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| author |   Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2017-11-15 17:35:33 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-15 18:21:04 -0800 |
| commit | b4e98d9ac775907cc53fb08fcb6776deb7694e30 (patch) | |
| tree | 4a82caff5eab86a66f078622acfd68df5ac92235 /include/linux/mm_types.h | |
| parent | kmemleak: change /sys/kernel/debug/kmemleak permissions from 0444 to 0644 (diff) | |
| download | linux-dev-b4e98d9ac775907cc53fb08fcb6776deb7694e30.tar.xz linux-dev-b4e98d9ac775907cc53fb08fcb6776deb7694e30.zip | |
mm: account pud page tables
On a machine with 5-level paging support a process can allocate
significant amount of memory and stay unnoticed by oom-killer and memory
cgroup. The trick is to allocate a lot of PUD page tables. We don't
account PUD page tables, only PMD and PTE.
We already addressed the same issue for PMD page tables, see commit
dc6c9a35b66b ("mm: account pmd page tables to the process").
Introduction of 5-level paging brings the same issue for PUD page
tables.
The patch expands accounting to PUD level.
[kirill.shutemov@linux.intel.com: s/pmd_t/pud_t/]
Link: http://lkml.kernel.org/r/20171004074305.x35eh5u7ybbt5kar@black.fi.intel.com
[heiko.carstens@de.ibm.com: s390/mm: fix pud table accounting]
Link: http://lkml.kernel.org/r/20171103090551.18231-1-heiko.carstens@de.ibm.com
Link: http://lkml.kernel.org/r/20171002080427.3320-1-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mm_types.h')
| -rw-r--r-- | include/linux/mm_types.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index d1b8e8f97fc2..e9e561e02d22 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -405,6 +405,9 @@ struct mm_struct { #if CONFIG_PGTABLE_LEVELS > 2 atomic_long_t nr_pmds; /* PMD page table pages */ #endif +#if CONFIG_PGTABLE_LEVELS > 3 + atomic_long_t nr_puds; /* PUD page table pages */ +#endif int map_count; /* number of VMAs */ spinlock_t page_table_lock; /* Protects page tables and some counters */ |