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xen/tools: tracing: add record for credit1 runqueue stealing.
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> Acked-by: George Dunlap <george.dunlap@citrix.com>
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Dario Faggioli authored and George Dunlap committed
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@@ -47,6 +47,7 @@
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0x00022008 CPU%(cpu)d %(tsc)d (+%(reltsc)8d) csched:unboost [ dom:vcpu = 0x%(1)04x%(2)04x ]
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0x00022009 CPU%(cpu)d %(tsc)d (+%(reltsc)8d) csched:schedule [ cpu[16]:tasklet[8]:idle[8] = %(1)08x ]
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0x0002200A CPU%(cpu)d %(tsc)d (+%(reltsc)8d) csched:ratelimit [ dom:vcpu = 0x%(1)08x, runtime = %(2)d ]
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0x0002200B CPU%(cpu)d %(tsc)d (+%(reltsc)8d) csched:steal_check [ peer_cpu = %(1)d, checked = %(2)d ]
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0x00022201 CPU%(cpu)d %(tsc)d (+%(reltsc)8d) csched2:tick
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0x00022202 CPU%(cpu)d %(tsc)d (+%(reltsc)8d) csched2:runq_pos [ dom:vcpu = 0x%(1)08x, pos = %(2)d]
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@@ -7651,6 +7651,17 @@ void sched_process(struct pcpu_info *p)
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r->runtime / 1000, r->runtime % 1000);
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}
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break;
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case TRC_SCHED_CLASS_EVT(CSCHED, 11): /* STEAL_CHECK */
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if(opt.dump_all) {
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struct {
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unsigned int peer_cpu, check;
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} *r = (typeof(r))ri->d;
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printf(" %s csched:load_balance %s %u\n",
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ri->dump_header, r->check ? "checking" : "skipping",
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r->peer_cpu);
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}
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break;
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/* CREDIT 2 (TRC_CSCHED2_xxx) */
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case TRC_SCHED_CLASS_EVT(CSCHED2, 1): /* TICK */
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case TRC_SCHED_CLASS_EVT(CSCHED2, 4): /* CREDIT_ADD */
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@@ -134,6 +134,7 @@
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#define TRC_CSCHED_BOOST_END TRC_SCHED_CLASS_EVT(CSCHED, 8)
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#define TRC_CSCHED_SCHEDULE TRC_SCHED_CLASS_EVT(CSCHED, 9)
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#define TRC_CSCHED_RATELIMIT TRC_SCHED_CLASS_EVT(CSCHED, 10)
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#define TRC_CSCHED_STEAL_CHECK TRC_SCHED_CLASS_EVT(CSCHED, 11)
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/*
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@@ -1753,14 +1754,17 @@ csched_load_balance(struct csched_private *prv, int cpu,
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* balancing and trying to lock this CPU.
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*/
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spinlock_t *lock = pcpu_schedule_trylock(peer_cpu);
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SCHED_STAT_CRANK(steal_trylock);
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if ( !lock )
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{
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SCHED_STAT_CRANK(steal_trylock_failed);
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TRACE_2D(TRC_CSCHED_STEAL_CHECK, peer_cpu, /* skip */ 0);
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peer_cpu = cpumask_cycle(peer_cpu, &workers);
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continue;
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}
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TRACE_2D(TRC_CSCHED_STEAL_CHECK, peer_cpu, /* checked */ 1);
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/* Any work over there to steal? */
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speer = cpumask_test_cpu(peer_cpu, online) ?
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csched_runq_steal(peer_cpu, cpu, snext->pri, bstep) : NULL;
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@@ -48,6 +48,7 @@ PERFCOUNTER(vcpu_unpark, "csched: vcpu_unpark")
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PERFCOUNTER(load_balance_idle, "csched: load_balance_idle")
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PERFCOUNTER(load_balance_over, "csched: load_balance_over")
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PERFCOUNTER(load_balance_other, "csched: load_balance_other")
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PERFCOUNTER(steal_trylock, "csched: steal_trylock")
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PERFCOUNTER(steal_trylock_failed, "csched: steal_trylock_failed")
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PERFCOUNTER(steal_peer_idle, "csched: steal_peer_idle")
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PERFCOUNTER(migrate_queued, "csched: migrate_queued")
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