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![Tejun Heo](/assets/img/avatar_default.png)
cgroup is currently in the process of transitioning to using struct cgroup_subsys_state * as the primary handle instead of struct cgroup. Please see the previous commit which converts the subsystem methods for rationale. This patch converts all cftype file operations to take @css instead of @cgroup. cftypes for the cgroup core files don't have their subsytem pointer set. These will automatically use the dummy_css added by the previous patch and can be converted the same way. Most subsystem conversions are straight forwards but there are some interesting ones. * freezer: update_if_frozen() is also converted to take @css instead of @cgroup for consistency. This will make the code look simpler too once iterators are converted to use css. * memory/vmpressure: mem_cgroup_from_css() needs to be exported to vmpressure while mem_cgroup_from_cont() can be made static. Updated accordingly. * cpu: cgroup_tg() doesn't have any user left. Removed. * cpuacct: cgroup_ca() doesn't have any user left. Removed. * hugetlb: hugetlb_cgroup_form_cgroup() doesn't have any user left. Removed. * net_cls: cgrp_cls_state() doesn't have any user left. Removed. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizefan@huawei.com> Acked-by: Michal Hocko <mhocko@suse.cz> Acked-by: Vivek Goyal <vgoyal@redhat.com> Acked-by: Aristeu Rozanski <aris@redhat.com> Acked-by: Daniel Wagner <daniel.wagner@bmw-carit.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Balbir Singh <bsingharora@gmail.com> Cc: Matt Helsley <matthltc@us.ibm.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Steven Rostedt <rostedt@goodmis.org>
417 lines
10 KiB
C
417 lines
10 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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* 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/slab.h>
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#include <linux/hugetlb.h>
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#include <linux/hugetlb_cgroup.h>
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struct hugetlb_cgroup {
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struct cgroup_subsys_state css;
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/*
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* the counter to account for hugepages from hugetlb.
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*/
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struct res_counter hugepage[HUGE_MAX_HSTATE];
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};
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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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struct cgroup_subsys hugetlb_subsys __read_mostly;
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static struct hugetlb_cgroup *root_h_cgroup __read_mostly;
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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_subsys_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(css_parent(&h_cg->css));
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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 ((res_counter_read_u64(&h_cg->hugepage[idx], RES_USAGE)) > 0)
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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 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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int idx;
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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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for (idx = 0; idx < HUGE_MAX_HSTATE; idx++)
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res_counter_init(&h_cgroup->hugepage[idx],
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&parent_h_cgroup->hugepage[idx]);
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} else {
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root_h_cgroup = h_cgroup;
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for (idx = 0; idx < HUGE_MAX_HSTATE; idx++)
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res_counter_init(&h_cgroup->hugepage[idx], NULL);
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}
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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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int csize;
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struct res_counter *counter;
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struct res_counter *fail_res;
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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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csize = PAGE_SIZE << compound_order(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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res_counter_charge_nofail(&parent->hugepage[idx],
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csize, &fail_res);
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}
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counter = &h_cg->hugepage[idx];
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res_counter_uncharge_until(counter, counter->parent, csize);
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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 = 0;
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do {
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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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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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int ret = 0;
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struct res_counter *fail_res;
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struct hugetlb_cgroup *h_cg = NULL;
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unsigned long csize = nr_pages * PAGE_SIZE;
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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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ret = res_counter_charge(&h_cg->hugepage[idx], csize, &fail_res);
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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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/* Should be called with hugetlb_lock held */
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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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if (hugetlb_cgroup_disabled() || !h_cg)
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return;
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set_hugetlb_cgroup(page, h_cg);
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return;
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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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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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struct hugetlb_cgroup *h_cg;
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unsigned long csize = nr_pages * PAGE_SIZE;
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if (hugetlb_cgroup_disabled())
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return;
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VM_BUG_ON(!spin_is_locked(&hugetlb_lock));
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h_cg = hugetlb_cgroup_from_page(page);
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if (unlikely(!h_cg))
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return;
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set_hugetlb_cgroup(page, NULL);
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res_counter_uncharge(&h_cg->hugepage[idx], csize);
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return;
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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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unsigned long csize = nr_pages * PAGE_SIZE;
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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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res_counter_uncharge(&h_cg->hugepage[idx], csize);
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return;
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}
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static ssize_t hugetlb_cgroup_read(struct cgroup_subsys_state *css,
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struct cftype *cft, struct file *file,
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char __user *buf, size_t nbytes,
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loff_t *ppos)
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{
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u64 val;
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char str[64];
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int idx, name, len;
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struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css);
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idx = MEMFILE_IDX(cft->private);
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name = MEMFILE_ATTR(cft->private);
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val = res_counter_read_u64(&h_cg->hugepage[idx], name);
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len = scnprintf(str, sizeof(str), "%llu\n", (unsigned long long)val);
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return simple_read_from_buffer(buf, nbytes, ppos, str, len);
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}
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static int hugetlb_cgroup_write(struct cgroup_subsys_state *css,
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struct cftype *cft, const char *buffer)
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{
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int idx, name, ret;
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unsigned long long val;
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struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css);
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idx = MEMFILE_IDX(cft->private);
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name = MEMFILE_ATTR(cft->private);
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switch (name) {
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case RES_LIMIT:
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if (hugetlb_cgroup_is_root(h_cg)) {
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/* Can't set limit on root */
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ret = -EINVAL;
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break;
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}
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/* This function does all necessary parse...reuse it */
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ret = res_counter_memparse_write_strategy(buffer, &val);
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if (ret)
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break;
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ret = res_counter_set_limit(&h_cg->hugepage[idx], val);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static int hugetlb_cgroup_reset(struct cgroup_subsys_state *css,
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unsigned int event)
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{
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int idx, name, ret = 0;
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struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css);
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idx = MEMFILE_IDX(event);
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name = MEMFILE_ATTR(event);
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switch (name) {
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case RES_MAX_USAGE:
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res_counter_reset_max(&h_cg->hugepage[idx]);
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break;
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case RES_FAILCNT:
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res_counter_reset_failcnt(&h_cg->hugepage[idx]);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static char *mem_fmt(char *buf, int size, unsigned long hsize)
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{
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if (hsize >= (1UL << 30))
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snprintf(buf, size, "%luGB", hsize >> 30);
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else if (hsize >= (1UL << 20))
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snprintf(buf, size, "%luMB", hsize >> 20);
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else
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snprintf(buf, size, "%luKB", hsize >> 10);
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return buf;
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}
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static void __init __hugetlb_cgroup_file_init(int idx)
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{
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char buf[32];
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struct cftype *cft;
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struct hstate *h = &hstates[idx];
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/* format the size */
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mem_fmt(buf, 32, huge_page_size(h));
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/* Add the limit file */
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cft = &h->cgroup_files[0];
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snprintf(cft->name, MAX_CFTYPE_NAME, "%s.limit_in_bytes", buf);
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cft->private = MEMFILE_PRIVATE(idx, RES_LIMIT);
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cft->read = hugetlb_cgroup_read;
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cft->write_string = hugetlb_cgroup_write;
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/* Add the usage file */
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cft = &h->cgroup_files[1];
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snprintf(cft->name, MAX_CFTYPE_NAME, "%s.usage_in_bytes", buf);
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cft->private = MEMFILE_PRIVATE(idx, RES_USAGE);
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cft->read = hugetlb_cgroup_read;
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/* Add the MAX usage file */
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cft = &h->cgroup_files[2];
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snprintf(cft->name, MAX_CFTYPE_NAME, "%s.max_usage_in_bytes", buf);
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cft->private = MEMFILE_PRIVATE(idx, RES_MAX_USAGE);
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cft->trigger = hugetlb_cgroup_reset;
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cft->read = hugetlb_cgroup_read;
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/* Add the failcntfile */
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cft = &h->cgroup_files[3];
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snprintf(cft->name, MAX_CFTYPE_NAME, "%s.failcnt", buf);
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cft->private = MEMFILE_PRIVATE(idx, RES_FAILCNT);
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cft->trigger = hugetlb_cgroup_reset;
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cft->read = hugetlb_cgroup_read;
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/* NULL terminate the last cft */
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cft = &h->cgroup_files[4];
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memset(cft, 0, sizeof(*cft));
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WARN_ON(cgroup_add_cftypes(&hugetlb_subsys, h->cgroup_files));
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return;
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}
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void __init hugetlb_cgroup_file_init(void)
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{
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struct hstate *h;
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for_each_hstate(h) {
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/*
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* Add cgroup control files only if the huge page consists
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* of more than two normal pages. This is because we use
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* page[2].lru.next for storing cgroup details.
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*/
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if (huge_page_order(h) >= HUGETLB_CGROUP_MIN_ORDER)
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__hugetlb_cgroup_file_init(hstate_index(h));
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}
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}
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/*
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* hugetlb_lock will make sure a parallel cgroup rmdir won't happen
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* when we migrate hugepages
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*/
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void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
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{
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struct hugetlb_cgroup *h_cg;
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struct hstate *h = page_hstate(oldhpage);
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if (hugetlb_cgroup_disabled())
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return;
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VM_BUG_ON(!PageHuge(oldhpage));
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spin_lock(&hugetlb_lock);
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h_cg = hugetlb_cgroup_from_page(oldhpage);
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set_hugetlb_cgroup(oldhpage, NULL);
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/* move the h_cg details to new cgroup */
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set_hugetlb_cgroup(newhpage, h_cg);
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list_move(&newhpage->lru, &h->hugepage_activelist);
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spin_unlock(&hugetlb_lock);
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return;
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}
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struct cgroup_subsys hugetlb_subsys = {
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.name = "hugetlb",
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.css_alloc = hugetlb_cgroup_css_alloc,
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.css_offline = hugetlb_cgroup_css_offline,
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.css_free = hugetlb_cgroup_css_free,
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.subsys_id = hugetlb_subsys_id,
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};
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