The patch titled
Subject: cma: debug: document new debugfs interface
has been added to the -mm tree. Its filename is
cma-debug-document-new-debugfs-interface.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/cma-debug-document-new-debugfs-interface.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/cma-debug-document-new-debugfs-interface.patch
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------------------------------------------------------
From: Sasha Levin <sasha.levin@xxxxxxxxxx>
Subject: cma: debug: document new debugfs interface
Document the structure and files under the new debugfs interface.
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Laura Abbott <lauraa@xxxxxxxxxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/cma/debugfs.txt | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff -puN /dev/null Documentation/cma/debugfs.txt
--- /dev/null
+++ a/Documentation/cma/debugfs.txt
@@ -0,0 +1,21 @@
+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.
_
Patches currently in -mm which might be from sasha.levin@xxxxxxxxxx are
mm-cma-debugfs-interface.patch
mm-cma-allocation-trigger.patch
mm-cma-release-trigger.patch
mm-cma-release-trigger-checkpatch-fixes.patch
mm-cma-release-trigger-fixpatch.patch
mm-cma-allocation-trigger-fix.patch
cma-debug-document-new-debugfs-interface.patch
mm-incorporate-zero-pages-into-transparent-huge-pages.patch
mm-incorporate-zero-pages-into-transparent-huge-pages-fix.patch
linux-next.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
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