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hugetlb/cgroup: assign the page hugetlb cgroup when we move the page to active list.

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A page's hugetlb cgroup assignment and movement to the active list should
occur with hugetlb_lock held.  Otherwise when we remove the hugetlb cgroup
we will iterate the active list and find pages with NULL hugetlb cgroup
values.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
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 16:42:35 -07:00
committed by Linus Torvalds
parent 79dbb2368a
commit 94ae8ba717
2 changed files with 13 additions and 14 deletions
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5
mm/hugetlb_cgroup.c
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@@ -213,6 +213,7 @@ done:
return ret;
}
/* Should be called with hugetlb_lock held */
void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg,
struct page *page)
@@ -220,9 +221,7 @@ void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
if (hugetlb_cgroup_disabled() || !h_cg)
return;
spin_lock(&hugetlb_lock);
set_hugetlb_cgroup(page, h_cg);
spin_unlock(&hugetlb_lock);
return;
}
@@ -389,6 +388,7 @@ int __init hugetlb_cgroup_file_init(int idx)
void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
{
struct hugetlb_cgroup *h_cg;
struct hstate *h = page_hstate(oldhpage);
if (hugetlb_cgroup_disabled())
return;
@@ -401,6 +401,7 @@ void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
/* move the h_cg details to new cgroup */
set_hugetlb_cgroup(newhpage, h_cg);
list_move(&newhpage->lru, &h->hugepage_activelist);
spin_unlock(&hugetlb_lock);
cgroup_release_and_wakeup_rmdir(&h_cg->css);
return;