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https://github.com/Fishwaldo/Star64_linux.git
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samples/bpf: add tracepoint vs kprobe performance tests
the first microbenchmark does fd=open("/proc/self/comm"); for() { write(fd, "test"); } and on 4 cpus in parallel: writes per sec base (no tracepoints, no kprobes) 930k with kprobe at __set_task_comm() 420k with tracepoint at task:task_rename 730k For kprobe + full bpf program manully fetches oldcomm, newcomm via bpf_probe_read. For tracepint bpf program does nothing, since arguments are copied by tracepoint. 2nd microbenchmark does: fd=open("/dev/urandom"); for() { read(fd, buf); } and on 4 cpus in parallel: reads per sec base (no tracepoints, no kprobes) 300k with kprobe at urandom_read() 279k with tracepoint at random:urandom_read 290k bpf progs attached to kprobe and tracepoint are noop. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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4 changed files with 244 additions and 0 deletions
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@ -19,6 +19,7 @@ hostprogs-y += lathist
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hostprogs-y += offwaketime
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hostprogs-y += offwaketime
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hostprogs-y += spintest
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hostprogs-y += spintest
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hostprogs-y += map_perf_test
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hostprogs-y += map_perf_test
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hostprogs-y += test_overhead
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test_verifier-objs := test_verifier.o libbpf.o
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test_verifier-objs := test_verifier.o libbpf.o
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test_maps-objs := test_maps.o libbpf.o
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test_maps-objs := test_maps.o libbpf.o
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@ -38,6 +39,7 @@ lathist-objs := bpf_load.o libbpf.o lathist_user.o
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offwaketime-objs := bpf_load.o libbpf.o offwaketime_user.o
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offwaketime-objs := bpf_load.o libbpf.o offwaketime_user.o
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spintest-objs := bpf_load.o libbpf.o spintest_user.o
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spintest-objs := bpf_load.o libbpf.o spintest_user.o
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map_perf_test-objs := bpf_load.o libbpf.o map_perf_test_user.o
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map_perf_test-objs := bpf_load.o libbpf.o map_perf_test_user.o
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test_overhead-objs := bpf_load.o libbpf.o test_overhead_user.o
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# Tell kbuild to always build the programs
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# Tell kbuild to always build the programs
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always := $(hostprogs-y)
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always := $(hostprogs-y)
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@ -56,6 +58,8 @@ always += lathist_kern.o
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always += offwaketime_kern.o
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always += offwaketime_kern.o
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always += spintest_kern.o
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always += spintest_kern.o
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always += map_perf_test_kern.o
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always += map_perf_test_kern.o
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always += test_overhead_tp_kern.o
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always += test_overhead_kprobe_kern.o
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HOSTCFLAGS += -I$(objtree)/usr/include
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HOSTCFLAGS += -I$(objtree)/usr/include
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@ -75,6 +79,7 @@ HOSTLOADLIBES_lathist += -lelf
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HOSTLOADLIBES_offwaketime += -lelf
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HOSTLOADLIBES_offwaketime += -lelf
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HOSTLOADLIBES_spintest += -lelf
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HOSTLOADLIBES_spintest += -lelf
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HOSTLOADLIBES_map_perf_test += -lelf -lrt
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HOSTLOADLIBES_map_perf_test += -lelf -lrt
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HOSTLOADLIBES_test_overhead += -lelf -lrt
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# point this to your LLVM backend with bpf support
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# point this to your LLVM backend with bpf support
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LLC=$(srctree)/tools/bpf/llvm/bld/Debug+Asserts/bin/llc
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LLC=$(srctree)/tools/bpf/llvm/bld/Debug+Asserts/bin/llc
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41
samples/bpf/test_overhead_kprobe_kern.c
Normal file
41
samples/bpf/test_overhead_kprobe_kern.c
Normal file
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@ -0,0 +1,41 @@
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/* Copyright (c) 2016 Facebook
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#include <linux/version.h>
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#include <linux/ptrace.h>
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#include <uapi/linux/bpf.h>
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#include "bpf_helpers.h"
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#define _(P) ({typeof(P) val = 0; bpf_probe_read(&val, sizeof(val), &P); val;})
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SEC("kprobe/__set_task_comm")
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int prog(struct pt_regs *ctx)
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{
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struct signal_struct *signal;
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struct task_struct *tsk;
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char oldcomm[16] = {};
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char newcomm[16] = {};
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u16 oom_score_adj;
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u32 pid;
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tsk = (void *)PT_REGS_PARM1(ctx);
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pid = _(tsk->pid);
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bpf_probe_read(oldcomm, sizeof(oldcomm), &tsk->comm);
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bpf_probe_read(newcomm, sizeof(newcomm), (void *)PT_REGS_PARM2(ctx));
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signal = _(tsk->signal);
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oom_score_adj = _(signal->oom_score_adj);
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return 0;
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}
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SEC("kprobe/urandom_read")
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int prog2(struct pt_regs *ctx)
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{
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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u32 _version SEC("version") = LINUX_VERSION_CODE;
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36
samples/bpf/test_overhead_tp_kern.c
Normal file
36
samples/bpf/test_overhead_tp_kern.c
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@ -0,0 +1,36 @@
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/* Copyright (c) 2016 Facebook
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#include <uapi/linux/bpf.h>
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#include "bpf_helpers.h"
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/* from /sys/kernel/debug/tracing/events/task/task_rename/format */
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struct task_rename {
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__u64 pad;
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__u32 pid;
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char oldcomm[16];
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char newcomm[16];
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__u16 oom_score_adj;
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};
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SEC("tracepoint/task/task_rename")
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int prog(struct task_rename *ctx)
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{
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return 0;
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}
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/* from /sys/kernel/debug/tracing/events/random/urandom_read/format */
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struct urandom_read {
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__u64 pad;
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int got_bits;
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int pool_left;
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int input_left;
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};
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SEC("tracepoint/random/urandom_read")
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int prog2(struct urandom_read *ctx)
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{
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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162
samples/bpf/test_overhead_user.c
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162
samples/bpf/test_overhead_user.c
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@ -0,0 +1,162 @@
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/* Copyright (c) 2016 Facebook
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#define _GNU_SOURCE
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#include <sched.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <asm/unistd.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <assert.h>
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#include <sys/wait.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <linux/bpf.h>
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#include <string.h>
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#include <time.h>
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#include <sys/resource.h>
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#include "libbpf.h"
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#include "bpf_load.h"
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#define MAX_CNT 1000000
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static __u64 time_get_ns(void)
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{
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struct timespec ts;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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return ts.tv_sec * 1000000000ull + ts.tv_nsec;
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}
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static void test_task_rename(int cpu)
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{
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__u64 start_time;
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char buf[] = "test\n";
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int i, fd;
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fd = open("/proc/self/comm", O_WRONLY|O_TRUNC);
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if (fd < 0) {
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printf("couldn't open /proc\n");
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exit(1);
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}
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start_time = time_get_ns();
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for (i = 0; i < MAX_CNT; i++)
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write(fd, buf, sizeof(buf));
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printf("task_rename:%d: %lld events per sec\n",
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cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
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close(fd);
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}
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static void test_urandom_read(int cpu)
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{
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__u64 start_time;
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char buf[4];
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int i, fd;
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fd = open("/dev/urandom", O_RDONLY);
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if (fd < 0) {
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printf("couldn't open /dev/urandom\n");
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exit(1);
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}
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start_time = time_get_ns();
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for (i = 0; i < MAX_CNT; i++)
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read(fd, buf, sizeof(buf));
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printf("urandom_read:%d: %lld events per sec\n",
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cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
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close(fd);
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}
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static void loop(int cpu, int flags)
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{
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cpu_set_t cpuset;
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CPU_ZERO(&cpuset);
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CPU_SET(cpu, &cpuset);
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sched_setaffinity(0, sizeof(cpuset), &cpuset);
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if (flags & 1)
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test_task_rename(cpu);
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if (flags & 2)
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test_urandom_read(cpu);
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}
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static void run_perf_test(int tasks, int flags)
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{
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pid_t pid[tasks];
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int i;
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for (i = 0; i < tasks; i++) {
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pid[i] = fork();
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if (pid[i] == 0) {
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loop(i, flags);
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exit(0);
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} else if (pid[i] == -1) {
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printf("couldn't spawn #%d process\n", i);
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exit(1);
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}
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}
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for (i = 0; i < tasks; i++) {
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int status;
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assert(waitpid(pid[i], &status, 0) == pid[i]);
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assert(status == 0);
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}
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}
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static void unload_progs(void)
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{
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close(prog_fd[0]);
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close(prog_fd[1]);
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close(event_fd[0]);
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close(event_fd[1]);
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}
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int main(int argc, char **argv)
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{
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struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
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char filename[256];
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int num_cpu = 8;
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int test_flags = ~0;
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setrlimit(RLIMIT_MEMLOCK, &r);
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if (argc > 1)
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test_flags = atoi(argv[1]) ? : test_flags;
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if (argc > 2)
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num_cpu = atoi(argv[2]) ? : num_cpu;
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if (test_flags & 0x3) {
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printf("BASE\n");
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run_perf_test(num_cpu, test_flags);
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}
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if (test_flags & 0xC) {
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snprintf(filename, sizeof(filename),
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"%s_kprobe_kern.o", argv[0]);
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if (load_bpf_file(filename)) {
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printf("%s", bpf_log_buf);
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return 1;
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}
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printf("w/KPROBE\n");
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run_perf_test(num_cpu, test_flags >> 2);
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unload_progs();
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}
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if (test_flags & 0x30) {
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snprintf(filename, sizeof(filename),
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"%s_tp_kern.o", argv[0]);
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if (load_bpf_file(filename)) {
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printf("%s", bpf_log_buf);
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return 1;
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}
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printf("w/TRACEPOINT\n");
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run_perf_test(num_cpu, test_flags >> 4);
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unload_progs();
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}
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return 0;
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}
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