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authorDaniel Borkmann <daniel@iogearbox.net>2019-02-05 16:52:58 +0100
committerDaniel Borkmann <daniel@iogearbox.net>2019-02-05 16:52:58 +0100
commit31de389707c8842ce71eaa8eff1eb74a43d5ef30 (patch)
treefe630450860cda33ac53bae54ad2bcb3247b6c9a /arch
parentlibbpf: fix libbpf_print (diff)
parentselftests/btf: add initial BTF dedup tests (diff)
downloadlinux-31de389707c8842ce71eaa8eff1eb74a43d5ef30.tar.xz
linux-31de389707c8842ce71eaa8eff1eb74a43d5ef30.zip
Merge branch 'bpf-btf-dedup'
Andrii Nakryiko says: ==================== This patch series adds BTF deduplication algorithm to libbpf. This algorithm allows to take BTF type information containing duplicate per-compilation unit information and reduce it to equivalent set of BTF types with no duplication without loss of information. It also deduplicates strings and removes those strings that are not referenced from any BTF type (and line information in .BTF.ext section, if any). Algorithm also resolves struct/union forward declarations into concrete BTF types across multiple compilation units to facilitate better deduplication ratio. If undesired, this resolution can be disabled through specifying corresponding options. When applied to BTF data emitted by pahole's DWARF->BTF converter, it reduces the overall size of .BTF section by about 65x, from about 112MB to 1.75MB, leaving only 29247 out of initial 3073497 BTF type descriptors. Algorithm with minor differences and preliminary results before FUNC/FUNC_PROTO support is also described more verbosely at: https://facebookmicrosites.github.io/bpf/blog/2018/11/14/btf-enhancement.html v1->v2: - rebase on latest bpf-next - err_log/elog -> pr_debug - btf__dedup, btf__get_strings, btf__get_nr_types listed under 0.0.2 version ==================== Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'arch')
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