LKML Archive on lore.kernel.org
 help / color / Atom feed
* [PATCH v5 0/6] enable creating [k,u]probe with perf_event_open
@ 2017-12-06 22:45 Song Liu
  2017-12-06 22:45 ` [PATCH v5] bcc: Try use new API to create " Song Liu
                   ` (10 more replies)
  0 siblings, 11 replies; 26+ messages in thread
From: Song Liu @ 2017-12-06 22:45 UTC (permalink / raw)
  To: peterz, rostedt, mingo, davem, netdev, linux-kernel, daniel
  Cc: kernel-team, Song Liu

Changes PATCH v4 to PATCH v5:
  Remove PERF_PROBE_CONFIG_IS_RETPROBE from uapi, use PMU_FORMAT_ATTR
  instead.

Changes PATCH v3 to PATCH v4:
  Remove uapi define MAX_PROBE_FUNC_NAME_LEN, use KSYM_NAME_LEN instead.
  Add flag PERF_PROBE_CONFIG_IS_RETPROBE for config field of [k,u]probe.
  Optimize ifdef's of CONFIG_KPROBE_EVENTS and CONFIG_UPROBE_EVENTS.
  Optimize checks in perf_event_is_tracing().
  Optimize perf_tp_register().

Changes PATCH v2 to PATCH v3:
  Remove fixed type PERF_TYPE_KPROBE and PERF_TYPE_UPROBE, use dynamic
  type instead.
  Update userspace (samples/bpf, bcc) to look up type from sysfs.
  Change License info in test_many_kprobe_user.c as Philippe Ombredanne
  suggested.

Changes PATCH v1 to PATCH v2:
  Split PERF_TYPE_PROBE into PERF_TYPE_KPROBE and PERF_TYPE_UPROBE.
  Split perf_probe into perf_kprobe and perf_uprobe.
  Remove struct probe_desc, use config1 and config2 instead.

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
  CONFIG_KPROBE_EVENTS, and CONFIG_UPROBE_EVENTS.

RFC 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/perf_event_open

Thanks,
Song

man-pages patch:
  perf_event_open.2: add type kprobe and uprobe

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

kernel patches:

Song Liu (6):
  perf: prepare perf_event.h for new types perf_kprobe and perf_uprobe
  perf: copy new perf_event.h to tools/include/uapi
  perf: implement pmu perf_kprobe
  perf: implement pmu perf_uprobe
  bpf: add option for bpf_load.c to use perf_kprobe
  bpf: add new test test_many_kprobe

 include/linux/trace_events.h          |   8 ++
 include/uapi/linux/perf_event.h       |   4 +
 kernel/events/core.c                  | 131 +++++++++++++++++++++++-
 kernel/trace/trace_event_perf.c       | 102 +++++++++++++++++++
 kernel/trace/trace_kprobe.c           |  91 +++++++++++++++--
 kernel/trace/trace_probe.h            |  11 ++
 kernel/trace/trace_uprobe.c           |  86 ++++++++++++++--
 samples/bpf/Makefile                  |   3 +
 samples/bpf/bpf_load.c                |  66 ++++++++++--
 samples/bpf/bpf_load.h                |  14 +++
 samples/bpf/test_many_kprobe_user.c   | 186 ++++++++++++++++++++++++++++++++++
 tools/include/uapi/linux/perf_event.h |   4 +
 12 files changed, 677 insertions(+), 29 deletions(-)
 create mode 100644 samples/bpf/test_many_kprobe_user.c

--
2.9.5

^ permalink raw reply	[flat|nested] 26+ messages in thread

end of thread, back to index

Thread overview: 26+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-12-06 22:45 [PATCH v5 0/6] enable creating [k,u]probe with perf_event_open Song Liu
2017-12-06 22:45 ` [PATCH v5] bcc: Try use new API to create " Song Liu
2017-12-06 22:45 ` [PATCH v5] perf_event_open.2: add type kprobe and uprobe Song Liu
2017-12-06 22:45 ` [PATCH v5 1/6] perf: prepare perf_event.h for new types perf_kprobe and perf_uprobe Song Liu
2018-02-06 11:52   ` [tip:perf/core] perf/core: Prepare perf_event.h for new types: 'perf_kprobe' and 'perf_uprobe' tip-bot for Song Liu
2017-12-06 22:45 ` [PATCH v5 2/6] perf: copy new perf_event.h to tools/include/uapi Song Liu
2018-02-06 11:52   ` [tip:perf/core] perf/headers: Sync new perf_event.h with the tools/include/uapi version tip-bot for Song Liu
2018-02-13 22:38     ` Alexei Starovoitov
2018-02-14  7:51       ` Ingo Molnar
2017-12-06 22:45 ` [PATCH v5 3/6] perf: implement pmu perf_kprobe Song Liu
2017-12-20 10:03   ` Peter Zijlstra
2017-12-20 10:14     ` Peter Zijlstra
2017-12-20 18:10       ` Song Liu
2017-12-20 21:25         ` Peter Zijlstra
2017-12-20 22:05           ` Song Liu
2018-02-06 11:59   ` [tip:perf/core] perf/core: Implement the 'perf_kprobe' PMU tip-bot for Song Liu
2017-12-06 22:45 ` [PATCH v5 4/6] perf: implement pmu perf_uprobe Song Liu
2018-02-06 11:59   ` [tip:perf/core] perf/core: Implement the 'perf_uprobe' PMU tip-bot for Song Liu
2017-12-06 22:45 ` [PATCH v5 5/6] bpf: add option for bpf_load.c to use perf_kprobe Song Liu
2017-12-06 22:45 ` [PATCH v5 6/6] bpf: add new test test_many_kprobe Song Liu
2017-12-07 10:23 ` [PATCH v5 0/6] enable creating [k,u]probe with perf_event_open Philippe Ombredanne
2017-12-08 19:57 ` Daniel Borkmann
2017-12-19 17:24   ` Song Liu
2017-12-19 20:25     ` Peter Zijlstra
2018-04-10  4:45 ` Ravi Bangoria
2018-04-10  4:54   ` Alexei Starovoitov

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git
	git clone --mirror https://lore.kernel.org/lkml/8 lkml/git/8.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git