Tejun Heo <t...@kernel.org> writes:
> cgroup controller API will be converted to primarily use struct
> cgroup_subsys_state instead of struct cgroup. In preparation, make
> hugetlb_cgroup functions pass around struct hugetlb_cgroup instead of
> struct cgroup.
>
> This patch shouldn't cause any behavior differences.
>
> Signed-off-by: Tejun Heo <t...@kernel.org>
> Cc: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hir...@jp.fujitsu.com>
> Cc: Michal Hocko <mho...@suse.cz>
> Cc: Johannes Weiner <han...@cmpxchg.org>
Reviewed-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
> ---
> mm/hugetlb_cgroup.c | 22 ++++++++++++----------
> 1 file changed, 12 insertions(+), 10 deletions(-)
>
> diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
> index 50f213f..d2f9fc0 100644
> --- a/mm/hugetlb_cgroup.c
> +++ b/mm/hugetlb_cgroup.c
> @@ -56,17 +56,19 @@ static inline bool hugetlb_cgroup_is_root(struct
> hugetlb_cgroup *h_cg)
> return (h_cg == root_h_cgroup);
> }
>
> -static inline struct hugetlb_cgroup *parent_hugetlb_cgroup(struct cgroup *cg)
> +static inline struct hugetlb_cgroup *
> +parent_hugetlb_cgroup(struct hugetlb_cgroup *h_cg)
> {
> - if (!cg->parent)
> + struct cgroup *parent = h_cg->css.cgroup->parent;
> +
> + if (!parent)
> return NULL;
> - return hugetlb_cgroup_from_cgroup(cg->parent);
> + return hugetlb_cgroup_from_cgroup(parent);
> }
>
> -static inline bool hugetlb_cgroup_have_usage(struct cgroup *cg)
> +static inline bool hugetlb_cgroup_have_usage(struct hugetlb_cgroup *h_cg)
> {
> int idx;
> - struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_cgroup(cg);
>
> for (idx = 0; idx < hugetlb_max_hstate; idx++) {
> if ((res_counter_read_u64(&h_cg->hugepage[idx], RES_USAGE)) > 0)
> @@ -115,15 +117,14 @@ static void hugetlb_cgroup_css_free(struct cgroup
> *cgroup)
> * page reference and test for page active here. This function
> * cannot fail.
> */
> -static void hugetlb_cgroup_move_parent(int idx, struct cgroup *cgroup,
> +static void hugetlb_cgroup_move_parent(int idx, struct hugetlb_cgroup *h_cg,
> struct page *page)
> {
> int csize;
> struct res_counter *counter;
> struct res_counter *fail_res;
> struct hugetlb_cgroup *page_hcg;
> - struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_cgroup(cgroup);
> - struct hugetlb_cgroup *parent = parent_hugetlb_cgroup(cgroup);
> + struct hugetlb_cgroup *parent = parent_hugetlb_cgroup(h_cg);
>
> page_hcg = hugetlb_cgroup_from_page(page);
> /*
> @@ -155,6 +156,7 @@ out:
> */
> static void hugetlb_cgroup_css_offline(struct cgroup *cgroup)
> {
> + struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_cgroup(cgroup);
> struct hstate *h;
> struct page *page;
> int idx = 0;
> @@ -163,13 +165,13 @@ static void hugetlb_cgroup_css_offline(struct cgroup
> *cgroup)
> for_each_hstate(h) {
> spin_lock(&hugetlb_lock);
> list_for_each_entry(page, &h->hugepage_activelist, lru)
> - hugetlb_cgroup_move_parent(idx, cgroup, page);
> + hugetlb_cgroup_move_parent(idx, h_cg, page);
>
> spin_unlock(&hugetlb_lock);
> idx++;
> }
> cond_resched();
> - } while (hugetlb_cgroup_have_usage(cgroup));
> + } while (hugetlb_cgroup_have_usage(h_cg));
> }
>
> int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
> --
> 1.8.3.1
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