Messages in this thread | | | From | Song Liu <> | Subject | [PATCH perf,bpf 0/5] reveal invisible bpf programs | Date | Wed, 21 Nov 2018 11:54:57 -0800 |
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Changes RFC -> PATCH v1:
1. In perf-record, poll vip events in a separate thread; 2. Add tag to bpf prog name; 3. Small refactorings.
Original cover letter (with minor revisions):
This is to follow up Alexei's early effort to show bpf programs
https://www.spinics.net/lists/netdev/msg524232.html
In this version, PERF_RECORD_BPF_EVENT is introduced to send real time BPF load/unload events to user space. In user space, perf-record is modified to listen to these events (through a dedicated ring buffer) and generate detailed information about the program (struct bpf_prog_info_event). Then, perf-report translates these events into proper symbols.
With this set, perf-report will show bpf program as:
18.49% 0.16% test [kernel.vmlinux] [k] ksys_write 18.01% 0.47% test [kernel.vmlinux] [k] vfs_write 17.02% 0.40% test bpf_prog [k] bpf_prog_07367f7ba80df72b_ 16.97% 0.10% test [kernel.vmlinux] [k] __vfs_write 16.86% 0.12% test [kernel.vmlinux] [k] comm_write 16.67% 0.39% test [kernel.vmlinux] [k] bpf_probe_read
Note that, the program name is still work in progress, it will be cleaner with function types in BTF.
Please share your comments on this.
Thanks, Song
Song Liu (5): perf, bpf: Introduce PERF_RECORD_BPF_EVENT perf: sync tools/include/uapi/linux/perf_event.h perf util: basic handling of PERF_RECORD_BPF_EVENT perf util: introduce bpf_prog_info_event perf util: generate bpf_prog_info_event for short living bpf programs
include/linux/perf_event.h | 5 + include/uapi/linux/perf_event.h | 27 ++- kernel/bpf/syscall.c | 4 + kernel/events/core.c | 82 ++++++- tools/include/uapi/linux/perf_event.h | 27 ++- tools/perf/builtin-record.c | 91 +++++++- tools/perf/builtin-report.c | 2 + tools/perf/util/Build | 2 + tools/perf/util/bpf-info.c | 305 ++++++++++++++++++++++++++ tools/perf/util/bpf-info.h | 29 +++ tools/perf/util/event.c | 21 ++ tools/perf/util/event.h | 29 +++ tools/perf/util/evlist.c | 58 ++++- tools/perf/util/evlist.h | 6 + tools/perf/util/evsel.c | 9 + tools/perf/util/evsel.h | 3 + tools/perf/util/machine.c | 10 + tools/perf/util/machine.h | 2 + tools/perf/util/session.c | 8 + tools/perf/util/tool.h | 7 +- 20 files changed, 714 insertions(+), 13 deletions(-) create mode 100644 tools/perf/util/bpf-info.c create mode 100644 tools/perf/util/bpf-info.h
-- 2.17.1
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