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Message-ID: <20181219060227.1057679-1-songliubraving@fb.com>
Date: Tue, 18 Dec 2018 22:02:19 -0800
From: Song Liu <songliubraving@...com>
To: <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
CC: Song Liu <songliubraving@...com>, <peterz@...radead.org>,
<acme@...nel.org>, <ast@...nel.org>, <daniel@...earbox.net>,
<kernel-team@...com>
Subject: [PATCH v4 perf, bpf-next 0/7] reveal invisible bpf programs
This set catches symbol for all bpf programs loaded/unloaded
before/during/after perf-record run PERF_RECORD_KSYMBOL and
PERF_RECORD_BPF_EVENT.
PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT includes key information
of a bpf program load and unload. They are sent through perf ringbuffer,
and stored in perf.data. PERF_RECORD_KSYMBOL includes basic information
for simple profiling. It is ON by default. PERF_RECORD_BPF_EVENT is
used to gather more information of the bpf program. It is necessary for
perf-annotate of bpf programs.
Before this patch, perf-report will not be able to recover symbols of
bpf programs once the programs are unloaded.
This is to follow up Alexei's early effort [2] to show bpf programs via
mmap events.
Thanks,
Song
Changes v3 -> PATCH v4:
1. Split information about bpf program into PERF_RECORD_KSYMBOL (with
name, addr, len); and PERF_RECORD_BPF_EVENT PERF_RECORD_BPF_EVENT
(with id, tag);
2. Split the implementation in kernel and user space.
Changes v2 -> PATCH v3:
1. Rebase on bpf-next tree, and on top of BPF sub program tag patches [1]
for latest information in bpf_prog_info.
2. Complete handling and synthesizing PERF_RECORD_BPF_EVENT in perf.
Changes v1 -> PATCH v2:
1. Only 3 of the 5 patches in v1, to focus on ABI first;
2. Generate PERF_RECORD_BPF_EVENT per bpf sub program instead of per prog;
3. Modify PERF_RECORD_BPF_EVENT with more details (addr, len, name),
so that it can be used for basic profiling without calling sys_bpf.
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.
[1] https://patchwork.ozlabs.org/project/netdev/list/?series=81037
[2] https://www.spinics.net/lists/netdev/msg524232.html
Song Liu (7):
perf, bpf: Introduce PERF_RECORD_KSYMBOL
sync tools/include/uapi/linux/perf_event.h
perf, bpf: introduce PERF_RECORD_BPF_EVENT
sync tools/include/uapi/linux/perf_event.h
perf util: handle PERF_RECORD_KSYMBOL
perf util: handle PERF_RECORD_BPF_EVENT
perf tools: synthesize PERF_RECORD_* for loaded BPF programs
include/linux/filter.h | 7 +
include/linux/perf_event.h | 9 ++
include/uapi/linux/perf_event.h | 50 +++++-
kernel/bpf/core.c | 2 +-
kernel/bpf/syscall.c | 2 +
kernel/events/core.c | 218 ++++++++++++++++++++++++-
tools/include/uapi/linux/perf_event.h | 50 +++++-
tools/perf/builtin-record.c | 7 +
tools/perf/perf.h | 1 +
tools/perf/util/Build | 2 +
tools/perf/util/bpf-event.c | 219 ++++++++++++++++++++++++++
tools/perf/util/bpf-event.h | 16 ++
tools/perf/util/event.c | 40 +++++
tools/perf/util/event.h | 34 ++++
tools/perf/util/evsel.c | 19 +++
tools/perf/util/evsel.h | 2 +
tools/perf/util/machine.c | 60 +++++++
tools/perf/util/machine.h | 5 +-
tools/perf/util/session.c | 8 +
tools/perf/util/tool.h | 5 +-
20 files changed, 750 insertions(+), 6 deletions(-)
create mode 100644 tools/perf/util/bpf-event.c
create mode 100644 tools/perf/util/bpf-event.h
--
2.17.1
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