| Message ID | 20240430112830.1184228-1-jolsa@kernel.org (mailing list archive) |
|---|---|
| Headers | show |
| Series | bpf: Introduce kprobe_multi session attach | expand |
Hello: This series was applied to bpf/bpf-next.git (master) by Andrii Nakryiko <andrii@kernel.org>: On Tue, 30 Apr 2024 13:28:23 +0200 you wrote: > hi, > adding support to attach kprobe program through kprobe_multi link > in a session mode, which means: > - program is attached to both function entry and return > - entry program can decided if the return program gets executed > - entry program can share u64 cookie value with return program > > [...] Here is the summary with links: - [PATCHv2,bpf-next,1/7] bpf: Add support for kprobe session attach https://git.kernel.org/bpf/bpf-next/c/535a3692ba72 - [PATCHv2,bpf-next,2/7] bpf: Add support for kprobe session context https://git.kernel.org/bpf/bpf-next/c/adf46d88ae4b - [PATCHv2,bpf-next,3/7] bpf: Add support for kprobe session cookie https://git.kernel.org/bpf/bpf-next/c/5c919acef851 - [PATCHv2,bpf-next,4/7] libbpf: Add support for kprobe session attach https://git.kernel.org/bpf/bpf-next/c/2ca178f02b2f - [PATCHv2,bpf-next,5/7] libbpf: Add kprobe session attach type name to attach_type_name https://git.kernel.org/bpf/bpf-next/c/7b94965429f2 - [PATCHv2,bpf-next,6/7] selftests/bpf: Add kprobe session test https://git.kernel.org/bpf/bpf-next/c/0983b1697aef - [PATCHv2,bpf-next,7/7] selftests/bpf: Add kprobe session cookie test https://git.kernel.org/bpf/bpf-next/c/a3a5113393cc You are awesome, thank you!
hi, adding support to attach kprobe program through kprobe_multi link in a session mode, which means: - program is attached to both function entry and return - entry program can decided if the return program gets executed - entry program can share u64 cookie value with return program The initial RFC for this was posted in [0] and later discussed more and which ended up with the session idea [1] Having entry together with return probe for given function is common use case for tetragon, bpftrace and most likely for others. At the moment if we want both entry and return probe to execute bpf program we need to create two (entry and return probe) links. The link for return probe creates extra entry probe to setup the return probe. The extra entry probe execution could be omitted if we had a way to use just single link for both entry and exit probe. In addition the possibility to control the return program execution and sharing data within entry and return probe allows for other use cases. v2 changes: - renamed BPF_TRACE_KPROBE_MULTI_SESSION to BPF_TRACE_KPROBE_SESSION [Andrii] - use arrays for results in selftest [Andrii] - various small selftests and libbpf changes [Andrii] - moved the verifier cookie setup earlier in check_kfunc_call [Andrii] - added acks Also available at: https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/session_data thanks, jirka [0] https://lore.kernel.org/bpf/20240207153550.856536-1-jolsa@kernel.org/ [1] https://lore.kernel.org/bpf/20240228090242.4040210-1-jolsa@kernel.org/ --- Jiri Olsa (7): bpf: Add support for kprobe session attach bpf: Add support for kprobe session context bpf: Add support for kprobe session cookie libbpf: Add support for kprobe session attach libbpf: Add kprobe session attach type name to attach_type_name selftests/bpf: Add kprobe session test selftests/bpf: Add kprobe session cookie test include/uapi/linux/bpf.h | 1 + kernel/bpf/btf.c | 3 +++ kernel/bpf/syscall.c | 7 +++++- kernel/bpf/verifier.c | 7 ++++++ kernel/trace/bpf_trace.c | 106 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------------ tools/include/uapi/linux/bpf.h | 1 + tools/lib/bpf/bpf.c | 1 + tools/lib/bpf/libbpf.c | 40 +++++++++++++++++++++++++++++++-- tools/lib/bpf/libbpf.h | 4 +++- tools/testing/selftests/bpf/bpf_kfuncs.h | 3 +++ tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ tools/testing/selftests/bpf/progs/kprobe_multi_session.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ tools/testing/selftests/bpf/progs/kprobe_multi_session_cookie.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++ 13 files changed, 365 insertions(+), 18 deletions(-) create mode 100644 tools/testing/selftests/bpf/progs/kprobe_multi_session.c create mode 100644 tools/testing/selftests/bpf/progs/kprobe_multi_session_cookie.c