[Xen-devel] [PATCH v2] xen: credit2: performance counter for load balancing call

[Praveen Kumar <kpraveen.lkml@xxxxxxxxx>]

The patch introduces a new performance counter that counts how many times we go
through the load balancing logic called in Credit2.

Signed-off-by: Praveen Kumar <kpraveen.lkml@xxxxxxxxx>
Acked-by: Dario Faggioli <dario.faggioli@xxxxxxxxxx>

---
diff --git a/xen/common/sched_credit2.c b/xen/common/sched_credit2.c
index ef8e0d8..f212338 100644
--- a/xen/common/sched_credit2.c
+++ b/xen/common/sched_credit2.c
@@ -1869,6 +1869,8 @@ retry:
                     (unsigned char *)&d);
     }
 
+    SCHED_STAT_CRANK(acct_load_balance);
+
     /* Look for "swap" which gives the best load average
      * FIXME: O(n^2)! */
 
diff --git a/xen/include/xen/perfc_defn.h b/xen/include/xen/perfc_defn.h
index 900fddd..0d702f0 100644
--- a/xen/include/xen/perfc_defn.h
+++ b/xen/include/xen/perfc_defn.h
@@ -57,6 +57,7 @@ PERFCOUNTER(vcpu_hot,               "csched: vcpu_hot")
 
 /* credit2 specific counters */
 PERFCOUNTER(burn_credits_t2c,       "csched2: burn_credits_t2c")
+PERFCOUNTER(acct_load_balance,      "csched2: acct_load_balance")
 PERFCOUNTER(upd_max_weight_quick,   "csched2: update_max_weight_quick")
 PERFCOUNTER(upd_max_weight_full,    "csched2: update_max_weight_full")
 PERFCOUNTER(migrate_requested,      "csched2: migrate_requested")

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