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SubjectRe: [PATCH 4/5] mm: rework non-root kmem_cache lifecycle management
On Wed, 17 Apr 2019, Roman Gushchin wrote:

> static __always_inline int memcg_charge_slab(struct page *page,
> gfp_t gfp, int order,
> struct kmem_cache *s)
> {
> - if (is_root_cache(s))
> + int idx = (s->flags & SLAB_RECLAIM_ACCOUNT) ?
> + NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE;
> + struct mem_cgroup *memcg;
> + struct lruvec *lruvec;
> + int ret;
> +
> + if (is_root_cache(s)) {
> + mod_node_page_state(page_pgdat(page), idx, 1 << order);

Hmmm... This is functionality that is not memcg specific being moved into
a memcg function??? Maybe rename the function to indicate that it is not
memcg specific and add the proper #ifdefs?

> static __always_inline void memcg_uncharge_slab(struct page *page, int order,
> struct kmem_cache *s)
> {
> - memcg_kmem_uncharge(page, order);
> + int idx = (s->flags & SLAB_RECLAIM_ACCOUNT) ?
> + NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE;
> + struct mem_cgroup *memcg;
> + struct lruvec *lruvec;
> +
> + if (is_root_cache(s)) {
> + mod_node_page_state(page_pgdat(page), idx, -(1 << order));
> + return;
> + }

And again.

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