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hugetlb/cgroup: add charge/uncharge routines for hugetlb cgroup

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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>
This commit is contained in:
Aneesh Kumar K.V 2012-07-31 16:42:18 -07:00 committed by Linus Torvalds
parent 9dd540e231
commit 6d76dcf404
3 changed files with 133 additions and 1 deletions
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38
include/linux/hugetlb_cgroup.h
View File

@ -53,6 +53,16 @@ static inline bool hugetlb_cgroup_disabled(void)
return false;
}
extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
struct hugetlb_cgroup **ptr);
extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg,
struct page *page);
extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
struct page *page);
extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg);
#else
static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
{
@ -70,5 +80,33 @@ static inline bool hugetlb_cgroup_disabled(void)
return true;
}
static inline int
hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
struct hugetlb_cgroup **ptr)
{
return 0;
}
static inline void
hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg,
struct page *page)
{
return;
}
static inline void
hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page)
{
return;
}
static inline void
hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg)
{
return;
}
#endif /* CONFIG_MEM_RES_CTLR_HUGETLB */
#endif

16
mm/hugetlb.c
View File

@ -627,6 +627,8 @@ static void free_huge_page(struct page *page)
BUG_ON(page_mapcount(page));
spin_lock(&hugetlb_lock);
hugetlb_cgroup_uncharge_page(hstate_index(h),
pages_per_huge_page(h), page);
if (h->surplus_huge_pages_node[nid] && huge_page_order(h) < MAX_ORDER) {
/* remove the page from active list */
list_del(&page->lru);
@ -1115,7 +1117,10 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
struct hstate *h = hstate_vma(vma);
struct page *page;
long chg;
int ret, idx;
struct hugetlb_cgroup *h_cg;
idx = hstate_index(h);
/*
* Processes that did not create the mapping will have no
* reserves and will not have accounted against subpool
@ -1131,6 +1136,11 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
if (hugepage_subpool_get_pages(spool, chg))
return ERR_PTR(-ENOSPC);
ret = hugetlb_cgroup_charge_cgroup(idx, pages_per_huge_page(h), &h_cg);
if (ret) {
hugepage_subpool_put_pages(spool, chg);
return ERR_PTR(-ENOSPC);
}
spin_lock(&hugetlb_lock);
page = dequeue_huge_page_vma(h, vma, addr, avoid_reserve);
spin_unlock(&hugetlb_lock);
@ -1138,6 +1148,9 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
if (!page) {
page = alloc_buddy_huge_page(h, NUMA_NO_NODE);
if (!page) {
hugetlb_cgroup_uncharge_cgroup(idx,
pages_per_huge_page(h),
h_cg);
hugepage_subpool_put_pages(spool, chg);
return ERR_PTR(-ENOSPC);
}
@ -1146,7 +1159,8 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
set_page_private(page, (unsigned long)spool);
vma_commit_reservation(h, vma, addr);
/* update page cgroup details */
hugetlb_cgroup_commit_charge(idx, pages_per_huge_page(h), h_cg, page);
return page;
}

80
mm/hugetlb_cgroup.c
View File

@ -111,6 +111,86 @@ static int hugetlb_cgroup_pre_destroy(struct cgroup *cgroup)
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,