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Subject[PATCH 0/6] enable creating [k,u]probe with perf_event_open
Changes RFC v2 to PATCH v1:
Check type PERF_TYPE_PROBE in perf_event_set_filter().
Rebase on to tip perf/core.

Changes RFC v1 to RFC v2:
Fix build issue reported by kbuild test bot by adding ifdef of

RFC v1 cover letter:

This is to follow up the discussion over "new kprobe api" at Linux
Plumbers 2017:

With current kernel, user space tools can only create/destroy [k,u]probes
with a text-based API (kprobe_events and uprobe_events in tracefs). This
approach relies on user space to clean up the [k,u]probe after using them.
However, this is not easy for user space to clean up properly.

To solve this problem, we introduce a file descriptor based API.
Specifically, we extended perf_event_open to create [k,u]probe, and attach
this [k,u]probe to the file descriptor created by perf_event_open. These
[k,u]probe are associated with this file descriptor, so they are not
available in tracefs.

We reuse large portion of existing trace_kprobe and trace_uprobe code.
Currently, the file descriptor API does not support arguments as the
text-based API does. This should not be a problem, as user of the file
decriptor based API read data through other methods (bpf, etc.).

I also include a patch to to bcc, and a patch to man-page perf_even_open.
Please see the list below. A fork of bcc with this patch is also available
on github:


man-pages patch:
perf_event_open.2: add new type PERF_TYPE_PROBE

bcc patch:
bcc: Try use new API to create [k,u]probe with perf_event_open

kernel patches:

Song Liu (6):
perf: Add new type PERF_TYPE_PROBE
perf: copy new perf_event.h to tools/include/uapi
perf: implement kprobe support to PERF_TYPE_PROBE
perf: implement uprobe support to PERF_TYPE_PROBE
bpf: add option for bpf_load.c to use PERF_TYPE_PROBE
bpf: add new test test_many_kprobe

include/linux/trace_events.h | 2 +
include/uapi/linux/perf_event.h | 35 ++++++-
kernel/events/core.c | 41 +++++++-
kernel/trace/trace_event_perf.c | 127 +++++++++++++++++++++++
kernel/trace/trace_kprobe.c | 91 +++++++++++++++--
kernel/trace/trace_probe.h | 11 ++
kernel/trace/trace_uprobe.c | 90 +++++++++++++++--
samples/bpf/Makefile | 3 +
samples/bpf/bpf_load.c | 61 ++++++-----
samples/bpf/bpf_load.h | 12 +++
samples/bpf/test_many_kprobe_user.c | 184 ++++++++++++++++++++++++++++++++++
tools/include/uapi/linux/perf_event.h | 35 ++++++-
12 files changed, 644 insertions(+), 48 deletions(-)
create mode 100644 samples/bpf/test_many_kprobe_user.c


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