NUMA balancing will try to migrate pages between nodes, which could caused by memory policy or numa group aggregation, while the page migration could failed too for eg when the target node run out of memory. Since this is critical to the performance, admin should know how serious the problem is, and take actions before it causing too much performance damage, thus this patch expose the counter as 'migfailed' in '/proc/PID/sched'. Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Michal Koutný <mkoutny@xxxxxxxx> Suggested-by: Mel Gorman <mgorman@xxxxxxx> Signed-off-by: Michael Wang <yun.wang@xxxxxxxxxxxxxxxxx> --- kernel/sched/debug.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index f7e4579e746c..73c4809c8f37 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -848,6 +848,7 @@ static void sched_show_numa(struct task_struct *p, struct seq_file *m) P(total_numa_faults); SEQ_printf(m, "current_node=%d, numa_group_id=%d\n", task_node(p), task_numa_group_id(p)); + SEQ_printf(m, "migfailed=%lu\n", p->numa_faults_locality[2]); show_numa_stats(p, m); mpol_put(pol); #endif -- 2.14.4.44.g2045bb6
