d62a849ab43430326c33d3e004a42e9b34080731 |
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24-Apr-2017 |
SzuWei Lin <szuweilin@google.com> |
libufdt: reduce the number of malloc/free calling 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
/system/libufdt/include/libufdt.h
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e78aa56232a888c30b5de559797578eac6bc1663 |
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17-Apr-2017 |
SzuWei Lin <szuweilin@google.com> |
Correct code placement for different license 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
/system/libufdt/include/libufdt.h
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8a7039c218527bfc25a2831f480a9558e64f84e5 |
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14-Apr-2017 |
SzuWei Lin <szuweilin@google.com> |
Code revise - 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
/system/libufdt/include/libufdt.h
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6ad4caae73191bdc2403185b6482969c17604c95 |
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06-Apr-2017 |
SzuWei Lin <szuweilin@google.com> |
Add Apache2 module license Bug: 36678371 Test: mmm system/libufdt, and success build Change-Id: I73059f5beca2242f8883fca86cb49d53d0f543b8
/system/libufdt/include/libufdt.h
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1be68ae53e645de1b2ec26140b302fbfcbbb919f |
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30-Mar-2017 |
SzuWei Lin <szuweilin@google.com> |
Avoid to re-generate string table from ufdt to fdt 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
/system/libufdt/include/libufdt.h
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f6c209b3f409f879305ac9837524b9d34c850de6 |
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27-Nov-2016 |
Li Chen <akaineko@google.com> |
libufdt: device tree overlay via unflattening FDT 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
/system/libufdt/include/libufdt.h
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eeaff8f66f44518a0e776957c6e0921f7799ace2 |
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14-Dec-2016 |
Jeff Hao <jeffhao@google.com> |
Revert "libufdt: device tree overlay via unflattening FDT" This reverts commit 3084ce7cbdff84093286459758f99c15082e6556. Change-Id: I36f8252ea77c75301711009180c1908bb18e231c
/system/libufdt/include/libufdt.h
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3084ce7cbdff84093286459758f99c15082e6556 |
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27-Nov-2016 |
LiChen <akaineko@google.com> |
libufdt: device tree overlay via unflattening FDT 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
/system/libufdt/include/libufdt.h
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