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    SubjectRe: oom_killer crash linux system
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    > > page_add_file_rmap() just counts an event where mapcount goes 0->1.
    > > Even if thousands process shares a page, it's just counted into file_mapped as 1.
    > >
    > > Then, there are 480MB of mapped file caches. Do I miss something ?
    > >
    > > Anyway, sum-of-all-lru-of-highmem is 480MB smaller than present pages.
    > > and isolated(anon/file) is 0kB.
    > > (NORMAL has similar problem)
    >
    > hugetlb files? But it's a desktop box. Figo, what's your meminfo?
    >
    > The GEM objects may be files not in LRU, however they should be
    > accounted into shmem.
    >
    > Figo, would you run "page-types -r" for some clues? It can be compiled
    > from the kernel tree:
    >
    > cd linux
    > make Documentation/vm
    > sudo Documentation/vm/page-types -r

    hi fengguang,
    here is the "page-types -r" result:

    flags page-count MB symbolic-flags
    long-symbolic-flags
    0x0000000000000000 16494 64
    __________________________________
    0x0000000100000000 8264 32
    ______________________r___________ reserved
    0x0000000000010000 3010 11
    ________________T_________________ compound_tail
    0x0000000000008000 76 0
    _______________H__________________ compound_head
    0x0000008000000000 1 0
    _____________________________c____ uncached
    0x0000000400000001 1 0
    L_______________________d_________ locked,mappedtodisk
    0x0000000000008014 1 0
    __R_D__________H__________________ referenced,dirty,compound_head
    0x0000000000010014 15 0
    __R_D___________T_________________ referenced,dirty,compound_tail
    0x0000000400000021 235 0
    L____l__________________d_________ locked,lru,mappedtodisk
    0x0000000800000024 64 0
    __R__l___________________P________ referenced,lru,private
    0x0000000400000028 823 3
    ___U_l__________________d_________ uptodate,lru,mappedtodisk
    0x0001000400000028 2 0
    ___U_l__________________d_____I___ uptodate,lru,mappedtodisk,readahead
    0x000000040000002c 1 0
    __RU_l__________________d_________ referenced,uptodate,lru,mappedtodisk
    0x000000000000402c 3837 14
    __RU_l________b___________________ referenced,uptodate,lru,swapbacked
    0x0000000800000030 2 0
    ____Dl___________________P________ dirty,lru,private
    0x0000000800000038 2 0
    ___UDl___________________P________ uptodate,dirty,lru,private
    0x0000000400000038 2 0
    ___UDl__________________d_________ uptodate,dirty,lru,mappedtodisk
    0x000000000000403c 58 0
    __RUDl________b___________________
    referenced,uptodate,dirty,lru,swapbacked
    0x0000000800000060 53 0
    _____lA__________________P________ lru,active,private
    0x0000000800000064 9 0
    __R__lA__________________P________ referenced,lru,active,private
    0x0000000c00000068 8 0
    ___U_lA_________________dP________
    uptodate,lru,active,mappedtodisk,private
    0x0000000000000068 2 0
    ___U_lA___________________________ uptodate,lru,active
    0x000000040000006c 1 0
    __RU_lA_________________d_________
    referenced,uptodate,lru,active,mappedtodisk
    0x0000000800000070 2 0
    ____DlA__________________P________ dirty,lru,active,private
    0x0000000800000074 9 0
    __R_DlA__________________P________ referenced,dirty,lru,active,private
    0x0000000000004078 17910 69
    ___UDlA_______b___________________ uptodate,dirty,lru,active,swapbacked
    0x000000000000407c 5079 19
    __RUDlA_______b___________________
    referenced,uptodate,dirty,lru,active,swapbacked
    0x000000080000007c 1 0
    __RUDlA__________________P________
    referenced,uptodate,dirty,lru,active,private
    0x0004000000008080 70 0
    _______S_______H________________A_ slab,compound_head,slub_frozen
    0x0000000000008080 870 3
    _______S_______H__________________ slab,compound_head
    0x0000000000000080 2505 9
    _______S__________________________ slab
    0x0004000000000080 51 0
    _______S________________________A_ slab,slub_frozen
    0x0000000800000328 1 0
    ___U_l__WI_______________P________
    uptodate,lru,writeback,reclaim,private
    0x0000000000000400 1724 6
    __________B_______________________ buddy
    0x0000000000000800 1 0
    ___________M______________________ mmap
    0x0000000000000804 1 0
    __R________M______________________ referenced,mmap
    0x0000000400000828 101 0
    ___U_l_____M____________d_________ uptodate,lru,mmap,mappedtodisk
    0x000000040000082c 150 0
    __RU_l_____M____________d_________
    referenced,uptodate,lru,mmap,mappedtodisk
    0x0000000000004838 4595 17
    ___UDl_____M__b___________________ uptodate,dirty,lru,mmap,swapbacked
    0x000000000000483c 8 0
    __RUDl_____M__b___________________
    referenced,uptodate,dirty,lru,mmap,swapbacked
    0x0000000400000868 3 0
    ___U_lA____M____________d_________ uptodate,lru,active,mmap,mappedtodisk
    0x000000040000086c 799 3
    __RU_lA____M____________d_________
    referenced,uptodate,lru,active,mmap,mappedtodisk
    0x0000000000004878 576 2
    ___UDlA____M__b___________________
    uptodate,dirty,lru,active,mmap,swapbacked
    0x000000000000487c 73 0
    __RUDlA____M__b___________________
    referenced,uptodate,dirty,lru,active,mmap,swapbacked
    0x0000000000005808 15 0
    ___U_______Ma_b___________________ uptodate,mmap,anonymous,swapbacked
    0x0000000000005828 74342 290
    ___U_l_____Ma_b___________________
    uptodate,lru,mmap,anonymous,swapbacked
    0x000000000000582c 85 0
    __RU_l_____Ma_b___________________
    referenced,uptodate,lru,mmap,anonymous,swapbacked
    0x000000020004582c 12 0
    __RU_l_____Ma_b___u____m__________
    referenced,uptodate,lru,mmap,anonymous,swapbacked,unevictable,mlocked
    0x0000000000005838 2 0
    ___UDl_____Ma_b___________________
    uptodate,dirty,lru,mmap,anonymous,swapbacked
    0x0000000000005868 373077 1457
    ___U_lA____Ma_b___________________
    uptodate,lru,active,mmap,anonymous,swapbacked
    0x000000000000586c 48 0
    __RU_lA____Ma_b___________________
    referenced,uptodate,lru,active,mmap,anonymous,swapbacked
    total 515071 2011




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