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Subject: docs: cma/debugfs.txt: convert docs to ReST and rename to *.rst Author: Mauro Carvalho Chehab <[email protected]> Date: Sun Apr 14 08:37:58 2019 -0300 The debugfs interface for CMA should be there together with other mm-related documents. Convert this small file to ReST and move it to its rightful place. The conversion is actually quite simple: just add a title for the document. In order to make it to look better for the audience, also mark the "echo" command as a literal block. While this is not part of any book, mark it as :orphan:, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab <[email protected]> Documentation/cma/debugfs.rst | 27 +++++++++++++++++++++++++++ Documentation/cma/debugfs.txt | 21 --------------------- 2 files changed, 27 insertions(+), 21 deletions(-) --- diff --git a/Documentation/cma/debugfs.rst b/Documentation/cma/debugfs.rst new file mode 100644 index 000000000000..518fe401b5ee --- /dev/null +++ b/Documentation/cma/debugfs.rst @@ -0,0 +1,27 @@ +: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. diff --git a/Documentation/cma/debugfs.txt b/Documentation/cma/debugfs.txt deleted file mode 100644 index 6cef20a8cedc..000000000000 --- a/Documentation/cma/debugfs.txt +++ /dev/null @@ -1,21 +0,0 @@ -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. _______________________________________________ linuxtv-commits mailing list [email protected] https://www.linuxtv.org/cgi-bin/mailman/listinfo/linuxtv-commits
