On Mon, May 05, 2025 at 11:03:10PM +0800, "Chen, Yu C" <yu.c.chen@xxxxxxxxx> wrote:
> According to this address,
> 4c 8b af 50 09 00 00 mov 0x950(%rdi),%r13 <--- r13 = p->mm;
> 49 8b bd 98 04 00 00 mov 0x498(%r13),%rdi <--- p->mm->owner
> It seems that this task to be swapped has NULL mm_struct.
So it's likely a kernel thread. Does it make sense to NUMA balance
those? (I naïvely think it doesn't, please correct me.) ...
> static void __migrate_swap_task(struct task_struct *p, int cpu)
> {
> __schedstat_inc(p->stats.numa_task_swapped);
> - count_memcg_event_mm(p->mm, NUMA_TASK_SWAP);
> + if (p->mm)
> + count_memcg_event_mm(p->mm, NUMA_TASK_SWAP);
... proper fix should likely guard this earlier, like the guard in
task_numa_fault() but for the other swapped task.
Michal
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