq(vc);
@@ -1123,6 +1124,7 @@ rt_schedule(const struct scheduler *ops, s_time_t now, bool_t tasklet_work_sched
if ( snext->vcpu->processor != cpu )
{
snext->vcpu->processor = cpu;
+ snext->vcpu->sched_unit->res = get_sched_res(cpu);
ret.migrated = 1;
}
ret.time = snext->cur_budget; /* invoke the scheduler next time */
diff --git a/xen/common/schedule.c b/xen/common/schedule.c
index 6da237110e..f5427cf29b 100644
--- a/xen/common/schedule.c
+++ b/xen/common/schedule.c
@@ -67,6 +67,7 @@ static void poll_timer_fn(void *data);
/* This is global for now so that private implementations can reach it */
DEFINE_PER_CPU(struct schedule_data, schedule_data);
DEFINE_PER_CPU(struct scheduler *, scheduler);
+DEFINE_PER_CPU_READ_MOSTLY(struct sched_resource *, sched_res);
/* Scratch space for cpumasks. */
DEFINE_PER_CPU(cpumask_t, cpumask_scratch);
@@ -89,7 +90,7 @@ sched_idle_switch_sched(struct scheduler *new_ops, unsigned int cpu,
static int
sched_idle_cpu_pick(const struct scheduler *ops, struct sched_unit *unit)
{
- return unit->vcpu_list->processor;
+ return unit->res->processor;
}
static void *
@@ -363,6 +364,7 @@ int sched_init_vcpu(struct vcpu *v, unsigned int processor)
if ( (unit = sched_alloc_unit(v)) == NULL )
return 1;
+ unit->res = get_sched_res(processor);
/* Initialise the per-vcpu timers. */
init_timer(&v->periodic_timer, vcpu_periodic_timer_fn,
v, v->processor);
@@ -477,6 +479,7 @@ int sched_move_domain(struct domain *d, struct cpupool *c)
sched_set_affinity(v, &cpumask_all, &cpumask_all);
v->processor = new_p;
+ v->sched_unit->res = get_sched_res(new_p);
/*
* With v->processor modified we must not
* - make any further changes assuming we hold the scheduler lock,
@@ -847,12 +850,14 @@ void restore_vcpu_affinity(struct domain *d)
}
v->processor = cpumask_any(cpumask_scratch_cpu(cpu));
+ v->sched_unit->res = get_sched_res(v->processor);
spin_unlock_irq(lock);
/* v->processor might have changed, so reacquire the lock. */
lock = vcpu_schedule_lock_irq(v);
v->processor = sched_pick_cpu(vcpu_scheduler(v), v->sched_unit);
+ v->sched_unit->res = get_sched_res(v->processor);
spin_unlock_irq(lock);
if ( old_cpu != v->processor )
@@ -1702,6 +1707,13 @@ static void poll_timer_fn(void *data)
static int cpu_schedule_up(unsigned int cpu)
{
struct schedule_data *sd = &per_cpu(schedule_data, cpu);
+ struct sched_resource *res;
+
+ res = xzalloc(struct sched_resource);
+ if ( res == NULL )
+ return -ENOMEM;
+ res->processor = cpu;
+ set_sched_res(cpu, res);
per_cpu(scheduler, cpu) = &sched_idle_ops;
spin_lock_init(&sd->_lock);
@@ -1715,6 +1727,8 @@ static int cpu_schedule_up(unsigned int cpu)
if ( idle_vcpu[cpu] == NULL )
vcpu_create(idle_vcpu[0]->domain, cpu, cpu);
+ else
+ idle_vcpu[cpu]->sched_unit->res = res;
if ( idle_vcpu[cpu] == NULL )
return -ENOMEM;
@@ -1737,6 +1751,9 @@ static void cpu_schedule_down(unsigned int cpu)
struct schedule_data *sd = &per_cpu(schedule_data, cpu);
kill_timer(&sd->s_timer);
+
+ set_sched_res(cpu, NULL);
+ xfree(sd);
}
void sched_rm_cpu(unsigned int cpu)
diff --git a/xen/include/xen/sched-if.h b/xen/include/xen/sched-if.h
index 9fd367377a..f30dc4cdf1 100644
--- a/xen/include/xen/sched-if.h
+++ b/xen/include/xen/sched-if.h
@@ -44,9 +44,24 @@ struct schedule_data {
#define curr_on_cpu(c) (per_cpu(schedule_data, c).curr)
+struct sched_resource {
+ unsigned int processor;
+};
+
DECLARE_PER_CPU(struct schedule_data, schedule_data);
DECLARE_PER_CPU(struct scheduler *, scheduler);
DECLARE_PER_CPU(struct cpupool *, cpupool);
+DECLARE_PER_CPU(struct sched_resource *, sched_res);
+
+static inline struct sched_resource *get_sched_res(unsigned int cpu)
+{
+ return per_cpu(sched_res, cpu);
+}
+
+static inline void set_sched_res(unsigned int cpu, struct sched_resource *res)
+{
+ per_cpu(sched_res, cpu) = res;
+}
/*
* Scratch space, for avoiding having too many cpumask_t on the stack.
@@ -334,7 +349,10 @@ static inline void sched_migrate(const struct scheduler *s,
if ( s->migrate )
s->migrate(s, unit, cpu);
else
+ {
unit->vcpu_list->processor = cpu;
+ unit->res = get_sched_res(cpu);
+ }
}
static inline int sched_pick_cpu(const struct scheduler *s,
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index d7d9e153f9..2ab1b13c63 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -273,11 +273,14 @@ struct vcpu
struct arch_vcpu arch;
};
+struct sched_resource;
+
struct sched_unit {
struct domain *domain;
struct vcpu *vcpu_list;
void *priv; /* scheduler private data */
struct sched_unit *next_in_list;
+ struct sched_resource *res;
int unit_id;
};
--
2.16.4
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next prev parent reply other threads:[~2019-08-09 14:59 UTC|newest]
Thread overview: 126+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-09 14:57 [Xen-devel] [PATCH v2 00/48] xen: add core scheduling support Juergen Gross
2019-08-09 14:57 ` [Xen-devel] [PATCH v2 01/48] xen/sched: use new sched_unit instead of vcpu in scheduler interfaces Juergen Gross
2019-09-02 9:07 ` Jan Beulich
2019-09-09 5:26 ` Juergen Gross
2019-08-09 14:57 ` [Xen-devel] [PATCH v2 02/48] xen/sched: move per-vcpu scheduler private data pointer to sched_unit Juergen Gross
2019-08-23 10:47 ` Dario Faggioli
2019-08-09 14:57 ` [Xen-devel] [PATCH v2 03/48] xen/sched: build a linked list of struct sched_unit Juergen Gross
2019-08-23 10:52 ` Dario Faggioli
2019-08-09 14:57 ` Juergen Gross [this message]
2019-08-23 10:54 ` [Xen-devel] [PATCH v2 04/48] xen/sched: introduce struct sched_resource Dario Faggioli
2019-09-04 13:10 ` Jan Beulich
2019-09-09 5:31 ` Juergen Gross
2019-08-09 14:57 ` [Xen-devel] [PATCH v2 05/48] xen/sched: let pick_cpu return a scheduler resource Juergen Gross
2019-09-04 13:34 ` Jan Beulich
2019-09-09 5:43 ` Juergen Gross
2019-08-09 14:57 ` [Xen-devel] [PATCH v2 06/48] xen/sched: switch schedule_data.curr to point at sched_unit Juergen Gross
2019-09-04 13:36 ` Jan Beulich
2019-09-09 5:46 ` Juergen Gross
2019-08-09 14:57 ` [Xen-devel] [PATCH v2 07/48] xen/sched: move per cpu scheduler private data into struct sched_resource Juergen Gross
2019-09-04 13:48 ` Jan Beulich
2019-09-05 7:13 ` Juergen Gross
2019-09-05 7:38 ` Jan Beulich
2019-09-09 13:03 ` Dario Faggioli
2019-08-09 14:57 ` [Xen-devel] [PATCH v2 08/48] xen/sched: switch vcpu_schedule_lock to unit_schedule_lock Juergen Gross
2019-09-04 14:02 ` Jan Beulich
2019-09-04 14:41 ` Juergen Gross
2019-09-04 14:54 ` Jan Beulich
2019-09-04 15:02 ` Juergen Gross
2019-09-11 16:02 ` Dario Faggioli
2019-08-09 14:57 ` [Xen-devel] [PATCH v2 09/48] xen/sched: move some per-vcpu items to struct sched_unit Juergen Gross
2019-09-04 14:16 ` Jan Beulich
2019-09-09 6:39 ` Juergen Gross
2019-09-09 6:55 ` Jan Beulich
2019-09-09 7:05 ` Juergen Gross
2019-08-09 14:57 ` [Xen-devel] [PATCH v2 10/48] xen/sched: add scheduler helpers hiding vcpu Juergen Gross
2019-09-04 14:49 ` Jan Beulich
2019-09-11 13:22 ` Juergen Gross
2019-08-09 14:57 ` [Xen-devel] [PATCH v2 11/48] xen/sched: rename scheduler related perf counters Juergen Gross
2019-08-09 14:57 ` [Xen-devel] [PATCH v2 12/48] xen/sched: switch struct task_slice from vcpu to sched_unit Juergen Gross
2019-08-09 14:57 ` [Xen-devel] [PATCH v2 13/48] xen/sched: add is_running indicator to struct sched_unit Juergen Gross
2019-09-04 15:06 ` Jan Beulich
2019-09-11 13:44 ` Juergen Gross
2019-09-11 15:06 ` Jan Beulich
2019-09-11 15:32 ` Juergen Gross
2019-08-09 14:57 ` [Xen-devel] [PATCH v2 14/48] xen/sched: make null scheduler vcpu agnostic Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 15/48] xen/sched: make rt " Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 16/48] xen/sched: make credit " Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 17/48] xen/sched: make credit2 " Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 18/48] xen/sched: make arinc653 " Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 19/48] xen: add sched_unit_pause_nosync() and sched_unit_unpause() Juergen Gross
2019-09-09 13:34 ` Jan Beulich
2019-09-11 14:15 ` Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 20/48] xen: let vcpu_create() select processor Juergen Gross
2019-08-23 16:42 ` Julien Grall
2019-09-09 13:38 ` Jan Beulich
2019-09-11 14:22 ` Juergen Gross
2019-09-11 17:20 ` Dario Faggioli
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 21/48] xen/sched: use sched_resource cpu instead smp_processor_id in schedulers Juergen Gross
2019-09-09 14:17 ` Jan Beulich
2019-09-12 9:34 ` Juergen Gross
2019-09-12 10:04 ` Jan Beulich
2019-09-12 11:03 ` Juergen Gross
2019-09-12 11:17 ` Juergen Gross
2019-09-12 11:46 ` Jan Beulich
2019-09-12 11:53 ` Juergen Gross
2019-09-12 12:08 ` Jan Beulich
2019-09-12 12:13 ` Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 22/48] xen/sched: switch schedule() from vcpus to sched_units Juergen Gross
2019-09-09 14:35 ` Jan Beulich
2019-09-12 13:44 ` Juergen Gross
2019-09-12 14:34 ` Jan Beulich
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 23/48] xen/sched: switch sched_move_irqs() to take sched_unit as parameter Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 24/48] xen: switch from for_each_vcpu() to for_each_sched_unit() Juergen Gross
2019-09-09 15:14 ` Jan Beulich
2019-09-12 14:02 ` Juergen Gross
2019-09-12 14:40 ` Jan Beulich
2019-09-12 14:47 ` Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 25/48] xen/sched: add runstate counters to struct sched_unit Juergen Gross
2019-09-09 14:30 ` Jan Beulich
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 26/48] xen/sched: rework and rename vcpu_force_reschedule() Juergen Gross
2019-09-10 14:06 ` Jan Beulich
2019-09-13 9:33 ` Juergen Gross
2019-09-13 9:40 ` Jan Beulich
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 27/48] xen/sched: Change vcpu_migrate_*() to operate on schedule unit Juergen Gross
2019-09-10 15:11 ` Jan Beulich
2019-09-13 12:33 ` Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 28/48] xen/sched: move struct task_slice into struct sched_unit Juergen Gross
2019-09-10 15:18 ` Jan Beulich
2019-09-13 12:56 ` Juergen Gross
2019-09-12 8:13 ` Dario Faggioli
2019-09-12 8:21 ` Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 29/48] xen/sched: add code to sync scheduling of all vcpus of a sched unit Juergen Gross
2019-09-10 15:36 ` Jan Beulich
2019-09-13 13:12 ` Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 30/48] xen/sched: introduce unit_runnable_state() Juergen Gross
2019-09-11 10:30 ` Jan Beulich
2019-09-12 10:22 ` Dario Faggioli
2019-09-13 14:07 ` Juergen Gross
2019-09-13 14:44 ` Jan Beulich
2019-09-13 15:23 ` Juergen Gross
2019-09-12 10:24 ` Dario Faggioli
2019-09-13 14:14 ` Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 31/48] xen/sched: add support for multiple vcpus per sched unit where missing Juergen Gross
2019-09-11 10:43 ` Jan Beulich
2019-09-13 15:01 ` Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 32/48] xen/sched: modify cpupool_domain_cpumask() to be an unit mask Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 33/48] xen/sched: support allocating multiple vcpus into one sched unit Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 34/48] xen/sched: add a percpu resource index Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 35/48] xen/sched: add fall back to idle vcpu when scheduling unit Juergen Gross
2019-09-11 11:33 ` Julien Grall
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 36/48] xen/sched: make vcpu_wake() and vcpu_sleep() core scheduling aware Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 37/48] xen/sched: carve out freeing sched_unit memory into dedicated function Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 38/48] xen/sched: move per-cpu variable scheduler to struct sched_resource Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 39/48] xen/sched: move per-cpu variable cpupool " Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 40/48] xen/sched: reject switching smt on/off with core scheduling active Juergen Gross
2019-09-10 15:47 ` Jan Beulich
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 41/48] xen/sched: prepare per-cpupool scheduling granularity Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 42/48] xen/sched: split schedule_cpu_switch() Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 43/48] xen/sched: protect scheduling resource via rcu Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 44/48] xen/sched: support multiple cpus per scheduling resource Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 45/48] xen/sched: support differing granularity in schedule_cpu_[add/rm]() Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 46/48] xen/sched: support core scheduling for moving cpus to/from cpupools Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 47/48] xen/sched: disable scheduling when entering ACPI deep sleep states Juergen Gross
2019-08-09 14:58 ` [Xen-devel] [PATCH v2 48/48] xen/sched: add scheduling granularity enum Juergen Gross
2019-08-15 10:17 ` [Xen-devel] [PATCH v2 00/48] xen: add core scheduling support Sergey Dyasli
2019-09-05 6:22 ` Juergen Gross
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