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Message-Id: <20220418124834.829064-1-jolsa@kernel.org> Date: Mon, 18 Apr 2022 14:48:30 +0200 From: Jiri Olsa <jolsa@...nel.org> To: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, Masami Hiramatsu <mhiramat@...nel.org> Cc: netdev@...r.kernel.org, bpf@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>, Martin KaFai Lau <kafai@...com>, Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>, John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...omium.org> Subject: [PATCHv2 bpf-next 0/4] bpf: Speed up symbol resolving in kprobe multi link hi, sending additional fix for symbol resolving in kprobe multi link requested by Alexei and Andrii [1]. This speeds up bpftrace kprobe attachment, when using pure symbols (3344 symbols) to attach: Before: # perf stat -r 5 -e cycles ./src/bpftrace -e 'kprobe:x* { } i:ms:1 { exit(); }' ... 6.5681 +- 0.0225 seconds time elapsed ( +- 0.34% ) After: # perf stat -r 5 -e cycles ./src/bpftrace -e 'kprobe:x* { } i:ms:1 { exit(); }' ... 0.5661 +- 0.0275 seconds time elapsed ( +- 4.85% ) v2 changes (first version [2]): - removed the 2 seconds check [Alexei] - moving/forcing symbols sorting out of kallsyms_lookup_names function [Alexei] - skipping one array allocation and copy_from_user [Andrii] - several small fixes [Masami,Andrii] - build fix [kernel test robot] thanks, jirka [1] https://lore.kernel.org/bpf/CAEf4BzZtQaiUxQ-sm_hH2qKPRaqGHyOfEsW96DxtBHRaKLoL3Q@mail.gmail.com/ [2] https://lore.kernel.org/bpf/20220407125224.310255-1-jolsa@kernel.org/ --- Jiri Olsa (4): kallsyms: Add kallsyms_lookup_names function fprobe: Resolve symbols with kallsyms_lookup_names bpf: Resolve symbols with kallsyms_lookup_names for kprobe multi link selftests/bpf: Add attach bench test include/linux/kallsyms.h | 6 ++++++ kernel/kallsyms.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++- kernel/trace/bpf_trace.c | 113 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------------------------------------------- kernel/trace/fprobe.c | 32 ++++++++++++-------------------- tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c | 136 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ tools/testing/selftests/bpf/progs/kprobe_multi_empty.c | 12 ++++++++++++ 6 files changed, 302 insertions(+), 67 deletions(-) create mode 100644 tools/testing/selftests/bpf/progs/kprobe_multi_empty.c
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