From: Honglei Wang Date: Thu, 13 Jan 2022 13:39:20 +0000 (+0800) Subject: sched/numa: initialize numa statistics when forking new task X-Git-Tag: v5.18-rc1~169^2~67 X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=12bf8a7eb84e4d3547ebfd89bb0a9255a0f2acc7;p=tomoyo%2Ftomoyo-test1.git 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 Signed-off-by: Peter Zijlstra (Intel) Acked-by: Mel Gorman Link: https://lore.kernel.org/r/20220113133920.49900-1-wanghonglei@didichuxing.com --- diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 095b0aa378df..5dca13ff89f2 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;