/proc/pagetypeinfo ? what is this data ?

Kushal Gowda

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May 11, 2016, 1:30:24 AM5/11/16

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HI,

Any Idea as to what this "Page block order" is in the output of /proc/pagetypeinfo ?

> cat /proc/pagetypeinfo
Page block order: 9
Pages per block:  512

Free pages count per migrate type at order       0      1      2      3      4      5      6      7      8      9     10
Node    0, zone      DMA, type    Unmovable      0      0      0      1      1      1      1      1      1      1      0
Node    0, zone      DMA, type  Reclaimable      0      0      0      0      0      0      0      0      0      0      0
Node    0, zone      DMA, type      Movable      1      1      2      1      2      1      1      0      1      0      2
Node    0, zone      DMA, type      Reserve      0      0      0      0      0      0      0      0      0      1      0
Node    0, zone      DMA, type      Isolate      0      0      0      0      0      0      0      0      0      0      0
Node    0, zone    DMA32, type    Unmovable    103     54     77      1      1      1     11      8      7      1      9
Node    0, zone    DMA32, type  Reclaimable      0      0      2      1      0      0      0      0      1      0      0
Node    0, zone    DMA32, type      Movable    169    152    113     91     77     54     39     13      6      1    452
Node    0, zone    DMA32, type      Reserve      1      2      2      2      2      0      1      1      1      1      0
Node    0, zone    DMA32, type      Isolate      0      0      0      0      0      0      0      0      0      0      0

Number of blocks type     Unmovable  Reclaimable      Movable      Reserve      Isolate
Node 0, zone      DMA            2            0            5            1            0
Node 0, zone    DMA32           41            6          967            2            0

Any sources to understand this ? Man proc is not helping much.  I understand what this Movable, Unmovable, stuffs are all about... But what is the whole idea this output is giving ?

Thanking any responses,

Kushal Gowda

Anil Kumar Pugalia

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May 12, 2016, 1:27:20 AM5/12/16

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It is log base 2 of (Pages per block), i.e. 2^9 = 512.

Regards
Anil

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Kushal Gowda

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May 15, 2016, 6:54:41 AM5/15/16

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Thank you sir.

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