From: Daniel Xu <dxu@dxuuu.xyz>
To: songliubraving@fb.com, yhs@fb.com, andriin@fb.com
Cc: Daniel Xu <dxu@dxuuu.xyz>, bpf@vger.kernel.org, kernel-team@fb.com
Subject: [PATCH 0/3] Add PERF_EVENT_IOC_QUERY_KPROBE ioctl
Date: Tue, 6 Aug 2019 16:38:23 -0700 [thread overview]
Message-ID: <20190806233826.2478-1-dxu@dxuuu.xyz> (raw)
It's useful to know kprobe's nmissed and nhit stats. For example with
tracing tools, it's important to know when events may have been lost.
There is currently no way to get that information from the perf API.
This patch adds a new ioctl that lets users query this information.
Daniel Xu (3):
tracing/kprobe: Add PERF_EVENT_IOC_QUERY_KPROBE ioctl
libbpf: Add helper to extract perf fd from bpf_link
tracing/kprobe: Add self test for PERF_EVENT_IOC_QUERY_KPROBE
include/linux/trace_events.h | 6 +++
include/uapi/linux/perf_event.h | 23 ++++++++++
kernel/events/core.c | 11 +++++
kernel/trace/trace_kprobe.c | 25 +++++++++++
tools/include/uapi/linux/perf_event.h | 23 ++++++++++
tools/lib/bpf/libbpf.c | 13 ++++++
tools/lib/bpf/libbpf.h | 1 +
tools/lib/bpf/libbpf.map | 5 +++
.../selftests/bpf/prog_tests/attach_probe.c | 43 +++++++++++++++++++
9 files changed, 150 insertions(+)
--
2.20.1
next reply other threads:[~2019-08-06 23:39 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-06 23:38 Daniel Xu [this message]
2019-08-07 5:24 ` [PATCH 0/3] Add PERF_EVENT_IOC_QUERY_KPROBE ioctl Yonghong Song
2019-08-07 17:49 ` Song Liu
2019-08-07 19:03 ` Andrii Nakryiko
2019-08-08 22:32 ` Daniel Xu
2019-08-09 17:18 ` Andrii Nakryiko
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