The following commit has been merged into the sched/core branch of tip: Commit-ID: 12bf8a7eb84e4d3547ebfd89bb0a9255a0f2acc7 Gitweb: https://git.kernel.org/tip/12bf8a7eb84e4d3547ebfd89bb0a9255a0f2acc7 Author: Honglei Wang <wanghonglei@xxxxxxxxxxxxxxx> AuthorDate: Thu, 13 Jan 2022 21:39:20 +08:00 Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx> CommitterDate: Thu, 27 Jan 2022 12:57:18 +01:00 sched/numa: initialize numa statistics when forking new task The child processes will inherit numa_pages_migrated and total_numa_faults from the parent. It means even if there is no numa fault happen on the child, the statistics in /proc/$pid of the child process might show huge amount. This is a bit weird. Let's initialize them when do fork. Signed-off-by: Honglei Wang <wanghonglei@xxxxxxxxxxxxxxx> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Acked-by: Mel Gorman <mgorman@xxxxxxx> Link: https://lore.kernel.org/r/20220113133920.49900-1-wanghonglei@xxxxxxxxxxxxxxx --- kernel/sched/fair.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 095b0aa..5dca13f 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -2825,6 +2825,8 @@ void init_numa_balancing(unsigned long clone_flags, struct task_struct *p) /* Protect against double add, see task_tick_numa and task_numa_work */ p->numa_work.next = &p->numa_work; p->numa_faults = NULL; + p->numa_pages_migrated = 0; + p->total_numa_faults = 0; RCU_INIT_POINTER(p->numa_group, NULL); p->last_task_numa_placement = 0; p->last_sum_exec_runtime = 0;
|