From: Rik van Riel <riel@xxxxxxxxxx>
Being able to see how the active nodemask changes over time, and why,
can be quite useful.
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Chegu Vinod <chegu_vinod@xxxxxx>
Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>
---
include/trace/events/sched.h | 34 ++++++++++++++++++++++++++++++++++
kernel/sched/fair.c | 8 ++++++--
2 files changed, 40 insertions(+), 2 deletions(-)
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index 67e1bbf..91726b6 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -530,6 +530,40 @@ TRACE_EVENT(sched_swap_numa,
__entry->dst_pid, __entry->dst_tgid, __entry->dst_ngid,
__entry->dst_cpu, __entry->dst_nid)
);
+
+TRACE_EVENT(update_numa_active_nodes_mask,
+
+ TP_PROTO(int pid, int gid, int nid, int set, long faults, long max_faults),
+
+ TP_ARGS(pid, gid, nid, set, faults, max_faults),
+
+ TP_STRUCT__entry(
+ __field( pid_t, pid)
+ __field( pid_t, gid)
+ __field( int, nid)
+ __field( int, set)
+ __field( long, faults)
+ __field( long, max_faults);
+ ),
+
+ TP_fast_assign(
+ __entry->pid = pid;
+ __entry->gid = gid;
+ __entry->nid = nid;
+ __entry->set = set;
+ __entry->faults = faults;
+ __entry->max_faults = max_faults;
+ ),
+
+ TP_printk("pid=%d gid=%d nid=%d set=%d faults=%ld max_faults=%ld",
+ __entry->pid,
+ __entry->gid,
+ __entry->nid,
+ __entry->set,
+ __entry->faults,
+ __entry->max_faults)
+
+);
#endif /* _TRACE_SCHED_H */
/* This part must be outside protection */
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index aa680e2..3551009 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1300,10 +1300,14 @@ static void update_numa_active_node_mask(struct task_struct *p)
faults = numa_group->faults_from[task_faults_idx(nid, 0)] +
numa_group->faults_from[task_faults_idx(nid, 1)];
if (!node_isset(nid, numa_group->active_nodes)) {
- if (faults > max_faults * 4 / 10)
+ if (faults > max_faults * 4 / 10) {
+ trace_update_numa_active_nodes_mask(current->pid, numa_group->gid, nid, true, faults, max_faults);
node_set(nid, numa_group->active_nodes);
- } else if (faults < max_faults * 2 / 10)
+ }
+ } else if (faults < max_faults * 2 / 10) {
+ trace_update_numa_active_nodes_mask(current->pid, numa_group->gid, nid, false, faults, max_faults);
node_clear(nid, numa_group->active_nodes);
+ }
}
}
--
1.8.4.2
--
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