Re: [PATCH v6 6/9] mm: multigenerational lru: aging

[Michal Hocko]

On Tue 04-01-22 13:22:25, Yu Zhao wrote:
[...]
> +static void walk_mm(struct lruvec *lruvec, struct mm_struct *mm, struct lru_gen_mm_walk *walk)
> +{
> +	static const struct mm_walk_ops mm_walk_ops = {
> +		.test_walk = should_skip_vma,
> +		.p4d_entry = walk_pud_range,
> +	};
> +
> +	int err;
> +#ifdef CONFIG_MEMCG
> +	struct mem_cgroup *memcg = lruvec_memcg(lruvec);
> +#endif
> +
> +	walk->next_addr = FIRST_USER_ADDRESS;
> +
> +	do {
> +		unsigned long start = walk->next_addr;
> +		unsigned long end = mm->highest_vm_end;
> +
> +		err = -EBUSY;
> +
> +		rcu_read_lock();
> +#ifdef CONFIG_MEMCG
> +		if (memcg && atomic_read(&memcg->moving_account))
> +			goto contended;
> +#endif

Why do you need to check for moving_account?
-- 
Michal Hocko
SUSE Labs