查看“︁linux内存状态”︁的源代码

<pre>
F:\t\a\0928> adb shell cat /proc/buddyinfo
Node 0, zone   Normal   5117    255      6      0      0      0      0      0      0      0      0
Node 0, zone  HighMem    282     89      9      0      0      0      0      0      0      0      0

F:\t\a\0928> adb shell cat /proc/pagetypeinfo
Page block order: 10
Pages per block:  1024

Free pages count per migrate type at order       0      1      2      3      4      5      6      7      8      9     10
Node    0, zone   Normal, type    Unmovable   1936      9      0      0      0      0      0      0      0      0      0
Node    0, zone   Normal, type  Reclaimable   2526     12      0      0      0      0      0      0      0      0      0
Node    0, zone   Normal, type      Movable    655    234      6      0      0      0      0      0      0      0      0
Node    0, zone   Normal, type      Reserve      0      0      0      0      0      0      0      0      0      0      0
Node    0, zone   Normal, type      Isolate      0      0      0      0      0      0      0      0      0      0      0
Node    0, zone  HighMem, type    Unmovable    130      2      0      0      0      0      0      0      0      0      0
Node    0, zone  HighMem, type  Reclaimable      0      0      0      0      0      0      0      0      0      0      0
Node    0, zone  HighMem, type      Movable    152     87      9      0      0      0      0      0      0      0      0
Node    0, zone  HighMem, type      Reserve      0      0      0      0      0      0      0      0      0      0      0
Node    0, zone  HighMem, 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   Normal           31           13           84            0            0
Node 0, zone  HighMem           19            0          101            0            0

F:\t\a\0928> adb shell cat /proc/buddyinfo
Node 0, zone   Normal   5117    255      6      0      0      0      0      0      0      0      0
Node 0, zone  HighMem    282     89      9      0      0      0      0      0      0      0      0
</pre>

*pagetypeinfo

:pagetypeinfo中，前两行是打印当前系统中 block的阶数和大小，这里为10阶，大小为2^10=1024个Page

:接下来是打印当前各个内存结点（Node）、内存域（zone）、内存类型(type)中各阶空闲内存的个数，如Normal Movable 2阶内存可用个数为6

:最后打印的也是当前系统各类内存的block个数（总个数?，含使用中的和空闲的?）

*buddyinfo

:buddyinfo与pagetypeinfo类似，也是打印当前可用内存的个数，不同的是只对内存域进行了区分，看不到type信息，将pagetypeinfo中各type个数相加，就可以得到buddyinfo中的数据

:其实buddyinfo比pagetypeinfo的历史要久得多，pagetypeinfo是随着反碎片技术而引入的，而buddyinfo则是用于打印伙伴系统内存信息的