Re: [PATCH v7 2/7] mm: migrate: Add promote_misplaced_memcg_folios()

[Donet Tom <donettom@linux.ibm.com>]

Hi Bharata

On 5/4/26 11:39 AM, Bharata B Rao wrote:
> +int promote_misplaced_memcg_folios(struct list_head *folio_list, int node)
> +{
> +	struct mem_cgroup *memcg = NULL;
> +	unsigned int nr_succeeded = 0;
> +	struct folio *first;
> +	int nr_remaining;
> +
> +	if (list_empty(folio_list))
> +		return 0;
> +
> +	first = list_first_entry(folio_list, struct folio, lru);
> +#ifdef CONFIG_DEBUG_VM
> +	{
> +		struct folio *f;
> +		list_for_each_entry(f, folio_list, lru)
> +		VM_WARN_ON_ONCE(folio_memcg(f) != folio_memcg(first));


It looks like the indentation might be off here.


> +	}
> +#endif
> +	memcg = get_mem_cgroup_from_folio(first);
> +
> +	nr_remaining = migrate_pages(folio_list, alloc_misplaced_dst_folio,
> +				     NULL, node, MIGRATE_ASYNC,
> +				     MR_NUMA_MISPLACED, &nr_succeeded);
> +	if (nr_remaining)
> +		putback_movable_pages(folio_list);
> +
> +	if (nr_succeeded) {
> +		count_vm_numa_events(NUMA_PAGE_MIGRATE, nr_succeeded);
> +		count_memcg_events(memcg, NUMA_PAGE_MIGRATE, nr_succeeded);
> +		mod_lruvec_state(mem_cgroup_lruvec(memcg, NODE_DATA(node)),
> +				 PGPROMOTE_SUCCESS, nr_succeeded);
> +	}
> +
> +	mem_cgroup_put(memcg);
> +	WARN_ON(!list_empty(folio_list));
> +	return nr_remaining ? -EAGAIN : 0;
> +}
>   #endif /* CONFIG_NUMA_BALANCING */