[Xen-changelog] [xen staging] xen/sched: add a percpu resource index

[patchbot@xxxxxxx]

commit 6a4d4066756ca655026b73dfa7b5e8f9a001b9a3
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Wed Oct 2 09:27:31 2019 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Oct 4 12:56:55 2019 +0200

    xen/sched: add a percpu resource index
    
    Add a percpu variable holding the index of the cpu in the current
    sched_resource structure. This index is used to get the correct vcpu
    of a sched_unit on a specific cpu.
    
    For now this index will be zero for all cpus, but with core scheduling
    it will be possible to have higher values, too.
    
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Reviewed-by: Dario Faggioli <dfaggioli@xxxxxxxx>
---
 xen/common/schedule.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/xen/common/schedule.c b/xen/common/schedule.c
index 37002b4c0e..c8e2999407 100644
--- a/xen/common/schedule.c
+++ b/xen/common/schedule.c
@@ -77,6 +77,7 @@ static void poll_timer_fn(void *data);
 /* This is global for now so that private implementations can reach it */
 DEFINE_PER_CPU(struct scheduler *, scheduler);
 DEFINE_PER_CPU_READ_MOSTLY(struct sched_resource *, sched_res);
+static DEFINE_PER_CPU_READ_MOSTLY(unsigned int, sched_res_idx);
 
 /* Scratch space for cpumasks. */
 DEFINE_PER_CPU(cpumask_t, cpumask_scratch);
@@ -144,6 +145,12 @@ static struct scheduler sched_idle_ops = {
     .switch_sched   = sched_idle_switch_sched,
 };
 
+static inline struct vcpu *sched_unit2vcpu_cpu(const struct sched_unit *unit,
+                                               unsigned int cpu)
+{
+    return unit->domain->vcpu[unit->unit_id + per_cpu(sched_res_idx, cpu)];
+}
+
 static inline struct scheduler *dom_scheduler(const struct domain *d)
 {
     if ( likely(d->cpupool != NULL) )
@@ -2030,7 +2037,7 @@ static void sched_slave(void)
 
     pcpu_schedule_unlock_irq(lock, cpu);
 
-    sched_context_switch(vprev, next->vcpu_list, now);
+    sched_context_switch(vprev, sched_unit2vcpu_cpu(next, cpu), now);
 }
 
 /*
@@ -2091,7 +2098,7 @@ static void schedule(void)
 
     pcpu_schedule_unlock_irq(lock, cpu);
 
-    vnext = next->vcpu_list;
+    vnext = sched_unit2vcpu_cpu(next, cpu);
     sched_context_switch(vprev, vnext, now);
 }
 
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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