Messages in this thread Patch in this message | | | From | Honglei Wang <> | Subject | [PATCH] sched/numa: initialize numa statistics when forking new task | Date | Thu, 13 Jan 2022 21:39:20 +0800 |
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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@didichuxing.com> --- kernel/sched/fair.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 6e476f6d9435..1aa0ec123a4b 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -2826,6 +2826,8 @@ 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; -- 2.14.1
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