From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753003AbdLFWpZ (ORCPT ); Wed, 6 Dec 2017 17:45:25 -0500 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:46748 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752177AbdLFWpX (ORCPT ); Wed, 6 Dec 2017 17:45:23 -0500 Smtp-Origin-Hostprefix: devbig From: Song Liu Smtp-Origin-Hostname: devbig102.frc2.facebook.com To: , , , , , , CC: , Song Liu Smtp-Origin-Cluster: frc2c02 Subject: [PATCH v5 0/6] enable creating [k,u]probe with perf_event_open Date: Wed, 6 Dec 2017 14:45:10 -0800 Message-ID: <20171206224518.3598254-1-songliubraving@fb.com> X-Mailer: git-send-email 2.9.5 X-FB-Internal: Safe MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-12-06_08:,, signatures=0 X-Proofpoint-Spam-Reason: safe X-FB-Internal: Safe Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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