> On Nov 12, 2017, at 3:40 PM, Song Liu <songliubrav...@fb.com> wrote: > > Changes v1 to v2: > Fix build issue reported by kbuild test bot by adding ifdef of > CONFIG_KPROBE_EVENTS, and CONFIG_UPROBE_EVENTS. > > v1 cover letter: > > This is to follow up the discussion over "new kprobe api" at Linux > Plumbers 2017: > > https://www.linuxplumbersconf.org/2017/ocw/proposals/4808 > > 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: > > https://github.com/liu-song-6/bcc/tree/new_perf_event_opn > > Thanks, > Song > > 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 | 39 ++++++- > 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, 643 insertions(+), 47 deletions(-) > create mode 100644 samples/bpf/test_many_kprobe_user.c > > -- > 2.9.5
Dear Peter, Could you please share feedback about this set? Thanks and Best Regards, Song
