linux-kernel - [PATCH 0/2] Account PMD page tables to the process

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Date:	Tue, 13 Jan 2015 21:14:14 +0200
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>
Cc:	linux-mm@...ck.org, Dave Hansen <dave.hansen@...ux.intel.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Pavel Emelyanov <xemul@...nvz.org>,
	linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 0/2] Account PMD page tables to the process

Currently we don't account PMD page tables to the process. It can lead to
local DoS: unprivileged user can allocate >500 MiB on x86_64 per process
without being noticed by oom-killer or memory cgroup.

Proposed fix adds accounting for PMD table the same way we account for PTE
tables.

There're few corner case in the accounting (see patch 2/2) which have not
well tested yet. If anybody know any other cases we should handle, please
let me know.

Kirill A. Shutemov (2):
  mm: rename mm->nr_ptes to mm->nr_pgtables
  mm: account pmd page tables to the process

 Documentation/sysctl/vm.txt |  2 +-
 arch/x86/mm/pgtable.c       | 13 ++++++++-----
 fs/proc/task_mmu.c          |  2 +-
 include/linux/mm_types.h    |  2 +-
 kernel/fork.c               |  2 +-
 mm/debug.c                  |  4 ++--
 mm/huge_memory.c            | 10 +++++-----
 mm/hugetlb.c                |  8 ++++++--
 mm/memory.c                 |  6 ++++--
 mm/mmap.c                   |  9 +++++++--
 mm/oom_kill.c               |  8 ++++----
 11 files changed, 40 insertions(+), 26 deletions(-)

-- 
2.1.4

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