From: Roman Gushchin <guro@xxxxxx> Subject: mm: kmem: switch to nr_pages in (__)memcg_kmem_charge_memcg() These functions are charging the given number of kernel pages to the given memory cgroup. The number doesn't have to be a power of two. Let's make them to take the unsigned int nr_pages as an argument instead of the page order. It makes them look consistent with the corresponding uncharge functions and functions like: mem_cgroup_charge_skmem(memcg, nr_pages). Link: http://lkml.kernel.org/r/20200109202659.752357-5-guro@xxxxxx Signed-off-by: Roman Gushchin <guro@xxxxxx> Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx> Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxxxx> Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/memcontrol.h | 11 ++++++----- mm/memcontrol.c | 8 ++++---- mm/slab.h | 2 +- 3 files changed, 11 insertions(+), 10 deletions(-) --- a/include/linux/memcontrol.h~mm-kmem-switch-to-nr_pages-in-__memcg_kmem_charge_memcg +++ a/include/linux/memcontrol.h @@ -1369,7 +1369,8 @@ void memcg_kmem_put_cache(struct kmem_ca #ifdef CONFIG_MEMCG_KMEM int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, int order); void __memcg_kmem_uncharge_page(struct page *page, int order); -int __memcg_kmem_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp, int order); +int __memcg_kmem_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp, + unsigned int nr_pages); void __memcg_kmem_uncharge_memcg(struct mem_cgroup *memcg, unsigned int nr_pages); @@ -1408,18 +1409,18 @@ static inline void memcg_kmem_uncharge_p } static inline int memcg_kmem_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp, - int order) + unsigned int nr_pages) { if (memcg_kmem_enabled()) - return __memcg_kmem_charge_memcg(memcg, gfp, order); + return __memcg_kmem_charge_memcg(memcg, gfp, nr_pages); return 0; } static inline void memcg_kmem_uncharge_memcg(struct mem_cgroup *memcg, - int order) + unsigned int nr_pages) { if (memcg_kmem_enabled()) - __memcg_kmem_uncharge_memcg(memcg, 1 << order); + __memcg_kmem_uncharge_memcg(memcg, nr_pages); } /* --- a/mm/memcontrol.c~mm-kmem-switch-to-nr_pages-in-__memcg_kmem_charge_memcg +++ a/mm/memcontrol.c @@ -2884,13 +2884,13 @@ void memcg_kmem_put_cache(struct kmem_ca * __memcg_kmem_charge_memcg: charge a kmem page * @memcg: memory cgroup to charge * @gfp: reclaim mode - * @order: allocation order + * @nr_pages: number of pages to charge * * Returns 0 on success, an error code on failure. */ -int __memcg_kmem_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp, int order) +int __memcg_kmem_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp, + unsigned int nr_pages) { - unsigned int nr_pages = 1 << order; struct page_counter *counter; int ret; @@ -2934,7 +2934,7 @@ int __memcg_kmem_charge_page(struct page memcg = get_mem_cgroup_from_current(); if (!mem_cgroup_is_root(memcg)) { - ret = __memcg_kmem_charge_memcg(memcg, gfp, order); + ret = __memcg_kmem_charge_memcg(memcg, gfp, 1 << order); if (!ret) { page->mem_cgroup = memcg; __SetPageKmemcg(page); --- a/mm/slab.h~mm-kmem-switch-to-nr_pages-in-__memcg_kmem_charge_memcg +++ a/mm/slab.h @@ -365,7 +365,7 @@ static __always_inline int memcg_charge_ return 0; } - ret = memcg_kmem_charge_memcg(memcg, gfp, order); + ret = memcg_kmem_charge_memcg(memcg, gfp, 1 << order); if (ret) goto out; _
