credit1: trace vCPU boost/unboost

Add tracepoints and a performance counter for
boosting and unboosting in Credit1.

Note that they (the trace points) do not cover
the case of the idle vCPU being boosted to run
a tasklet, as there already is
TRC_CSCHED_SCHED_TASKLET for that.

Signed-off-by:  Dario Faggioli <dario.faggioli@citrix.com>
Reviewed-by: George Dunlap <george.dunlap@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

diff --git a/xen/common/sched_credit.c b/xen/common/sched_credit.c
index c336bace7bc329aef0ef6795eb78e28a53820915..0af5f696308cc9da44851c727032b278b331b16a 100644 (file)
--- a/xen/common/sched_credit.c
+++ b/xen/common/sched_credit.c
@@ -126,6 +126,8 @@
 #define TRC_CSCHED_STOLEN_VCPU   TRC_SCHED_CLASS_EVT(CSCHED, 4)
 #define TRC_CSCHED_PICKED_CPU    TRC_SCHED_CLASS_EVT(CSCHED, 5)
 #define TRC_CSCHED_TICKLE        TRC_SCHED_CLASS_EVT(CSCHED, 6)
+#define TRC_CSCHED_BOOST_START   TRC_SCHED_CLASS_EVT(CSCHED, 7)
+#define TRC_CSCHED_BOOST_END     TRC_SCHED_CLASS_EVT(CSCHED, 8)
 
 
 /*
@@ -855,7 +857,11 @@ csched_vcpu_acct(struct csched_private *prv, unsigned int cpu)
      * amount of CPU resources and should no longer be boosted.
      */
     if ( svc->pri == CSCHED_PRI_TS_BOOST )
+    {
         svc->pri = CSCHED_PRI_TS_UNDER;
+        TRACE_2D(TRC_CSCHED_BOOST_END, svc->sdom->dom->domain_id,
+                 svc->vcpu->vcpu_id);
+    }
 
     /*
      * Update credits
@@ -1021,6 +1027,8 @@ csched_vcpu_wake(const struct scheduler *ops, struct vcpu *vc)
     if ( svc->pri == CSCHED_PRI_TS_UNDER &&
          !test_bit(CSCHED_FLAG_VCPU_PARKED, &svc->flags) )
     {
+        TRACE_2D(TRC_CSCHED_BOOST_START, vc->domain->domain_id, vc->vcpu_id);
+        SCHED_STAT_CRANK(vcpu_boost);
         svc->pri = CSCHED_PRI_TS_BOOST;
     }
 

diff --git a/xen/include/xen/perfc_defn.h b/xen/include/xen/perfc_defn.h
index 76ee8031a15fd9813846a23ad6c4fed76bde7e3f..21c1e0b54dd6f569dd6b3d617a0cf1f7293af254 100644 (file)
--- a/xen/include/xen/perfc_defn.h
+++ b/xen/include/xen/perfc_defn.h
@@ -40,6 +40,7 @@ PERFCOUNTER(acct_reorder,           "csched: acct_reorder")
 PERFCOUNTER(acct_min_credit,        "csched: acct_min_credit")
 PERFCOUNTER(acct_vcpu_active,       "csched: acct_vcpu_active")
 PERFCOUNTER(acct_vcpu_idle,         "csched: acct_vcpu_idle")
+PERFCOUNTER(vcpu_boost,             "csched: vcpu_boost")
 PERFCOUNTER(vcpu_park,              "csched: vcpu_park")
 PERFCOUNTER(vcpu_unpark,            "csched: vcpu_unpark")
 PERFCOUNTER(load_balance_idle,      "csched: load_balance_idle")