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Diffstat (limited to 'Documentation/cma')
| -rw-r--r-- | Documentation/cma/debugfs.rst | 27 |
1 files changed, 0 insertions, 27 deletions
diff --git a/Documentation/cma/debugfs.rst b/Documentation/cma/debugfs.rst deleted file mode 100644 index 518fe401b5ee..000000000000 --- a/Documentation/cma/debugfs.rst +++ /dev/null @@ -1,27 +0,0 @@ -:orphan: - -===================== -CMA Debugfs Interface -===================== - -The CMA debugfs interface is useful to retrieve basic information out of the -different CMA areas and to test allocation/release in each of the areas. - -Each CMA zone represents a directory under <debugfs>/cma/, indexed by the -kernel's CMA index. So the first CMA zone would be: - - <debugfs>/cma/cma-0 - -The structure of the files created under that directory is as follows: - - - [RO] base_pfn: The base PFN (Page Frame Number) of the zone. - - [RO] count: Amount of memory in the CMA area. - - [RO] order_per_bit: Order of pages represented by one bit. - - [RO] bitmap: The bitmap of page states in the zone. - - [WO] alloc: Allocate N pages from that CMA area. For example:: - - echo 5 > <debugfs>/cma/cma-2/alloc - -would try to allocate 5 pages from the cma-2 area. - - - [WO] free: Free N pages from that CMA area, similar to the above. |