Commits on Jan 18, 2024

1. bpftool: add support for split BTF to gen min_core_btf …

   Enables a user to generate minimized kernel module BTF.
   
   If an eBPF program probes a function within a kernel module or uses
   types that come from a kernel module, split BTF is required. The split
   module BTF contains only the BTF types that are unique to the module.
   It will reference the base/vmlinux BTF types and always starts its type
   IDs at X+1 where X is the largest type ID in the base BTF.
   
   Minimization allows a user to ship only the types necessary to do
   relocations for the program(s) in the provided eBPF object file(s). A
   minimized module BTF will still not contain vmlinux BTF types, so you
   should always minimize the vmlinux file first, and then minimize the
   kernel module file.
   
   Example:
   
   bpftool gen min_core_btf vmlinux.btf vm-min.btf prog.bpf.o
   bpftool -B vm-min.btf gen min_core_btf mod.btf mod-min.btf prog.bpf.o
   
   Signed-off-by: Bryce Kahle <[email protected]>

   

   brycekahle committed Jan 18, 2024
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