[Xen-changelog] [xen staging] sched: add some diagnostic info in the run queue keyhandler

[patchbot@xxxxxxx]

commit 1bfa59ba3b0647007e34b3cb8f8daad045467fb7
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Thu Feb 20 11:36:16 2020 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Feb 20 11:36:16 2020 +0100

    sched: add some diagnostic info in the run queue keyhandler
    
    When dumping the run queue information add some more data regarding
    current and (if known) previous vcpu for each physical cpu.
    
    With core scheduling activated the printed data will be e.g.:
    
    (XEN) CPUs info:
    (XEN) CPU[00] current=d[IDLE]v0, curr=d[IDLE]v0, prev=NULL
    (XEN) CPU[01] current=d[IDLE]v1
    (XEN) CPU[02] current=d[IDLE]v2, curr=d[IDLE]v2, prev=NULL
    (XEN) CPU[03] current=d[IDLE]v3
    
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Reviewed-by: Dario Faggioli <dfaggioli@xxxxxxxx>
---
 xen/common/sched/core.c | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/xen/common/sched/core.c b/xen/common/sched/core.c
index de5a6b1a57..7e8e7d2c39 100644
--- a/xen/common/sched/core.c
+++ b/xen/common/sched/core.c
@@ -3243,7 +3243,7 @@ void scheduler_free(struct scheduler *sched)
 
 void schedule_dump(struct cpupool *c)
 {
-    unsigned int      i;
+    unsigned int      i, j;
     struct scheduler *sched;
     cpumask_t        *cpus;
 
@@ -3254,7 +3254,7 @@ void schedule_dump(struct cpupool *c)
     if ( c != NULL )
     {
         sched = c->sched;
-        cpus = c->cpu_valid;
+        cpus = c->res_valid;
         printk("Scheduler: %s (%s)\n", sched->name, sched->opt_name);
         sched_dump_settings(sched);
     }
@@ -3264,11 +3264,25 @@ void schedule_dump(struct cpupool *c)
         cpus = &cpupool_free_cpus;
     }
 
-    if ( sched->dump_cpu_state != NULL )
+    printk("CPUs info:\n");
+    for_each_cpu (i, cpus)
     {
-        printk("CPUs info:\n");
-        for_each_cpu (i, cpus)
-            sched_dump_cpu_state(sched, i);
+        struct sched_resource *sr = get_sched_res(i);
+        unsigned long flags;
+        spinlock_t *lock;
+
+        lock = pcpu_schedule_lock_irqsave(i, &flags);
+
+        printk("CPU[%02d] current=%pv, curr=%pv, prev=%pv\n", i,
+               get_cpu_current(i), sr->curr ? sr->curr->vcpu_list : NULL,
+               sr->prev ? sr->prev->vcpu_list : NULL);
+        for_each_cpu (j, sr->cpus)
+            if ( i != j )
+                printk("CPU[%02d] current=%pv\n", j, get_cpu_current(j));
+
+        pcpu_schedule_unlock_irqrestore(lock, flags, i);
+
+        sched_dump_cpu_state(sched, i);
     }
 
     rcu_read_unlock(&sched_res_rculock);
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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