btf: mmap vmlinux if possible #1812
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florianl
reviewed
Jun 24, 2025
Parsing BTF still relies on io.Reader(At) in places, which makes it awkward to parse from a plain byte slice. Rework the internal plumbing to use []byte. This also deductes the endianness of a BTF blob from its header, which allows us to get rid of guessBTFByteOrder. Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
The kernel recently gained the ability to mmap vmlinux BTF, which allows us to not allocate a couple megabytes of heap memory. See torvalds/linux@a539e2a Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
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See commit messages. Merge once 6.15 is released.