@@ -47,6 +47,7 @@
0x00022008 CPU%(cpu)d %(tsc)d (+%(reltsc)8d) csched:unboost [ dom:vcpu = 0x%(1)04x%(2)04x ]
0x00022009 CPU%(cpu)d %(tsc)d (+%(reltsc)8d) csched:schedule [ cpu[16]:tasklet[8]:idle[8] = %(1)08x ]
0x0002200A CPU%(cpu)d %(tsc)d (+%(reltsc)8d) csched:ratelimit [ dom:vcpu = 0x%(1)08x, runtime = %(2)d ]
+0x0002200B CPU%(cpu)d %(tsc)d (+%(reltsc)8d) csched:steal_check [ peer_cpu = %(1)d, checked = %(2)d ]
0x00022201 CPU%(cpu)d %(tsc)d (+%(reltsc)8d) csched2:tick
0x00022202 CPU%(cpu)d %(tsc)d (+%(reltsc)8d) csched2:runq_pos [ dom:vcpu = 0x%(1)08x, pos = %(2)d]
@@ -7651,6 +7651,17 @@ void sched_process(struct pcpu_info *p)
r->runtime / 1000, r->runtime % 1000);
}
break;
+ case TRC_SCHED_CLASS_EVT(CSCHED, 11): /* STEAL_CHECK */
+ if(opt.dump_all) {
+ struct {
+ unsigned int peer_cpu, check;
+ } *r = (typeof(r))ri->d;
+
+ printf(" %s csched:load_balance %s %u\n",
+ ri->dump_header, r->check ? "checking" : "skipping",
+ r->peer_cpu);
+ }
+ break;
/* CREDIT 2 (TRC_CSCHED2_xxx) */
case TRC_SCHED_CLASS_EVT(CSCHED2, 1): /* TICK */
case TRC_SCHED_CLASS_EVT(CSCHED2, 4): /* CREDIT_ADD */
@@ -134,6 +134,7 @@
#define TRC_CSCHED_BOOST_END TRC_SCHED_CLASS_EVT(CSCHED, 8)
#define TRC_CSCHED_SCHEDULE TRC_SCHED_CLASS_EVT(CSCHED, 9)
#define TRC_CSCHED_RATELIMIT TRC_SCHED_CLASS_EVT(CSCHED, 10)
+#define TRC_CSCHED_STEAL_CHECK TRC_SCHED_CLASS_EVT(CSCHED, 11)
/*
@@ -1767,12 +1768,17 @@ csched_load_balance(struct csched_private *prv, int cpu,
*/
spinlock_t *lock = pcpu_schedule_trylock(peer_cpu);
+ SCHED_STAT_CRANK(steal_check);
+
if ( !lock )
{
SCHED_STAT_CRANK(steal_trylock_failed);
+ TRACE_2D(TRC_CSCHED_STEAL_CHECK, peer_cpu, /* skipped */ 0);
peer_cpu = cpumask_cycle(peer_cpu, &workers);
continue;
}
+ else
+ TRACE_2D(TRC_CSCHED_STEAL_CHECK, peer_cpu, /* checked */ 1);
/* Any work over there to steal? */
speer = cpumask_test_cpu(peer_cpu, online) ?
@@ -48,6 +48,7 @@ PERFCOUNTER(vcpu_unpark, "csched: vcpu_unpark")
PERFCOUNTER(load_balance_idle, "csched: load_balance_idle")
PERFCOUNTER(load_balance_over, "csched: load_balance_over")
PERFCOUNTER(load_balance_other, "csched: load_balance_other")
+PERFCOUNTER(steal_check, "csched: steal_check")
PERFCOUNTER(steal_trylock_failed, "csched: steal_trylock_failed")
PERFCOUNTER(steal_peer_idle, "csched: steal_peer_idle")
PERFCOUNTER(migrate_queued, "csched: migrate_queued")
Including whether we actually tried stealing a vCPU from a given pCPU, or we skipped that one, because of lock contention. Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com> --- Cc: George Dunlap <george.dunlap@citrix.com> Cc: Ian Jackson <ian.jackson@eu.citrix.com> Cc: Wei Liu <wei.liu2@citrix.com> --- tools/xentrace/formats | 1 + tools/xentrace/xenalyze.c | 11 +++++++++++ xen/common/sched_credit.c | 6 ++++++ xen/include/xen/perfc_defn.h | 1 + 4 files changed, 19 insertions(+)