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Revise the recursive function calls to be a loop in function
ufdt_node_destruct(), to reduce the call stack memory usage.
Bug: 62473375
Test: tests/run_tests.sh
Change-Id: Ifec5d655407aded115115be7d8196bfad97623d9
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The performance of some bootloader malloc/free implementation isn't
optimized, but libufdt calls huge number of malloc/free to build a
real tree data structure.
The patch adds an ufdt_node_pool to reduce the number of malloc/free.
ufdt_node_pool asks a larger memory block in each time, and
distributes the memory into several ufdt_node (ufdt_node_fdt_prop
or ufdt_node_fdt_node). libufdt doesn't need to call malloc()
to allocate memory until out of larger memory block.
The setting of this patch is 1024 nodes in each memory block,
so it can reduce ~1023/1024 malloc/free calling times after the patch
is applied.
Bug: 32969430
Test: ./tests/run_tests.sh
Test: ./tests/run_performance_test.sh
Change-Id: Id95e74da1235b9e2fc306500686515ee6b93017d
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Previous code revising moved some code into a file with different license.
Fix it in this patch.
Test: ./tests/run_tests.sh
Change-Id: Ie50000bba7a6bf8d9d65dcc1a1cf21135ac3b97a
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- Remove unused code
- Remove internel functions from header file
- Fix typos
- Revise all function names with prefix ufdt_*
Test: ./tests/run_tests.sh
Change-Id: I4f89e90eb983540e78aadb092c07de62d219e454
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Bug: 36678371
Test: mmm system/libufdt, and success build
Change-Id: I73059f5beca2242f8883fca86cb49d53d0f543b8
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String table contains the strings of all property name in a fdt.
The ufdt_apply_overlay() converts two dtbs from fdt to ufdt,
overlays, and converts merged ufdt to fdt. These operations
shouldn't create new peroperty names, so we can just re-use the
string tables in original dtbs, and just copy them into merged
fdt. This solution can enhance a lot of performance for device
tree overlaying.
To avoid the error that some users could use string offset in
string table, the solution also give a same string offset for
the name properties by ufdt_prop_dict;
Futher, the patch also removed unused header files after
changing algorithm.
Bug: 35255584
Test: ./tests/run_tests.sh
Change-Id: Id422730115531bd20d21117285291bdd860915ff
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libufdt could reversed the node order during overlaying.
However, the libfdt overlay in dtc doesn't promise the node order.
But looks there are some implementation of kernel drivers depend on
the order in DTS.
The patch keeps the DTB/DTBO node order during libufdt overlaying.
Notes that the node order merged by libufdt could not match the
result of libfdt.
Bug: 35429321
Test: run test scripts (see libufdt/tests/README)
Change-Id: I7209ebfaa21d6640d547b029ea0f0edf6e58fca1
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The original version of libdtoverlay is slow in searching for
particular nodes and adding subnodes/properties due to the operations
on flattened device tree (FDT).
`libufdt` builds a real tree structure (named ufdt -- unflattned
device tree) from FDT. In the real tree, we can perform certain
operations (e.g., merge 2 subtrees, search for a node by path) in
almost optimal time complexity with acceptable additional memory usage.
With libufdt, we improve the merging of two dtb files from O(N^2) to
O(N), where N is the number of nodes in the tree.
Bug: 30800619
Test: run test scripts (see libufdt/tests/README)
Test: manually ported libufdt into a bootloader,
checked it can merge a base dtb and a dtbo to generate a final dtb
to boot the device
Change-Id: I1ff886bb8a62bad1451edcd7c4fe5cb48b7a034a
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This reverts commit 3084ce7cbdff84093286459758f99c15082e6556.
Change-Id: I36f8252ea77c75301711009180c1908bb18e231c
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The original version of libdtoverlay is slow in searching for
particular nodes and adding subnodes/properties due to the operations
on flattened device tree (FDT).
`libufdt` builds a real tree structure (named ufdt -- unflattned
device tree) from FDT. In the real tree, we can perform certain
operations (e.g., merge 2 subtrees, search for a node by path) in
almost optimal time complexity with acceptable additional memory usage.
With libufdt, we improve the merging of two dtb files from O(N^2) to
O(N), where N is the number of nodes in the tree.
Bug: 30800619
Test: run test scripts (see libufdt/tests/README)
Test: manually ported libufdt into a bootloader,
checked it can merge a base dtb and a dtbo to generate a final dtb
to boot the device
Change-Id: I6a282cc99129d5280ecbf40852723f83735fa523
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