[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH RFC 35/49] xen/sched: add runstate counters to struct sched_item
Add counters to struct sched_item indicating how many vcpus are either running/runnable or blocked/paused. The counters are updated when a vcpu runstate is changed. Signed-off-by: Juergen Gross <jgross@xxxxxxxx> --- xen/common/schedule.c | 27 +++++++++++++++++++++++++++ xen/include/xen/sched-if.h | 4 ++++ 2 files changed, 31 insertions(+) diff --git a/xen/common/schedule.c b/xen/common/schedule.c index 5a12d9bdc7..0a94505b89 100644 --- a/xen/common/schedule.c +++ b/xen/common/schedule.c @@ -178,6 +178,7 @@ static inline void vcpu_runstate_change( struct vcpu *v, int new_state, s_time_t new_entry_time) { s_time_t delta; + bool old_run, new_run; ASSERT(v->runstate.state != new_state); ASSERT(spin_is_locked(per_cpu(sched_res, v->processor)->schedule_lock)); @@ -186,6 +187,26 @@ static inline void vcpu_runstate_change( trace_runstate_change(v, new_state); + old_run = (v->runstate.state == RUNSTATE_running || + v->runstate.state == RUNSTATE_runnable); + new_run = (new_state == RUNSTATE_running || new_state == RUNSTATE_runnable); + + if ( old_run != new_run ) + { + struct sched_item *item = v->sched_item; + + if ( old_run ) + { + item->run_cnt--; + item->idle_cnt++; + } + else + { + item->run_cnt++; + item->idle_cnt--; + } + } + delta = new_entry_time - v->runstate.state_entry_time; if ( delta > 0 ) { @@ -362,9 +383,15 @@ int sched_init_vcpu(struct vcpu *v) return 1; if ( is_idle_domain(d) ) + { processor = v->vcpu_id; + item->run_cnt++; + } else + { processor = sched_select_initial_cpu(v); + item->idle_cnt++; + } sched_set_res(item, per_cpu(sched_res, processor)); diff --git a/xen/include/xen/sched-if.h b/xen/include/xen/sched-if.h index 38b403dfbf..795b2fafe5 100644 --- a/xen/include/xen/sched-if.h +++ b/xen/include/xen/sched-if.h @@ -62,6 +62,10 @@ struct sched_item { /* Last time item got (de-)scheduled. */ uint64_t state_entry_time; + /* Vcpu state summary. */ + unsigned int run_cnt; /* vcpus running or runnable */ + unsigned int idle_cnt; /* vcpus blocked or offline */ + /* Currently running on a CPU? */ bool is_running; /* Item needs affinity restored */ -- 2.16.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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