[Xen-devel] [PATCH 4/7] xen: print online pCPUs and free pCPUs when dumping scheduler info

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

e.g., with  `xl debug-key r'. This change adds something
like the following lines to the dump output:

  (XEN) Num online Cpus: 16, cpu_online_map: 0-15
  (XEN) Num free Cpus: 8, cpupool_free_cpus: 8-15

Meaning there are 16 pCPUs online, and they are pCPUs
0-15, and that 8 of them, more specifically 8-15, are
not part of any cpupool.

Signed-off-by: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
Cc: Juergen Gross <JGross@xxxxxxxx>
Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
Cc: Jan Beulich <JBeulich@xxxxxxxx>
Cc: Keir Fraser <keir@xxxxxxx>
---
 xen/common/cpupool.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/xen/common/cpupool.c b/xen/common/cpupool.c
index cd6aab9..3bf0174 100644
--- a/xen/common/cpupool.c
+++ b/xen/common/cpupool.c
@@ -17,6 +17,7 @@
 #include <xen/percpu.h>
 #include <xen/sched.h>
 #include <xen/sched-if.h>
+#include <xen/keyhandler.h>
 #include <xen/cpu.h>
 
 #define for_each_cpupool(ptr)    \
@@ -658,6 +659,12 @@ int cpupool_do_sysctl(struct xen_sysctl_cpupool_op *op)
     return ret;
 }
 
+static void _print_cpumap(const char *str, const cpumask_t *map)
+{
+    cpulist_scnprintf(keyhandler_scratch, sizeof(keyhandler_scratch), map);
+    printk("%s: %s\n", str, keyhandler_scratch);
+}
+
 void dump_runq(unsigned char key)
 {
     unsigned long    flags;
@@ -671,12 +678,18 @@ void dump_runq(unsigned char key)
             sched_smt_power_savings? "enabled":"disabled");
     printk("NOW=0x%08X%08X\n",  (u32)(now>>32), (u32)now);
 
+    printk("Num online Cpus: %d, ", cpumask_weight(&cpu_online_map));
+    _print_cpumap("cpu_online_map", &cpu_online_map);
+    printk("Num free Cpus: %d, ", cpumask_weight(&cpupool_free_cpus));
+    _print_cpumap("cpupool_free_cpus", &cpupool_free_cpus);
+
     printk("Idle cpupool:\n");
     schedule_dump(NULL);
 
     for_each_cpupool(c)
     {
         printk("Cpupool %d:\n", (*c)->cpupool_id);
+        _print_cpumap("Cpus", (*c)->cpu_valid);
         schedule_dump(*c);
     }
 


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