AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2025-01-16 04:36:18 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity
c5d420c32c
linux_dsm_epyc7002/tools/testing/selftests/bpf
History
Andrii Nakryiko c5d420c32c selftest/bpf: Add BPF triggering benchmark 
It is sometimes desirable to be able to trigger BPF program from user-space
with minimal overhead. sys_enter would seem to be a good candidate, yet in
a lot of cases there will be a lot of noise from syscalls triggered by other
processes on the system. So while searching for low-overhead alternative, I've
stumbled upon getpgid() syscall, which seems to be specific enough to not
suffer from accidental syscall by other apps.

This set of benchmarks compares tp, raw_tp w/ filtering by syscall ID, kprobe,
fentry and fmod_ret with returning error (so that syscall would not be
executed), to determine the lowest-overhead way. Here are results on my
machine (using benchs/run_bench_trigger.sh script):

  base      :    9.200 ± 0.319M/s
  tp        :    6.690 ± 0.125M/s
  rawtp     :    8.571 ± 0.214M/s
  kprobe    :    6.431 ± 0.048M/s
  fentry    :    8.955 ± 0.241M/s
  fmodret   :    8.903 ± 0.135M/s

So it seems like fmodret doesn't give much benefit for such lightweight
syscall. Raw tracepoint is pretty decent despite additional filtering logic,
but it will be called for any other syscall in the system, which rules it out.
Fentry, though, seems to be adding the least amoung of overhead and achieves
97.3% of performance of baseline no-BPF-attached syscall.

Using getpgid() seems to be preferable to set_task_comm() approach from
test_overhead, as it's about 2.35x faster in a baseline performance.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20200512192445.2351848-5-andriin@fb.com
2020-05-13 12:19:38 -07:00
..
benchs selftest/bpf: Add BPF triggering benchmark 2020-05-13 12:19:38 -07:00
gnu
map_tests .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
prog_tests selftest/bpf: Fmod_ret prog and implement test_overhead as part of bench 2020-05-13 12:19:38 -07:00
progs selftest/bpf: Add BPF triggering benchmark 2020-05-13 12:19:38 -07:00
verifier selftests/bpf: Test allowed maps for bpf_sk_select_reuseport 2020-04-30 16:21:14 +02:00
.gitignore selftests/bpf: Add benchmark runner infrastructure 2020-05-13 12:19:38 -07:00
bench.c selftest/bpf: Add BPF triggering benchmark 2020-05-13 12:19:38 -07:00
bench.h selftests/bpf: Add benchmark runner infrastructure 2020-05-13 12:19:38 -07:00
bpf_legacy.h selftests/bpf: samples/bpf: Split off legacy stuff from bpf_helpers.h 2019-10-08 23:16:03 +02:00
bpf_rand.h
bpf_rlimit.h
bpf_tcp_helpers.h libbpf: Merge selftests' bpf_trace_helpers.h into libbpf's bpf_tracing.h 2020-03-02 16:25:14 -08:00
bpf_util.h selftests: Use consistent include paths for libbpf 2020-01-20 16:37:45 -08:00
cgroup_helpers.c selftests/bpf: Correct path to include msg + path 2019-10-03 17:21:57 +02:00
cgroup_helpers.h
config selftests/bpf: Use reno instead of dctcp 2020-05-01 16:51:07 -07:00
flow_dissector_load.c
flow_dissector_load.h
get_cgroup_id_user.c
Makefile selftest/bpf: Add BPF triggering benchmark 2020-05-13 12:19:38 -07:00
netcnt_common.h
network_helpers.c selftests/bpf: Move existing common networking parts into network_helpers 2020-05-09 00:48:20 +02:00
network_helpers.h selftests/bpf: Move existing common networking parts into network_helpers 2020-05-09 00:48:20 +02:00
tcp_client.py
tcp_server.py
test_align.c selftests/bpf: fix test_align liveliness expectations 2019-07-06 00:16:56 +02:00
test_bpftool_build.sh selftests, bpftool: Skip the build test if not in tree 2019-11-24 16:58:45 -08:00
test_bpftool.py selftests/bpf: Add test for "bpftool feature" command 2020-02-26 18:34:34 +01:00
test_bpftool.sh selftests/bpf: Add test for "bpftool feature" command 2020-02-26 18:34:34 +01:00
test_btf.c selftests/bpf: Fix a couple of broken test_btf cases 2020-04-24 17:47:40 -07:00
test_btf.h bpf: Refactor BTF encoding macro to test_btf.h 2019-04-27 09:07:05 -07:00
test_cgroup_storage.c selftests/bpf: fix test_cgroup_storage on s390 2019-08-21 16:55:01 +02:00
test_cpp.cpp selftests: Use consistent include paths for libbpf 2020-01-20 16:37:45 -08:00
test_current_pid_tgid_new_ns.c tools/testing/selftests/bpf: Add self-tests for new helper bpf_get_ns_current_pid_tgid. 2020-03-12 17:40:47 -07:00
test_dev_cgroup.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
test_flow_dissector.c
test_flow_dissector.sh selftests/bpf: Add test based on port range for BPF flow dissector 2020-01-27 11:25:07 +01:00
test_ftrace.sh selftests/bpf: Test function_graph tracer and bpf trampoline together 2019-12-11 15:19:29 -08:00
test_iptunnel_common.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
test_kmod.sh
test_lirc_mode2_user.c
test_lirc_mode2.sh
test_lpm_map.c bpf: lpm_trie: check left child of last leftmost node for NULL 2019-06-11 13:52:37 +02:00
test_lru_map.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
test_lwt_ip_encap.sh selftests/bpf: More compatible nc options in test_lwt_ip_encap 2019-10-08 23:59:22 +02:00
test_lwt_seg6local.sh
test_maps.c bpf, sockmap: Allow inserting listening TCP sockets into sockmap 2020-02-21 22:29:45 +01:00
test_maps.h bpf: Add BPF_MAP_TYPE_SK_STORAGE test to test_maps 2019-04-27 09:07:05 -07:00
test_netcnt.c
test_offload.py selftests: bpf: log direct file writes 2019-11-06 09:59:58 -08:00
test_progs.c selftests/bpf: Extract parse_num_list into generic testing_helpers.c 2020-05-13 12:19:38 -07:00
test_progs.h selftests/bpf: Extract parse_num_list into generic testing_helpers.c 2020-05-13 12:19:38 -07:00
test_select_reuseport_common.h
test_skb_cgroup_id_user.c selftests/bpf: Don't hard-code root cgroup id 2019-12-04 17:56:22 -08:00
test_skb_cgroup_id.sh
test_sock_addr.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-17 20:20:36 -07:00
test_sock_addr.sh
test_sock_fields.c selftests: bpf: enable hi32 randomization for all tests 2019-05-24 18:58:37 -07:00
test_sock.c selftests: Use consistent include paths for libbpf 2020-01-20 16:37:45 -08:00
test_socket_cookie.c selftests/bpf: convert socket_cookie test to sk storage 2019-06-15 01:21:59 +02:00
test_sockmap_kern.h selftests: Use consistent include paths for libbpf 2020-01-20 16:37:45 -08:00
test_sockmap.c selftests: bpf: Use a temporary file in test_sockmap 2020-01-24 22:12:13 +01:00
test_stub.c selftests/bpf: Integrate verbose verifier log into test_progs 2019-11-24 16:58:45 -08:00
test_sysctl.c selftests: Use consistent include paths for libbpf 2020-01-20 16:37:45 -08:00
test_tag.c
test_tc_edt.sh selftests/bpf: More compatible nc options in test_tc_edt 2019-10-18 22:33:57 +02:00
test_tc_tunnel.sh selftests, bpf: Fix test_tc_tunnel hanging 2019-11-18 21:31:49 +01:00
test_tcp_check_syncookie_user.c selftests/bpf: add test for bpf_tcp_gen_syncookie 2019-07-30 21:03:05 -07:00
test_tcp_check_syncookie.sh selftests/bpf: add test for bpf_tcp_gen_syncookie 2019-07-30 21:03:05 -07:00
test_tcpbpf_user.c selftests/bpf: De-flake test_tcpbpf 2019-12-04 18:01:05 -08:00
test_tcpbpf.h selftests/bpf: De-flake test_tcpbpf 2019-12-04 18:01:05 -08:00
test_tcpnotify_user.c selftests/bpf: switch test_tcpnotify to perf_buffer API 2019-07-23 16:05:42 -07:00
test_tcpnotify.h
test_tunnel.sh selftests/bpf: fail test_tunnel.sh if subtests fail 2019-05-28 11:08:57 +02:00
test_verifier_log.c
test_verifier.c selftests/bpf: Test allowed maps for bpf_sk_select_reuseport 2020-04-30 16:21:14 +02:00
test_xdp_meta.sh
test_xdp_redirect.sh
test_xdp_veth.sh selftests, bpf: Add test for veth native XDP 2019-06-24 18:18:30 -07:00
test_xdp_vlan_mode_generic.sh selftests/bpf: add wrapper scripts for test_xdp_vlan.sh 2019-08-05 11:17:40 -07:00
test_xdp_vlan_mode_native.sh selftests/bpf: add wrapper scripts for test_xdp_vlan.sh 2019-08-05 11:17:40 -07:00
test_xdp_vlan.sh selftests/bpf: reduce time to execute test_xdp_vlan.sh 2019-08-05 11:17:40 -07:00
test_xdping.sh selftests/bpf: measure RTT from xdp using xdping 2019-05-31 19:53:45 -07:00
testing_helpers.c selftests/bpf: Extract parse_num_list into generic testing_helpers.c 2020-05-13 12:19:38 -07:00
testing_helpers.h selftests/bpf: Extract parse_num_list into generic testing_helpers.c 2020-05-13 12:19:38 -07:00
trace_helpers.c samples, bpf: Move read_trace_pipe to trace_helpers 2020-03-23 22:27:51 +01:00
trace_helpers.h samples, bpf: Move read_trace_pipe to trace_helpers 2020-03-23 22:27:51 +01:00
urandom_read.c
with_addr.sh
with_tunnels.sh
xdping.c selftests: bpf: correct perror strings 2019-11-28 22:40:30 -08:00
xdping.h selftests/bpf: measure RTT from xdp using xdping 2019-05-31 19:53:45 -07:00