![Aneesh Kumar K.V](/assets/img/avatar_default.png)
Add the charge and uncharge routines for hugetlb cgroup. We do cgroup charging in page alloc and uncharge in compound page destructor. Assigning page's hugetlb cgroup is protected by hugetlb_lock. [liwp@linux.vnet.ibm.com: add huge_page_order check to avoid incorrect uncharge] Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: David Rientjes <rientjes@google.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hillf Danton <dhillf@gmail.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Wanpeng Li <liwp.linux@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
201 lines
4.9 KiB
C
201 lines
4.9 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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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 container_of(s, struct hugetlb_cgroup, css);
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}
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static inline
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struct hugetlb_cgroup *hugetlb_cgroup_from_cgroup(struct cgroup *cgroup)
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{
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return hugetlb_cgroup_from_css(cgroup_subsys_state(cgroup,
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hugetlb_subsys_id));
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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_subsys_state(task,
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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 *parent_hugetlb_cgroup(struct cgroup *cg)
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{
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if (!cg->parent)
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return NULL;
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return hugetlb_cgroup_from_cgroup(cg->parent);
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}
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static inline bool hugetlb_cgroup_have_usage(struct cgroup *cg)
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{
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int idx;
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struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_cgroup(cg);
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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 *hugetlb_cgroup_create(struct cgroup *cgroup)
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{
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int idx;
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struct cgroup *parent_cgroup;
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struct hugetlb_cgroup *h_cgroup, *parent_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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parent_cgroup = cgroup->parent;
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if (parent_cgroup) {
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parent_h_cgroup = hugetlb_cgroup_from_cgroup(parent_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_destroy(struct cgroup *cgroup)
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{
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struct hugetlb_cgroup *h_cgroup;
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h_cgroup = hugetlb_cgroup_from_cgroup(cgroup);
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kfree(h_cgroup);
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}
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static int hugetlb_cgroup_pre_destroy(struct cgroup *cgroup)
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{
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/* We will add the cgroup removal support in later patches */
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return -EBUSY;
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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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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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spin_lock(&hugetlb_lock);
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set_hugetlb_cgroup(page, h_cg);
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spin_unlock(&hugetlb_lock);
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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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struct cgroup_subsys hugetlb_subsys = {
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.name = "hugetlb",
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.create = hugetlb_cgroup_create,
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.pre_destroy = hugetlb_cgroup_pre_destroy,
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.destroy = hugetlb_cgroup_destroy,
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.subsys_id = hugetlb_subsys_id,
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};
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