Commit 12bf8a7e authored by Honglei Wang's avatar Honglei Wang Committed by Peter Zijlstra
Browse files

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: default avatarHonglei Wang <wanghonglei@didichuxing.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: default avatarMel Gorman <mgorman@suse.de>
Link: https://lore.kernel.org/r/20220113133920.49900-1-wanghonglei@didichuxing.com
parent 28c988c3

kernel/sched/fair.c

+2 −0
Original line number Diff line number Diff line
@@ -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;