/proc/buddyinfo

/proc/buddyinfo This file is used primarily for diagnosing memory fragmentation issues. Using The buddy algorithm, each column represents the number of pages of a certain order (a certain size) that are Availab Le at no given time. For example, for zone DMA (direct memory access), there are of 2^ (0*page_size) chunks of memory. Similarly, there are 6 of 2^ (1*page_size) chunks, and 2 of 2^ (2*page_size) chunks of memory available. The DMA row references the A system, the Highmem row references all memory greater than 4 GB on a system, a nd the Normal row references all memory in between. The following is an example of the output typical of/proc/buddyinfo:

Node 0, Zone      DMA      6      2      1      1      ...
Node 0, Zone   Normal   1650    310      5      0      0      ...
Node 0, Zone  highmem      2      0      0      1      1      ...