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/*
*
* Copyright IBM Corporation, 2012
* Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2.1 of the GNU Lesser General Public License
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
*/
#include <linux/cgroup.h>
#include <linux/slab.h>
#include <linux/hugetlb.h>
#include <linux/hugetlb_cgroup.h>
struct hugetlb_cgroup {
struct cgroup_subsys_state css;
/*
* the counter to account for hugepages from hugetlb.
*/
struct res_counter hugepage[HUGE_MAX_HSTATE];
};
struct cgroup_subsys hugetlb_subsys __read_mostly;
static struct hugetlb_cgroup *root_h_cgroup __read_mostly;
static inline
struct hugetlb_cgroup *hugetlb_cgroup_from_css(struct cgroup_subsys_state *s)
{
return container_of(s, struct hugetlb_cgroup, css);
}
static inline
struct hugetlb_cgroup *hugetlb_cgroup_from_cgroup(struct cgroup *cgroup)
{
return hugetlb_cgroup_from_css(cgroup_subsys_state(cgroup,
hugetlb_subsys_id));
}
static inline
struct hugetlb_cgroup *hugetlb_cgroup_from_task(struct task_struct *task)
{
return hugetlb_cgroup_from_css(task_subsys_state(task,
hugetlb_subsys_id));
}
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)
{
if (!cg->parent)
return NULL;
return hugetlb_cgroup_from_cgroup(cg->parent);
}
static inline bool hugetlb_cgroup_have_usage(struct cgroup *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)
return true;
}
return false;
}
static struct cgroup_subsys_state *hugetlb_cgroup_create(struct cgroup *cgroup)
{
int idx;
struct cgroup *parent_cgroup;
struct hugetlb_cgroup *h_cgroup, *parent_h_cgroup;
h_cgroup = kzalloc(sizeof(*h_cgroup), GFP_KERNEL);
if (!h_cgroup)
return ERR_PTR(-ENOMEM);
parent_cgroup = cgroup->parent;
if (parent_cgroup) {
parent_h_cgroup = hugetlb_cgroup_from_cgroup(parent_cgroup);
for (idx = 0; idx < HUGE_MAX_HSTATE; idx++)
res_counter_init(&h_cgroup->hugepage[idx],
&parent_h_cgroup->hugepage[idx]);
} else {
root_h_cgroup = h_cgroup;
for (idx = 0; idx < HUGE_MAX_HSTATE; idx++)
res_counter_init(&h_cgroup->hugepage[idx], NULL);
}
return &h_cgroup->css;
}
static void hugetlb_cgroup_destroy(struct cgroup *cgroup)
{
struct hugetlb_cgroup *h_cgroup;
h_cgroup = hugetlb_cgroup_from_cgroup(cgroup);
kfree(h_cgroup);
}
static int hugetlb_cgroup_pre_destroy(struct cgroup *cgroup)
{
/* We will add the cgroup removal support in later patches */
return -EBUSY;
}
int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
struct hugetlb_cgroup **ptr)
{
int ret = 0;
struct res_counter *fail_res;
struct hugetlb_cgroup *h_cg = NULL;
unsigned long csize = nr_pages * PAGE_SIZE;
if (hugetlb_cgroup_disabled())
goto done;
/*
* We don't charge any cgroup if the compound page have less
* than 3 pages.
*/
if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER)
goto done;
again:
rcu_read_lock();
h_cg = hugetlb_cgroup_from_task(current);
if (!css_tryget(&h_cg->css)) {
rcu_read_unlock();
goto again;
}
rcu_read_unlock();
ret = res_counter_charge(&h_cg->hugepage[idx], csize, &fail_res);
css_put(&h_cg->css);
done:
*ptr = h_cg;
return ret;
}
void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg,
struct page *page)
{
if (hugetlb_cgroup_disabled() || !h_cg)
return;
spin_lock(&hugetlb_lock);
set_hugetlb_cgroup(page, h_cg);
spin_unlock(&hugetlb_lock);
return;
}
/*
* Should be called with hugetlb_lock held
*/
void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
struct page *page)
{
struct hugetlb_cgroup *h_cg;
unsigned long csize = nr_pages * PAGE_SIZE;
if (hugetlb_cgroup_disabled())
return;
VM_BUG_ON(!spin_is_locked(&hugetlb_lock));
h_cg = hugetlb_cgroup_from_page(page);
if (unlikely(!h_cg))
return;
set_hugetlb_cgroup(page, NULL);
res_counter_uncharge(&h_cg->hugepage[idx], csize);
return;
}
void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg)
{
unsigned long csize = nr_pages * PAGE_SIZE;
if (hugetlb_cgroup_disabled() || !h_cg)
return;
if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER)
return;
res_counter_uncharge(&h_cg->hugepage[idx], csize);
return;
}
struct cgroup_subsys hugetlb_subsys = {
.name = "hugetlb",
.create = hugetlb_cgroup_create,
.pre_destroy = hugetlb_cgroup_pre_destroy,
.destroy = hugetlb_cgroup_destroy,
.subsys_id = hugetlb_subsys_id,
};
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