mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-19 17:11:03 +00:00
58e975d014
The test_overhead bpf program is designed to compare performance between tracepoint and kprobe. Initially it used task_rename and urandom_read tracepoint. However, commit14c174633f("random: remove unused tracepoints") removed urandom_read tracepoint, and for this reason the test_overhead got broken. This commit introduces new microbenchmark using fib_table_lookup. This microbenchmark sends UDP packets to localhost in order to invoke fib_table_lookup. In a nutshell: fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); addr.sin_addr.s_addr = inet_addr(DUMMY_IP); addr.sin_port = htons(DUMMY_PORT); for() { sendto(fd, buf, strlen(buf), 0, (struct sockaddr *)&addr, sizeof(addr)); } on 4 cpus in parallel: lookup per sec base (no tracepoints, no kprobes) 381k with kprobe at fib_table_lookup() 325k with tracepoint at fib:fib_table_lookup 330k with raw_tracepoint at fib:fib_table_lookup 365k Fixes:14c174633f("random: remove unused tracepoints") Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com> Link: https://lore.kernel.org/r/20230115071613.125791-6-danieltimlee@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
17 lines
365 B
C
17 lines
365 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright (c) 2018 Facebook */
|
|
#include <uapi/linux/bpf.h>
|
|
#include <bpf/bpf_helpers.h>
|
|
|
|
SEC("raw_tracepoint/task_rename")
|
|
int prog(struct bpf_raw_tracepoint_args *ctx)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
SEC("raw_tracepoint/fib_table_lookup")
|
|
int prog2(struct bpf_raw_tracepoint_args *ctx)
|
|
{
|
|
return 0;
|
|
}
|
|
char _license[] SEC("license") = "GPL";
|