Dave Marchevsky 2b4b2621fd selftests/bpf: Add benchmark for local_storage RCU Tasks Trace usage ... This benchmark measures grace period latency and kthread cpu usage of RCU Tasks Trace when many processes are creating/deleting BPF local_storage. Intent here is to quantify improvement on these metrics after Paul's recent RCU Tasks patches [0]. Specifically, fork 15k tasks which call a bpf prog that creates/destroys task local_storage and sleep in a loop, resulting in many call_rcu_tasks_trace calls. To determine grace period latency, trace time elapsed between rcu_tasks_trace_pregp_step and rcu_tasks_trace_postgp; for cpu usage look at rcu_task_trace_kthread's stime in /proc/PID/stat. On my virtualized test environment (Skylake, 8 cpus) benchmark results demonstrate significant improvement: BEFORE Paul's patches: SUMMARY tasks_trace grace period latency avg 22298.551 us stddev 1302.165 us SUMMARY ticks per tasks_trace grace period avg 2.291 stddev 0.324 AFTER Paul's patches: SUMMARY tasks_trace grace period latency avg 16969.197 us stddev 2525.053 us SUMMARY ticks per tasks_trace grace period avg 1.146 stddev 0.178 Note that since these patches are not in bpf-next benchmarking was done by cherry-picking this patch onto rcu tree. [0] https://lore.kernel.org/rcu/20220620225402.GA3842369@paulmck-ThinkPad-P17-Gen-1/ Signed-off-by: Dave Marchevsky <davemarchevsky@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Paul E. McKenney <paulmck@kernel.org> Acked-by: Martin KaFai Lau <kafai@fb.com> Link: https://lore.kernel.org/bpf/20220705190018.3239050-1-davemarchevsky@fb.com		2022-07-07 16:35:21 +02:00
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bench_bloom_filter_map.c	selftests/bpf: Fix a tautological-constant-out-of-range-compare compiler warning	2021-11-12 14:11:46 -08:00
bench_bpf_hashmap_full_update.c	selftest/bpf/benchs: Add bpf_map benchmark	2022-06-11 14:25:35 -07:00
bench_bpf_loop.c	selftest/bpf/benchs: Add bpf_loop benchmark	2021-11-30 10:56:28 -08:00
bench_count.c	selftests/bpf: Fix checkpatch error on empty function parameter	2021-12-11 17:40:23 -08:00
bench_local_storage_rcu_tasks_trace.c	selftests/bpf: Add benchmark for local_storage RCU Tasks Trace usage	2022-07-07 16:35:21 +02:00
bench_local_storage.c	selftests/bpf: Add benchmark for local_storage get	2022-06-22 19:14:33 -07:00
bench_rename.c	selftests/bpf: Fix checkpatch error on empty function parameter	2021-12-11 17:40:23 -08:00
bench_ringbufs.c	selftests/bpf: use preferred setter/getter APIs instead of deprecated ones	2022-01-25 17:59:07 -08:00
bench_strncmp.c	selftests/bpf: Add benchmark for bpf_strncmp() helper	2021-12-11 17:40:23 -08:00
bench_trigger.c	selftests/bpf: fix uprobe offset calculation in selftests	2022-01-26 20:04:01 -08:00
run_bench_bloom_filter_map.sh	bpf/benchs: Add benchmarks for comparing hashmap lookups w/ vs. w/out bloom filter	2021-10-28 13:22:49 -07:00
run_bench_bpf_hashmap_full_update.sh	selftest/bpf/benchs: Add bpf_map benchmark	2022-06-11 14:25:35 -07:00
run_bench_bpf_loop.sh	selftest/bpf/benchs: Add bpf_loop benchmark	2021-11-30 10:56:28 -08:00
run_bench_local_storage_rcu_tasks_trace.sh	selftests/bpf: Add benchmark for local_storage RCU Tasks Trace usage	2022-07-07 16:35:21 +02:00
run_bench_local_storage.sh	selftests/bpf: Add benchmark for local_storage get	2022-06-22 19:14:33 -07:00
run_bench_rename.sh
run_bench_ringbufs.sh	bpf/benchs: Add benchmark tests for bloom filter throughput + false positive	2021-10-28 13:22:49 -07:00
run_bench_strncmp.sh	selftests/bpf: Add benchmark for bpf_strncmp() helper	2021-12-11 17:40:23 -08:00
run_bench_trigger.sh	selftest/bpf: Add BPF triggering benchmark	2020-05-13 12:19:38 -07:00
run_common.sh	selftests/bpf: Add benchmark for local_storage get	2022-06-22 19:14:33 -07:00