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![Miaohe Lin](/assets/img/avatar_default.png)
We could use helper function pages_per_huge_page() to get the number of pages in a hstate to simplify the code slightly. Link: https://lkml.kernel.org/r/20210205084513.29624-1-linmiaohe@huawei.com Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> Reviewed-by: David Hildenbrand <david@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
806 lines
21 KiB
C
806 lines
21 KiB
C
/*
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*
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* Copyright IBM Corporation, 2012
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* Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
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*
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* Cgroup v2
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* Copyright (C) 2019 Red Hat, Inc.
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* Author: Giuseppe Scrivano <gscrivan@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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*/
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#include <linux/cgroup.h>
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#include <linux/page_counter.h>
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#include <linux/slab.h>
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#include <linux/hugetlb.h>
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#include <linux/hugetlb_cgroup.h>
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#define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val))
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#define MEMFILE_IDX(val) (((val) >> 16) & 0xffff)
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#define MEMFILE_ATTR(val) ((val) & 0xffff)
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#define hugetlb_cgroup_from_counter(counter, idx) \
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container_of(counter, struct hugetlb_cgroup, hugepage[idx])
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static struct hugetlb_cgroup *root_h_cgroup __read_mostly;
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static inline struct page_counter *
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__hugetlb_cgroup_counter_from_cgroup(struct hugetlb_cgroup *h_cg, int idx,
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bool rsvd)
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{
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if (rsvd)
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return &h_cg->rsvd_hugepage[idx];
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return &h_cg->hugepage[idx];
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}
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static inline struct page_counter *
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hugetlb_cgroup_counter_from_cgroup(struct hugetlb_cgroup *h_cg, int idx)
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{
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return __hugetlb_cgroup_counter_from_cgroup(h_cg, idx, false);
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}
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static inline struct page_counter *
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hugetlb_cgroup_counter_from_cgroup_rsvd(struct hugetlb_cgroup *h_cg, int idx)
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{
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return __hugetlb_cgroup_counter_from_cgroup(h_cg, idx, true);
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}
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static inline
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struct hugetlb_cgroup *hugetlb_cgroup_from_css(struct cgroup_subsys_state *s)
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{
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return s ? container_of(s, struct hugetlb_cgroup, css) : NULL;
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}
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static inline
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struct hugetlb_cgroup *hugetlb_cgroup_from_task(struct task_struct *task)
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{
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return hugetlb_cgroup_from_css(task_css(task, hugetlb_cgrp_id));
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}
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static inline bool hugetlb_cgroup_is_root(struct hugetlb_cgroup *h_cg)
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{
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return (h_cg == root_h_cgroup);
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}
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static inline struct hugetlb_cgroup *
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parent_hugetlb_cgroup(struct hugetlb_cgroup *h_cg)
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{
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return hugetlb_cgroup_from_css(h_cg->css.parent);
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}
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static inline bool hugetlb_cgroup_have_usage(struct hugetlb_cgroup *h_cg)
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{
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int idx;
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for (idx = 0; idx < hugetlb_max_hstate; idx++) {
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if (page_counter_read(
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hugetlb_cgroup_counter_from_cgroup(h_cg, idx)))
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return true;
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}
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return false;
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}
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static void hugetlb_cgroup_init(struct hugetlb_cgroup *h_cgroup,
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struct hugetlb_cgroup *parent_h_cgroup)
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{
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int idx;
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for (idx = 0; idx < HUGE_MAX_HSTATE; idx++) {
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struct page_counter *fault_parent = NULL;
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struct page_counter *rsvd_parent = NULL;
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unsigned long limit;
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int ret;
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if (parent_h_cgroup) {
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fault_parent = hugetlb_cgroup_counter_from_cgroup(
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parent_h_cgroup, idx);
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rsvd_parent = hugetlb_cgroup_counter_from_cgroup_rsvd(
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parent_h_cgroup, idx);
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}
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page_counter_init(hugetlb_cgroup_counter_from_cgroup(h_cgroup,
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idx),
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fault_parent);
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page_counter_init(
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hugetlb_cgroup_counter_from_cgroup_rsvd(h_cgroup, idx),
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rsvd_parent);
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limit = round_down(PAGE_COUNTER_MAX,
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pages_per_huge_page(&hstates[idx]));
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ret = page_counter_set_max(
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hugetlb_cgroup_counter_from_cgroup(h_cgroup, idx),
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limit);
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VM_BUG_ON(ret);
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ret = page_counter_set_max(
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hugetlb_cgroup_counter_from_cgroup_rsvd(h_cgroup, idx),
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limit);
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VM_BUG_ON(ret);
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}
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}
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static struct cgroup_subsys_state *
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hugetlb_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
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{
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struct hugetlb_cgroup *parent_h_cgroup = hugetlb_cgroup_from_css(parent_css);
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struct hugetlb_cgroup *h_cgroup;
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h_cgroup = kzalloc(sizeof(*h_cgroup), GFP_KERNEL);
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if (!h_cgroup)
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return ERR_PTR(-ENOMEM);
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if (!parent_h_cgroup)
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root_h_cgroup = h_cgroup;
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hugetlb_cgroup_init(h_cgroup, parent_h_cgroup);
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return &h_cgroup->css;
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}
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static void hugetlb_cgroup_css_free(struct cgroup_subsys_state *css)
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{
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struct hugetlb_cgroup *h_cgroup;
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h_cgroup = hugetlb_cgroup_from_css(css);
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kfree(h_cgroup);
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}
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/*
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* Should be called with hugetlb_lock held.
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* Since we are holding hugetlb_lock, pages cannot get moved from
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* active list or uncharged from the cgroup, So no need to get
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* page reference and test for page active here. This function
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* cannot fail.
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*/
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static void hugetlb_cgroup_move_parent(int idx, struct hugetlb_cgroup *h_cg,
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struct page *page)
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{
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unsigned int nr_pages;
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struct page_counter *counter;
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struct hugetlb_cgroup *page_hcg;
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struct hugetlb_cgroup *parent = parent_hugetlb_cgroup(h_cg);
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page_hcg = hugetlb_cgroup_from_page(page);
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/*
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* We can have pages in active list without any cgroup
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* ie, hugepage with less than 3 pages. We can safely
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* ignore those pages.
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*/
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if (!page_hcg || page_hcg != h_cg)
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goto out;
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nr_pages = compound_nr(page);
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if (!parent) {
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parent = root_h_cgroup;
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/* root has no limit */
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page_counter_charge(&parent->hugepage[idx], nr_pages);
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}
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counter = &h_cg->hugepage[idx];
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/* Take the pages off the local counter */
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page_counter_cancel(counter, nr_pages);
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set_hugetlb_cgroup(page, parent);
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out:
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return;
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}
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/*
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* Force the hugetlb cgroup to empty the hugetlb resources by moving them to
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* the parent cgroup.
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*/
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static void hugetlb_cgroup_css_offline(struct cgroup_subsys_state *css)
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{
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struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css);
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struct hstate *h;
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struct page *page;
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int idx;
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do {
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idx = 0;
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for_each_hstate(h) {
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spin_lock(&hugetlb_lock);
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list_for_each_entry(page, &h->hugepage_activelist, lru)
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hugetlb_cgroup_move_parent(idx, h_cg, page);
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spin_unlock(&hugetlb_lock);
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idx++;
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}
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cond_resched();
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} while (hugetlb_cgroup_have_usage(h_cg));
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}
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static inline void hugetlb_event(struct hugetlb_cgroup *hugetlb, int idx,
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enum hugetlb_memory_event event)
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{
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atomic_long_inc(&hugetlb->events_local[idx][event]);
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cgroup_file_notify(&hugetlb->events_local_file[idx]);
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do {
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atomic_long_inc(&hugetlb->events[idx][event]);
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cgroup_file_notify(&hugetlb->events_file[idx]);
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} while ((hugetlb = parent_hugetlb_cgroup(hugetlb)) &&
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!hugetlb_cgroup_is_root(hugetlb));
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}
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static int __hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup **ptr,
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bool rsvd)
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{
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int ret = 0;
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struct page_counter *counter;
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struct hugetlb_cgroup *h_cg = NULL;
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if (hugetlb_cgroup_disabled())
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goto done;
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/*
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* We don't charge any cgroup if the compound page have less
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* than 3 pages.
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*/
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if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER)
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goto done;
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again:
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rcu_read_lock();
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h_cg = hugetlb_cgroup_from_task(current);
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if (!css_tryget(&h_cg->css)) {
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rcu_read_unlock();
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goto again;
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}
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rcu_read_unlock();
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if (!page_counter_try_charge(
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__hugetlb_cgroup_counter_from_cgroup(h_cg, idx, rsvd),
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nr_pages, &counter)) {
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ret = -ENOMEM;
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hugetlb_event(h_cg, idx, HUGETLB_MAX);
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css_put(&h_cg->css);
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goto done;
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}
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/* Reservations take a reference to the css because they do not get
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* reparented.
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*/
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if (!rsvd)
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css_put(&h_cg->css);
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done:
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*ptr = h_cg;
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return ret;
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}
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int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup **ptr)
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{
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return __hugetlb_cgroup_charge_cgroup(idx, nr_pages, ptr, false);
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}
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int hugetlb_cgroup_charge_cgroup_rsvd(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup **ptr)
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{
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return __hugetlb_cgroup_charge_cgroup(idx, nr_pages, ptr, true);
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}
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/* Should be called with hugetlb_lock held */
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static void __hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup *h_cg,
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struct page *page, bool rsvd)
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{
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if (hugetlb_cgroup_disabled() || !h_cg)
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return;
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__set_hugetlb_cgroup(page, h_cg, rsvd);
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return;
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}
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void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup *h_cg,
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struct page *page)
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{
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__hugetlb_cgroup_commit_charge(idx, nr_pages, h_cg, page, false);
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}
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void hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup *h_cg,
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struct page *page)
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{
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__hugetlb_cgroup_commit_charge(idx, nr_pages, h_cg, page, true);
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}
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/*
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* Should be called with hugetlb_lock held
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*/
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static void __hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
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struct page *page, bool rsvd)
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{
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struct hugetlb_cgroup *h_cg;
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if (hugetlb_cgroup_disabled())
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return;
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lockdep_assert_held(&hugetlb_lock);
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h_cg = __hugetlb_cgroup_from_page(page, rsvd);
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if (unlikely(!h_cg))
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return;
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__set_hugetlb_cgroup(page, NULL, rsvd);
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page_counter_uncharge(__hugetlb_cgroup_counter_from_cgroup(h_cg, idx,
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rsvd),
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nr_pages);
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if (rsvd)
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css_put(&h_cg->css);
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return;
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}
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void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
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struct page *page)
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{
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__hugetlb_cgroup_uncharge_page(idx, nr_pages, page, false);
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}
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void hugetlb_cgroup_uncharge_page_rsvd(int idx, unsigned long nr_pages,
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struct page *page)
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{
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__hugetlb_cgroup_uncharge_page(idx, nr_pages, page, true);
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}
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static void __hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup *h_cg,
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bool rsvd)
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{
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if (hugetlb_cgroup_disabled() || !h_cg)
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return;
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if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER)
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return;
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page_counter_uncharge(__hugetlb_cgroup_counter_from_cgroup(h_cg, idx,
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rsvd),
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nr_pages);
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if (rsvd)
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css_put(&h_cg->css);
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}
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void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup *h_cg)
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{
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__hugetlb_cgroup_uncharge_cgroup(idx, nr_pages, h_cg, false);
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}
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void hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup *h_cg)
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{
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__hugetlb_cgroup_uncharge_cgroup(idx, nr_pages, h_cg, true);
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}
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void hugetlb_cgroup_uncharge_counter(struct resv_map *resv, unsigned long start,
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unsigned long end)
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{
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if (hugetlb_cgroup_disabled() || !resv || !resv->reservation_counter ||
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!resv->css)
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return;
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page_counter_uncharge(resv->reservation_counter,
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(end - start) * resv->pages_per_hpage);
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css_put(resv->css);
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}
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void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
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struct file_region *rg,
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unsigned long nr_pages)
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{
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if (hugetlb_cgroup_disabled() || !resv || !rg || !nr_pages)
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return;
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if (rg->reservation_counter && resv->pages_per_hpage && nr_pages > 0 &&
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!resv->reservation_counter) {
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page_counter_uncharge(rg->reservation_counter,
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nr_pages * resv->pages_per_hpage);
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css_put(rg->css);
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}
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}
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enum {
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RES_USAGE,
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RES_RSVD_USAGE,
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RES_LIMIT,
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RES_RSVD_LIMIT,
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RES_MAX_USAGE,
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RES_RSVD_MAX_USAGE,
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RES_FAILCNT,
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RES_RSVD_FAILCNT,
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};
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static u64 hugetlb_cgroup_read_u64(struct cgroup_subsys_state *css,
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struct cftype *cft)
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{
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struct page_counter *counter;
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struct page_counter *rsvd_counter;
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struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css);
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counter = &h_cg->hugepage[MEMFILE_IDX(cft->private)];
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rsvd_counter = &h_cg->rsvd_hugepage[MEMFILE_IDX(cft->private)];
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switch (MEMFILE_ATTR(cft->private)) {
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case RES_USAGE:
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return (u64)page_counter_read(counter) * PAGE_SIZE;
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case RES_RSVD_USAGE:
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return (u64)page_counter_read(rsvd_counter) * PAGE_SIZE;
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case RES_LIMIT:
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return (u64)counter->max * PAGE_SIZE;
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case RES_RSVD_LIMIT:
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return (u64)rsvd_counter->max * PAGE_SIZE;
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case RES_MAX_USAGE:
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return (u64)counter->watermark * PAGE_SIZE;
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case RES_RSVD_MAX_USAGE:
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return (u64)rsvd_counter->watermark * PAGE_SIZE;
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case RES_FAILCNT:
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return counter->failcnt;
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case RES_RSVD_FAILCNT:
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return rsvd_counter->failcnt;
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default:
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BUG();
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}
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}
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static int hugetlb_cgroup_read_u64_max(struct seq_file *seq, void *v)
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{
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int idx;
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u64 val;
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struct cftype *cft = seq_cft(seq);
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unsigned long limit;
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struct page_counter *counter;
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struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(seq_css(seq));
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idx = MEMFILE_IDX(cft->private);
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counter = &h_cg->hugepage[idx];
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limit = round_down(PAGE_COUNTER_MAX,
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pages_per_huge_page(&hstates[idx]));
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switch (MEMFILE_ATTR(cft->private)) {
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case RES_RSVD_USAGE:
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counter = &h_cg->rsvd_hugepage[idx];
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fallthrough;
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case RES_USAGE:
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val = (u64)page_counter_read(counter);
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seq_printf(seq, "%llu\n", val * PAGE_SIZE);
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break;
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case RES_RSVD_LIMIT:
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counter = &h_cg->rsvd_hugepage[idx];
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fallthrough;
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case RES_LIMIT:
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val = (u64)counter->max;
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if (val == limit)
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seq_puts(seq, "max\n");
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else
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seq_printf(seq, "%llu\n", val * PAGE_SIZE);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static DEFINE_MUTEX(hugetlb_limit_mutex);
|
|
|
|
static ssize_t hugetlb_cgroup_write(struct kernfs_open_file *of,
|
|
char *buf, size_t nbytes, loff_t off,
|
|
const char *max)
|
|
{
|
|
int ret, idx;
|
|
unsigned long nr_pages;
|
|
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of));
|
|
bool rsvd = false;
|
|
|
|
if (hugetlb_cgroup_is_root(h_cg)) /* Can't set limit on root */
|
|
return -EINVAL;
|
|
|
|
buf = strstrip(buf);
|
|
ret = page_counter_memparse(buf, max, &nr_pages);
|
|
if (ret)
|
|
return ret;
|
|
|
|
idx = MEMFILE_IDX(of_cft(of)->private);
|
|
nr_pages = round_down(nr_pages, pages_per_huge_page(&hstates[idx]));
|
|
|
|
switch (MEMFILE_ATTR(of_cft(of)->private)) {
|
|
case RES_RSVD_LIMIT:
|
|
rsvd = true;
|
|
fallthrough;
|
|
case RES_LIMIT:
|
|
mutex_lock(&hugetlb_limit_mutex);
|
|
ret = page_counter_set_max(
|
|
__hugetlb_cgroup_counter_from_cgroup(h_cg, idx, rsvd),
|
|
nr_pages);
|
|
mutex_unlock(&hugetlb_limit_mutex);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
return ret ?: nbytes;
|
|
}
|
|
|
|
static ssize_t hugetlb_cgroup_write_legacy(struct kernfs_open_file *of,
|
|
char *buf, size_t nbytes, loff_t off)
|
|
{
|
|
return hugetlb_cgroup_write(of, buf, nbytes, off, "-1");
|
|
}
|
|
|
|
static ssize_t hugetlb_cgroup_write_dfl(struct kernfs_open_file *of,
|
|
char *buf, size_t nbytes, loff_t off)
|
|
{
|
|
return hugetlb_cgroup_write(of, buf, nbytes, off, "max");
|
|
}
|
|
|
|
static ssize_t hugetlb_cgroup_reset(struct kernfs_open_file *of,
|
|
char *buf, size_t nbytes, loff_t off)
|
|
{
|
|
int ret = 0;
|
|
struct page_counter *counter, *rsvd_counter;
|
|
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of));
|
|
|
|
counter = &h_cg->hugepage[MEMFILE_IDX(of_cft(of)->private)];
|
|
rsvd_counter = &h_cg->rsvd_hugepage[MEMFILE_IDX(of_cft(of)->private)];
|
|
|
|
switch (MEMFILE_ATTR(of_cft(of)->private)) {
|
|
case RES_MAX_USAGE:
|
|
page_counter_reset_watermark(counter);
|
|
break;
|
|
case RES_RSVD_MAX_USAGE:
|
|
page_counter_reset_watermark(rsvd_counter);
|
|
break;
|
|
case RES_FAILCNT:
|
|
counter->failcnt = 0;
|
|
break;
|
|
case RES_RSVD_FAILCNT:
|
|
rsvd_counter->failcnt = 0;
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
return ret ?: nbytes;
|
|
}
|
|
|
|
static char *mem_fmt(char *buf, int size, unsigned long hsize)
|
|
{
|
|
if (hsize >= (1UL << 30))
|
|
snprintf(buf, size, "%luGB", hsize >> 30);
|
|
else if (hsize >= (1UL << 20))
|
|
snprintf(buf, size, "%luMB", hsize >> 20);
|
|
else
|
|
snprintf(buf, size, "%luKB", hsize >> 10);
|
|
return buf;
|
|
}
|
|
|
|
static int __hugetlb_events_show(struct seq_file *seq, bool local)
|
|
{
|
|
int idx;
|
|
long max;
|
|
struct cftype *cft = seq_cft(seq);
|
|
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(seq_css(seq));
|
|
|
|
idx = MEMFILE_IDX(cft->private);
|
|
|
|
if (local)
|
|
max = atomic_long_read(&h_cg->events_local[idx][HUGETLB_MAX]);
|
|
else
|
|
max = atomic_long_read(&h_cg->events[idx][HUGETLB_MAX]);
|
|
|
|
seq_printf(seq, "max %lu\n", max);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hugetlb_events_show(struct seq_file *seq, void *v)
|
|
{
|
|
return __hugetlb_events_show(seq, false);
|
|
}
|
|
|
|
static int hugetlb_events_local_show(struct seq_file *seq, void *v)
|
|
{
|
|
return __hugetlb_events_show(seq, true);
|
|
}
|
|
|
|
static void __init __hugetlb_cgroup_file_dfl_init(int idx)
|
|
{
|
|
char buf[32];
|
|
struct cftype *cft;
|
|
struct hstate *h = &hstates[idx];
|
|
|
|
/* format the size */
|
|
mem_fmt(buf, sizeof(buf), huge_page_size(h));
|
|
|
|
/* Add the limit file */
|
|
cft = &h->cgroup_files_dfl[0];
|
|
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.max", buf);
|
|
cft->private = MEMFILE_PRIVATE(idx, RES_LIMIT);
|
|
cft->seq_show = hugetlb_cgroup_read_u64_max;
|
|
cft->write = hugetlb_cgroup_write_dfl;
|
|
cft->flags = CFTYPE_NOT_ON_ROOT;
|
|
|
|
/* Add the reservation limit file */
|
|
cft = &h->cgroup_files_dfl[1];
|
|
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.max", buf);
|
|
cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_LIMIT);
|
|
cft->seq_show = hugetlb_cgroup_read_u64_max;
|
|
cft->write = hugetlb_cgroup_write_dfl;
|
|
cft->flags = CFTYPE_NOT_ON_ROOT;
|
|
|
|
/* Add the current usage file */
|
|
cft = &h->cgroup_files_dfl[2];
|
|
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.current", buf);
|
|
cft->private = MEMFILE_PRIVATE(idx, RES_USAGE);
|
|
cft->seq_show = hugetlb_cgroup_read_u64_max;
|
|
cft->flags = CFTYPE_NOT_ON_ROOT;
|
|
|
|
/* Add the current reservation usage file */
|
|
cft = &h->cgroup_files_dfl[3];
|
|
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.current", buf);
|
|
cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_USAGE);
|
|
cft->seq_show = hugetlb_cgroup_read_u64_max;
|
|
cft->flags = CFTYPE_NOT_ON_ROOT;
|
|
|
|
/* Add the events file */
|
|
cft = &h->cgroup_files_dfl[4];
|
|
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.events", buf);
|
|
cft->private = MEMFILE_PRIVATE(idx, 0);
|
|
cft->seq_show = hugetlb_events_show;
|
|
cft->file_offset = offsetof(struct hugetlb_cgroup, events_file[idx]);
|
|
cft->flags = CFTYPE_NOT_ON_ROOT;
|
|
|
|
/* Add the events.local file */
|
|
cft = &h->cgroup_files_dfl[5];
|
|
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.events.local", buf);
|
|
cft->private = MEMFILE_PRIVATE(idx, 0);
|
|
cft->seq_show = hugetlb_events_local_show;
|
|
cft->file_offset = offsetof(struct hugetlb_cgroup,
|
|
events_local_file[idx]);
|
|
cft->flags = CFTYPE_NOT_ON_ROOT;
|
|
|
|
/* NULL terminate the last cft */
|
|
cft = &h->cgroup_files_dfl[6];
|
|
memset(cft, 0, sizeof(*cft));
|
|
|
|
WARN_ON(cgroup_add_dfl_cftypes(&hugetlb_cgrp_subsys,
|
|
h->cgroup_files_dfl));
|
|
}
|
|
|
|
static void __init __hugetlb_cgroup_file_legacy_init(int idx)
|
|
{
|
|
char buf[32];
|
|
struct cftype *cft;
|
|
struct hstate *h = &hstates[idx];
|
|
|
|
/* format the size */
|
|
mem_fmt(buf, sizeof(buf), huge_page_size(h));
|
|
|
|
/* Add the limit file */
|
|
cft = &h->cgroup_files_legacy[0];
|
|
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.limit_in_bytes", buf);
|
|
cft->private = MEMFILE_PRIVATE(idx, RES_LIMIT);
|
|
cft->read_u64 = hugetlb_cgroup_read_u64;
|
|
cft->write = hugetlb_cgroup_write_legacy;
|
|
|
|
/* Add the reservation limit file */
|
|
cft = &h->cgroup_files_legacy[1];
|
|
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.limit_in_bytes", buf);
|
|
cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_LIMIT);
|
|
cft->read_u64 = hugetlb_cgroup_read_u64;
|
|
cft->write = hugetlb_cgroup_write_legacy;
|
|
|
|
/* Add the usage file */
|
|
cft = &h->cgroup_files_legacy[2];
|
|
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.usage_in_bytes", buf);
|
|
cft->private = MEMFILE_PRIVATE(idx, RES_USAGE);
|
|
cft->read_u64 = hugetlb_cgroup_read_u64;
|
|
|
|
/* Add the reservation usage file */
|
|
cft = &h->cgroup_files_legacy[3];
|
|
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.usage_in_bytes", buf);
|
|
cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_USAGE);
|
|
cft->read_u64 = hugetlb_cgroup_read_u64;
|
|
|
|
/* Add the MAX usage file */
|
|
cft = &h->cgroup_files_legacy[4];
|
|
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.max_usage_in_bytes", buf);
|
|
cft->private = MEMFILE_PRIVATE(idx, RES_MAX_USAGE);
|
|
cft->write = hugetlb_cgroup_reset;
|
|
cft->read_u64 = hugetlb_cgroup_read_u64;
|
|
|
|
/* Add the MAX reservation usage file */
|
|
cft = &h->cgroup_files_legacy[5];
|
|
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.max_usage_in_bytes", buf);
|
|
cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_MAX_USAGE);
|
|
cft->write = hugetlb_cgroup_reset;
|
|
cft->read_u64 = hugetlb_cgroup_read_u64;
|
|
|
|
/* Add the failcntfile */
|
|
cft = &h->cgroup_files_legacy[6];
|
|
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.failcnt", buf);
|
|
cft->private = MEMFILE_PRIVATE(idx, RES_FAILCNT);
|
|
cft->write = hugetlb_cgroup_reset;
|
|
cft->read_u64 = hugetlb_cgroup_read_u64;
|
|
|
|
/* Add the reservation failcntfile */
|
|
cft = &h->cgroup_files_legacy[7];
|
|
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.failcnt", buf);
|
|
cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_FAILCNT);
|
|
cft->write = hugetlb_cgroup_reset;
|
|
cft->read_u64 = hugetlb_cgroup_read_u64;
|
|
|
|
/* NULL terminate the last cft */
|
|
cft = &h->cgroup_files_legacy[8];
|
|
memset(cft, 0, sizeof(*cft));
|
|
|
|
WARN_ON(cgroup_add_legacy_cftypes(&hugetlb_cgrp_subsys,
|
|
h->cgroup_files_legacy));
|
|
}
|
|
|
|
static void __init __hugetlb_cgroup_file_init(int idx)
|
|
{
|
|
__hugetlb_cgroup_file_dfl_init(idx);
|
|
__hugetlb_cgroup_file_legacy_init(idx);
|
|
}
|
|
|
|
void __init hugetlb_cgroup_file_init(void)
|
|
{
|
|
struct hstate *h;
|
|
|
|
for_each_hstate(h) {
|
|
/*
|
|
* Add cgroup control files only if the huge page consists
|
|
* of more than two normal pages. This is because we use
|
|
* page[2].private for storing cgroup details.
|
|
*/
|
|
if (huge_page_order(h) >= HUGETLB_CGROUP_MIN_ORDER)
|
|
__hugetlb_cgroup_file_init(hstate_index(h));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* hugetlb_lock will make sure a parallel cgroup rmdir won't happen
|
|
* when we migrate hugepages
|
|
*/
|
|
void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
|
|
{
|
|
struct hugetlb_cgroup *h_cg;
|
|
struct hugetlb_cgroup *h_cg_rsvd;
|
|
struct hstate *h = page_hstate(oldhpage);
|
|
|
|
if (hugetlb_cgroup_disabled())
|
|
return;
|
|
|
|
VM_BUG_ON_PAGE(!PageHuge(oldhpage), oldhpage);
|
|
spin_lock(&hugetlb_lock);
|
|
h_cg = hugetlb_cgroup_from_page(oldhpage);
|
|
h_cg_rsvd = hugetlb_cgroup_from_page_rsvd(oldhpage);
|
|
set_hugetlb_cgroup(oldhpage, NULL);
|
|
set_hugetlb_cgroup_rsvd(oldhpage, NULL);
|
|
|
|
/* move the h_cg details to new cgroup */
|
|
set_hugetlb_cgroup(newhpage, h_cg);
|
|
set_hugetlb_cgroup_rsvd(newhpage, h_cg_rsvd);
|
|
list_move(&newhpage->lru, &h->hugepage_activelist);
|
|
spin_unlock(&hugetlb_lock);
|
|
return;
|
|
}
|
|
|
|
static struct cftype hugetlb_files[] = {
|
|
{} /* terminate */
|
|
};
|
|
|
|
struct cgroup_subsys hugetlb_cgrp_subsys = {
|
|
.css_alloc = hugetlb_cgroup_css_alloc,
|
|
.css_offline = hugetlb_cgroup_css_offline,
|
|
.css_free = hugetlb_cgroup_css_free,
|
|
.dfl_cftypes = hugetlb_files,
|
|
.legacy_cftypes = hugetlb_files,
|
|
};
|