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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>,
	Jan Beulich <jbeulich@suse.com>
Subject: [Xen-devel] [PATCH v2 42/48] xen/sched: split schedule_cpu_switch()
Date: Fri,  9 Aug 2019 16:58:27 +0200
Message-ID: <20190809145833.1020-43-jgross@suse.com> (raw)
In-Reply-To: <20190809145833.1020-1-jgross@suse.com>

Instead of letting schedule_cpu_switch() handle moving cpus from and
to cpupools, split it into schedule_cpu_add() and schedule_cpu_rm().

This will allow us to drop allocating/freeing scheduler data for free
cpus as the idle scheduler doesn't need such data.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
V1: new patch
---
 xen/common/cpupool.c    |   4 +-
 xen/common/schedule.c   | 125 +++++++++++++++++++++++++++---------------------
 xen/include/xen/sched.h |   3 +-
 3 files changed, 74 insertions(+), 58 deletions(-)

diff --git a/xen/common/cpupool.c b/xen/common/cpupool.c
index 8789fde3c4..4749ead846 100644
--- a/xen/common/cpupool.c
+++ b/xen/common/cpupool.c
@@ -268,7 +268,7 @@ static int cpupool_assign_cpu_locked(struct cpupool *c, unsigned int cpu)
 
     if ( (cpupool_moving_cpu == cpu) && (c != cpupool_cpu_moving) )
         return -EADDRNOTAVAIL;
-    ret = schedule_cpu_switch(cpu, c);
+    ret = schedule_cpu_add(cpu, c);
     if ( ret )
         return ret;
 
@@ -318,7 +318,7 @@ static int cpupool_unassign_cpu_epilogue(struct cpupool *c)
      */
     if ( !ret )
     {
-        ret = schedule_cpu_switch(cpu, NULL);
+        ret = schedule_cpu_rm(cpu);
         if ( ret )
             cpumask_clear_cpu(cpu, &cpupool_free_cpus);
         else
diff --git a/xen/common/schedule.c b/xen/common/schedule.c
index 7823b48e32..999f6e347b 100644
--- a/xen/common/schedule.c
+++ b/xen/common/schedule.c
@@ -83,15 +83,6 @@ extern const struct scheduler *__start_schedulers_array[], *__end_schedulers_arr
 
 static struct scheduler __read_mostly ops;
 
-static spinlock_t *
-sched_idle_switch_sched(struct scheduler *new_ops, unsigned int cpu,
-                        void *pdata, void *vdata)
-{
-    sched_idle_unit(cpu)->priv = NULL;
-
-    return &sched_free_cpu_lock;
-}
-
 static struct sched_resource *
 sched_idle_res_pick(const struct scheduler *ops, struct sched_unit *unit)
 {
@@ -131,7 +122,6 @@ static struct scheduler sched_idle_ops = {
 
     .alloc_vdata    = sched_idle_alloc_vdata,
     .free_vdata     = sched_idle_free_vdata,
-    .switch_sched   = sched_idle_switch_sched,
 };
 
 static inline struct vcpu *unit2vcpu_cpu(struct sched_unit *unit,
@@ -2492,36 +2482,22 @@ void __init scheduler_init(void)
 }
 
 /*
- * Move a pCPU outside of the influence of the scheduler of its current
- * cpupool, or subject it to the scheduler of a new cpupool.
- *
- * For the pCPUs that are removed from their cpupool, their scheduler becomes
- * &sched_idle_ops (the idle scheduler).
+ * Move a pCPU from free cpus (running the idle scheduler) to a cpupool
+ * using any "real" scheduler.
+ * The cpu is still marked as "free" and not yet valid for its cpupool.
  */
-int schedule_cpu_switch(unsigned int cpu, struct cpupool *c)
+int schedule_cpu_add(unsigned int cpu, struct cpupool *c)
 {
     struct vcpu *idle;
-    void *ppriv, *ppriv_old, *vpriv, *vpriv_old;
-    struct scheduler *old_ops = get_sched_res(cpu)->scheduler;
-    struct scheduler *new_ops = (c == NULL) ? &sched_idle_ops : c->sched;
+    void *ppriv, *vpriv;
+    struct scheduler *new_ops = c->sched;
     struct sched_resource *sd = get_sched_res(cpu);
-    struct cpupool *old_pool = sd->cpupool;
     spinlock_t *old_lock, *new_lock;
     unsigned long flags;
 
-    /*
-     * pCPUs only move from a valid cpupool to free (i.e., out of any pool),
-     * or from free to a valid cpupool. In the former case (which happens when
-     * c is NULL), we want the CPU to have been marked as free already, as
-     * well as to not be valid for the source pool any longer, when we get to
-     * here. In the latter case (which happens when c is a valid cpupool), we
-     * want the CPU to still be marked as free, as well as to not yet be valid
-     * for the destination pool.
-     */
-    ASSERT(c != old_pool && (c != NULL || old_pool != NULL));
     ASSERT(cpumask_test_cpu(cpu, &cpupool_free_cpus));
-    ASSERT((c == NULL && !cpumask_test_cpu(cpu, old_pool->cpu_valid)) ||
-           (c != NULL && !cpumask_test_cpu(cpu, c->cpu_valid)));
+    ASSERT(!cpumask_test_cpu(cpu, c->cpu_valid));
+    ASSERT(get_sched_res(cpu)->cpupool == NULL);
 
     /*
      * To setup the cpu for the new scheduler we need:
@@ -2546,52 +2522,91 @@ int schedule_cpu_switch(unsigned int cpu, struct cpupool *c)
         return -ENOMEM;
     }
 
-    sched_do_tick_suspend(old_ops, cpu);
-
     /*
-     * The actual switch, including (if necessary) the rerouting of the
-     * scheduler lock to whatever new_ops prefers,  needs to happen in one
-     * critical section, protected by old_ops' lock, or races are possible.
-     * It is, in fact, the lock of another scheduler that we are taking (the
-     * scheduler of the cpupool that cpu still belongs to). But that is ok
-     * as, anyone trying to schedule on this cpu will spin until when we
-     * release that lock (bottom of this function). When he'll get the lock
-     * --thanks to the loop inside *_schedule_lock() functions-- he'll notice
-     * that the lock itself changed, and retry acquiring the new one (which
-     * will be the correct, remapped one, at that point).
+     * The actual switch, including the rerouting of the scheduler lock to
+     * whatever new_ops prefers, needs to happen in one critical section,
+     * protected by old_ops' lock, or races are possible.
+     * It is, in fact, the lock of the idle scheduler that we are taking.
+     * But that is ok as anyone trying to schedule on this cpu will spin until
+     * when we release that lock (bottom of this function). When he'll get the
+     * lock --thanks to the loop inside *_schedule_lock() functions-- he'll
+     * notice that the lock itself changed, and retry acquiring the new one
+     * (which will be the correct, remapped one, at that point).
      */
     old_lock = pcpu_schedule_lock_irqsave(cpu, &flags);
 
-    vpriv_old = idle->sched_unit->priv;
-    ppriv_old = sd->sched_priv;
     new_lock = sched_switch_sched(new_ops, cpu, ppriv, vpriv);
 
     sd->scheduler = new_ops;
     sd->sched_priv = ppriv;
 
     /*
-     * The data above is protected under new_lock, which may be unlocked.
-     * Another CPU can take new_lock as soon as sd->schedule_lock is visible,
-     * and must observe all prior initialisation.
+     * Reroute the lock to the per pCPU lock as /last/ thing. In fact,
+     * if it is free (and it can be) we want that anyone that manages
+     * taking it, finds all the initializations we've done above in place.
      */
     smp_wmb();
     sd->schedule_lock = new_lock;
 
-    /* _Not_ pcpu_schedule_unlock(): schedule_lock may have changed! */
+    /* _Not_ pcpu_schedule_unlock(): schedule_lock has changed! */
     spin_unlock_irqrestore(old_lock, flags);
 
     sched_do_tick_resume(new_ops, cpu);
 
+    sd->granularity = c->granularity;
+    sd->cpupool = c;
+    /* The  cpu is added to a pool, trigger it to go pick up some work */
+    cpu_raise_softirq(cpu, SCHEDULE_SOFTIRQ);
+
+    return 0;
+}
+
+/*
+ * Remove a pCPU from its cpupool. Its scheduler becomes &sched_idle_ops
+ * (the idle scheduler).
+ * The cpu is already marked as "free" and not valid any longer for its
+ * cpupool.
+ */
+int schedule_cpu_rm(unsigned int cpu)
+{
+    struct vcpu *idle;
+    void *ppriv_old, *vpriv_old;
+    struct sched_resource *sd = get_sched_res(cpu);
+    struct scheduler *old_ops = sd->scheduler;
+    spinlock_t *old_lock;
+    unsigned long flags;
+
+    ASSERT(sd->cpupool != NULL);
+    ASSERT(cpumask_test_cpu(cpu, &cpupool_free_cpus));
+    ASSERT(!cpumask_test_cpu(cpu, sd->cpupool->cpu_valid));
+
+    idle = idle_vcpu[cpu];
+
+    sched_do_tick_suspend(old_ops, cpu);
+
+    /* See comment in schedule_cpu_add() regarding lock switching. */
+    old_lock = pcpu_schedule_lock_irqsave(cpu, &flags);
+
+    vpriv_old = idle->sched_unit->priv;
+    ppriv_old = sd->sched_priv;
+
+    idle->sched_unit->priv = NULL;
+    sd->scheduler = &sched_idle_ops;
+    sd->sched_priv = NULL;
+
+    smp_mb();
+    sd->schedule_lock = &sched_free_cpu_lock;
+
+    /* _Not_ pcpu_schedule_unlock(): schedule_lock may have changed! */
+    spin_unlock_irqrestore(old_lock, flags);
+
     sched_deinit_pdata(old_ops, ppriv_old, cpu);
 
     sched_free_vdata(old_ops, vpriv_old);
     sched_free_pdata(old_ops, ppriv_old, cpu);
 
-    get_sched_res(cpu)->granularity = c ? c->granularity : 1;
-    get_sched_res(cpu)->cpupool = c;
-    /* When a cpu is added to a pool, trigger it to go pick up some work */
-    if ( c != NULL )
-        cpu_raise_softirq(cpu, SCHEDULE_SOFTIRQ);
+    sd->granularity = 1;
+    sd->cpupool = NULL;
 
     return 0;
 }
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index 39355f5d67..346e564e05 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -910,7 +910,8 @@ struct scheduler;
 struct scheduler *scheduler_get_default(void);
 struct scheduler *scheduler_alloc(unsigned int sched_id, int *perr);
 void scheduler_free(struct scheduler *sched);
-int schedule_cpu_switch(unsigned int cpu, struct cpupool *c);
+int schedule_cpu_add(unsigned int cpu, struct cpupool *c);
+int schedule_cpu_rm(unsigned int cpu);
 void vcpu_set_periodic_timer(struct vcpu *v, s_time_t value);
 int cpu_disable_scheduler(unsigned int cpu);
 /* We need it in dom0_setup_vcpu */
-- 
2.16.4


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  parent reply index

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 ` [Xen-devel] [PATCH v2 04/48] xen/sched: introduce struct sched_resource Juergen Gross
2019-08-23 10:54   ` 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 ` Juergen Gross [this message]
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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