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hugetlb/cgroup: add support for cgroup removal 

Add support for cgroup removal.  If we don't have parent cgroup, the
charges are moved to root cgroup.

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>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.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 16:42:21 -07:00 committed by Linus Torvalds
parent 6d76dcf404
commit da1def5591
1 changed files with 68 additions and 2 deletions
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70
mm/hugetlb_cgroup.c
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@ -105,10 +105,76 @@ static void hugetlb_cgroup_destroy(struct cgroup *cgroup)
kfree(h_cgroup);
}
/*
* Should be called with hugetlb_lock held.
* Since we are holding hugetlb_lock, pages cannot get moved from
* active list or uncharged from the cgroup, So no need to get
* page reference and test for page active here. This function
* cannot fail.
*/
static void hugetlb_cgroup_move_parent(int idx, struct cgroup *cgroup,
struct page *page)
{
int csize;
struct res_counter *counter;
struct res_counter *fail_res;
struct hugetlb_cgroup *page_hcg;
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_cgroup(cgroup);
struct hugetlb_cgroup *parent = parent_hugetlb_cgroup(cgroup);
page_hcg = hugetlb_cgroup_from_page(page);
/*
* We can have pages in active list without any cgroup
* ie, hugepage with less than 3 pages. We can safely
* ignore those pages.
*/
if (!page_hcg || page_hcg != h_cg)
goto out;
csize = PAGE_SIZE << compound_order(page);
if (!parent) {
parent = root_h_cgroup;
/* root has no limit */
res_counter_charge_nofail(&parent->hugepage[idx],
csize, &fail_res);
}
counter = &h_cg->hugepage[idx];
res_counter_uncharge_until(counter, counter->parent, csize);
set_hugetlb_cgroup(page, parent);
out:
return;
}
/*
* Force the hugetlb cgroup to empty the hugetlb resources by moving them to
* the parent cgroup.
*/
static int hugetlb_cgroup_pre_destroy(struct cgroup *cgroup)
{
/* We will add the cgroup removal support in later patches */
return -EBUSY;
struct hstate *h;
struct page *page;
int ret = 0, idx = 0;
do {
if (cgroup_task_count(cgroup) ||
!list_empty(&cgroup->children)) {
ret = -EBUSY;
goto out;
}
for_each_hstate(h) {
spin_lock(&hugetlb_lock);
list_for_each_entry(page, &h->hugepage_activelist, lru)
hugetlb_cgroup_move_parent(idx, cgroup, page);
spin_unlock(&hugetlb_lock);
idx++;
}
cond_resched();
} while (hugetlb_cgroup_have_usage(cgroup));
out:
return ret;
}
int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,