[52/60] xen/sched: populate cpupool0 only after all cpus are up
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Message ID 20190528103313.1343-53-jgross@suse.com
State New, archived
Headers show
Series
  • xen: add core scheduling support
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Commit Message

Jürgen Groß May 28, 2019, 10:33 a.m. UTC
With core or socket scheduling we need to know the number of siblings
per scheduling unit before we can setup the scheduler properly. In
order to prepare that do cpupool0 population only after all cpus are
up.

With that in place there is no need to create cpupool0 earlier, so
do that just before assigning the cpus. Initialize free cpus with all
online cpus at that time in order to be able to add the cpu notifier
late, too.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
V1: new patch
---
 xen/common/cpupool.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

Patch
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diff --git a/xen/common/cpupool.c b/xen/common/cpupool.c
index 403036c092..2a3e144700 100644
--- a/xen/common/cpupool.c
+++ b/xen/common/cpupool.c
@@ -775,18 +775,28 @@  static struct notifier_block cpu_nfb = {
     .notifier_call = cpu_callback
 };
 
-static int __init cpupool_presmp_init(void)
+static int __init cpupool_init(void)
 {
+    unsigned int cpu;
     int err;
-    void *cpu = (void *)(long)smp_processor_id();
+
     cpupool0 = cpupool_create(0, 0, &err);
     BUG_ON(cpupool0 == NULL);
     cpupool_put(cpupool0);
-    cpu_callback(&cpu_nfb, CPU_ONLINE, cpu);
     register_cpu_notifier(&cpu_nfb);
+
+    spin_lock(&cpupool_lock);
+
+    cpumask_copy(&cpupool_free_cpus, &cpu_online_map);
+
+    for_each_cpu ( cpu, &cpupool_free_cpus )
+        cpupool_assign_cpu_locked(cpupool0, cpu);
+
+    spin_unlock(&cpupool_lock);
+
     return 0;
 }
-presmp_initcall(cpupool_presmp_init);
+__initcall(cpupool_init);
 
 /*
  * Local variables: