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Date: Tue, 5 Apr 2016 18:25:13 -0700 (PDT) From: David Rientjes <rientjes@...gle.com> To: Andrew Morton <akpm@...ux-foundation.org> cc: Michal Hocko <mhocko@...e.com>, Johannes Weiner <hannes@...xchg.org>, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, linux-kernel@...r.kernel.org, linux-mm@...ck.org Subject: [patch] mm, hugetlb_cgroup: round limit_in_bytes down to hugepage size The page_counter rounds limits down to page size values. This makes sense, except in the case of hugetlb_cgroup where it's not possible to charge partial hugepages. Round the hugetlb_cgroup limit down to hugepage size. Signed-off-by: David Rientjes <rientjes@...gle.com> --- mm/hugetlb_cgroup.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c --- a/mm/hugetlb_cgroup.c +++ b/mm/hugetlb_cgroup.c @@ -288,6 +288,7 @@ static ssize_t hugetlb_cgroup_write(struct kernfs_open_file *of, switch (MEMFILE_ATTR(of_cft(of)->private)) { case RES_LIMIT: + nr_pages &= ~((1 << huge_page_order(&hstates[idx])) - 1); mutex_lock(&hugetlb_limit_mutex); ret = page_counter_limit(&h_cg->hugepage[idx], nr_pages); mutex_unlock(&hugetlb_limit_mutex);
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