linux-kernel - [patch] mm, hugetlb_cgroup: round limit_in

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Message-ID: <alpine.DEB.2.10.1604051824320.32718@chino.kir.corp.google.com>
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);