Re: oom_killer crash linux system

From: Figo.zhang
Date: Tue Oct 19 2010 - 22:11:14 EST


> > 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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