user/sven/linux.git/samples/bpf/trace_event_user.c, branch v5.16

bpf: samples: Do not touch RLIMIT_MEMLOCK

2020-12-03T02:32:47Z

Since bpf is not using rlimit memlock for the memory accounting and control, do not change the limit in sample applications. Signed-off-by: Roman Gushchin Signed-off-by: Alexei Starovoitov Acked-by: Song Liu Link: https://lore.kernel.org/bpf/20201201215900.3569844-35-guro@fb.com

samples, bpf: Refactor pointer error check with libbpf

2020-05-19T15:12:49Z

Current method of checking pointer error is not user friendly. Especially the __must_check define makes this less intuitive. Since, libbpf has an API libbpf_get_error() which checks pointer error, this commit refactors existing pointer error check logic with libbpf. Signed-off-by: Daniel T. Lee Signed-off-by: Daniel Borkmann Acked-by: Yonghong Song Link: https://lore.kernel.org/bpf/20200516040608.1377876-2-danieltimlee@gmail.com

samples, bpf: Refactor perf_event user program with libbpf bpf_link

2020-03-23T21:27:57Z

The bpf_program__attach of libbpf(using bpf_link) is much more intuitive than the previous method using ioctl. bpf_program__attach_perf_event manages the enable of perf_event and attach of BPF programs to it, so there's no neeed to do this directly with ioctl. In addition, bpf_link provides consistency in the use of API because it allows disable (detach, destroy) for multiple events to be treated as one bpf_link__destroy. Also, bpf_link__destroy manages the close() of perf_event fd. This commit refactors samples that attach the bpf program to perf_event by using libbbpf instead of ioctl. Also the bpf_load in the samples were removed and migrated to use libbbpf API. Signed-off-by: Daniel T. Lee Signed-off-by: Daniel Borkmann Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20200321100424.1593964-3-danieltimlee@gmail.com

samples/bpf: Use consistent include paths for libbpf

2020-01-21T00:37:45Z

Fix all files in samples/bpf to include libbpf header files with the bpf/ prefix, to be consistent with external users of the library. Also ensure that all includes of exported libbpf header files (those that are exported on 'make install' of the library) use bracketed includes instead of quoted. To make sure no new files are introduced that doesn't include the bpf/ prefix in its include, remove tools/lib/bpf from the include path entirely, and use tools/lib instead. Fixes: 6910d7d3867a ("selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir") Signed-off-by: Toke Høiland-Jørgensen Signed-off-by: Alexei Starovoitov Acked-by: Jesper Dangaard Brouer Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/157952560911.1683545.8795966751309534150.stgit@toke.dk

samples: bpf: Replace symbol compare of trace_event

2019-12-11T23:27:28Z

Previously, when this sample is added, commit 1c47910ef8013 ("samples/bpf: add perf_event+bpf example"), a symbol 'sys_read' and 'sys_write' has been used without no prefixes. But currently there are no exact symbols with these under kallsyms and this leads to failure. This commit changes exact compare to substring compare to keep compatible with exact symbol or prefixed symbol. Fixes: 1c47910ef8013 ("samples/bpf: add perf_event+bpf example") Signed-off-by: Daniel T. Lee Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20191205080114.19766-2-danieltimlee@gmail.com

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206

2019-05-30T18:29:53Z

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of version 2 of the gnu general public license as published by the free software foundation extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 107 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Reviewed-by: Richard Fontana Reviewed-by: Steve Winslow Reviewed-by: Alexios Zavras Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528171438.615055994@linutronix.de Signed-off-by: Greg Kroah-Hartman

samples, selftests/bpf: add NULL check for ksym_search

2019-04-04T14:43:47Z

Since, ksym_search added with verification logic for symbols existence, it could return NULL when the kernel symbols are not loaded. This commit will add NULL check logic after ksym_search. Signed-off-by: Daniel T. Lee Signed-off-by: Daniel Borkmann

samples/bpf: Check the result of system()

2018-07-05T07:58:52Z

To avoid the below build warning message, use new generate_load() checking the return value. ignoring return value of ‘system’, declared with attribute warn_unused_result And it also refactors the duplicate code of both test_perf_event_all_cpu() and test_perf_event_task() Cc: Teng Qin Signed-off-by: Taeung Song Acked-by: David S. Miller Signed-off-by: Daniel Borkmann

samples/bpf: move common-purpose trace functions to selftests

2018-04-29T15:45:54Z

There is no functionality change in this patch. The common-purpose trace functions, including perf_event polling and ksym lookup, are moved from trace_output_user.c and bpf_load.c to selftests/bpf/trace_helpers.c so that these function can be reused later in selftests. Acked-by: Alexei Starovoitov Signed-off-by: Yonghong Song Signed-off-by: Alexei Starovoitov

samples/bpf: add example to test reading address

2018-03-08T01:22:34Z

This commit adds additional test in the trace_event example, by attaching the bpf program to MEM_UOPS_RETIRED.LOCK_LOADS event with PERF_SAMPLE_ADDR requested, and print the lock address value read from the bpf program to trace_pipe. Signed-off-by: Teng Qin Signed-off-by: Daniel Borkmann