mirror of
https://github.com/torvalds/linux.git
synced 2024-11-01 04:53:36 +01:00
samples/bpf: Remove sample tracex2
In commitba8de796ba("net: introduce sk_skb_reason_drop function") kfree_skb_reason() becomes an inline function and cannot be traced. samples/bpf is abandonware by now, and we should slowly but surely convert whatever makes sense into BPF selftests under tools/testing/selftests/bpf and just get rid of the rest. Link:ba8de796baSigned-off-by: Rong Tao <rongtao@cestc.cn> Link: https://lore.kernel.org/r/tencent_30ADAC88CB2915CA57E9512D4460035BA107@qq.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Rong Tao
Alexei Starovoitov
parent
02baa0a2a6
commit
46f4ea04e0
3 changed files with 0 additions and 289 deletions
|
|
@ -13,7 +13,6 @@ tprogs-y += sockex1
|
|||
tprogs-y += sockex2
|
||||
tprogs-y += sockex3
|
||||
tprogs-y += tracex1
|
||||
tprogs-y += tracex2
|
||||
tprogs-y += tracex3
|
||||
tprogs-y += tracex4
|
||||
tprogs-y += tracex5
|
||||
|
|
@ -63,7 +62,6 @@ sockex1-objs := sockex1_user.o
|
|||
sockex2-objs := sockex2_user.o
|
||||
sockex3-objs := sockex3_user.o
|
||||
tracex1-objs := tracex1_user.o $(TRACE_HELPERS)
|
||||
tracex2-objs := tracex2_user.o
|
||||
tracex3-objs := tracex3_user.o
|
||||
tracex4-objs := tracex4_user.o
|
||||
tracex5-objs := tracex5_user.o $(TRACE_HELPERS)
|
||||
|
|
@ -105,7 +103,6 @@ always-y += sockex1_kern.o
|
|||
always-y += sockex2_kern.o
|
||||
always-y += sockex3_kern.o
|
||||
always-y += tracex1.bpf.o
|
||||
always-y += tracex2.bpf.o
|
||||
always-y += tracex3.bpf.o
|
||||
always-y += tracex4.bpf.o
|
||||
always-y += tracex5.bpf.o
|
||||
|
|
|
|||
|
|
@ -1,99 +0,0 @@
|
|||
/* Copyright (c) 2013-2015 PLUMgrid, http://plumgrid.com
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
#include "vmlinux.h"
|
||||
#include <linux/version.h>
|
||||
#include <bpf/bpf_helpers.h>
|
||||
#include <bpf/bpf_tracing.h>
|
||||
#include <bpf/bpf_core_read.h>
|
||||
|
||||
struct {
|
||||
__uint(type, BPF_MAP_TYPE_HASH);
|
||||
__type(key, long);
|
||||
__type(value, long);
|
||||
__uint(max_entries, 1024);
|
||||
} my_map SEC(".maps");
|
||||
|
||||
/* kprobe is NOT a stable ABI. If kernel internals change this bpf+kprobe
|
||||
* example will no longer be meaningful
|
||||
*/
|
||||
SEC("kprobe/kfree_skb_reason")
|
||||
int bpf_prog2(struct pt_regs *ctx)
|
||||
{
|
||||
long loc = 0;
|
||||
long init_val = 1;
|
||||
long *value;
|
||||
|
||||
/* read ip of kfree_skb_reason caller.
|
||||
* non-portable version of __builtin_return_address(0)
|
||||
*/
|
||||
BPF_KPROBE_READ_RET_IP(loc, ctx);
|
||||
|
||||
value = bpf_map_lookup_elem(&my_map, &loc);
|
||||
if (value)
|
||||
*value += 1;
|
||||
else
|
||||
bpf_map_update_elem(&my_map, &loc, &init_val, BPF_ANY);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static unsigned int log2(unsigned int v)
|
||||
{
|
||||
unsigned int r;
|
||||
unsigned int shift;
|
||||
|
||||
r = (v > 0xFFFF) << 4; v >>= r;
|
||||
shift = (v > 0xFF) << 3; v >>= shift; r |= shift;
|
||||
shift = (v > 0xF) << 2; v >>= shift; r |= shift;
|
||||
shift = (v > 0x3) << 1; v >>= shift; r |= shift;
|
||||
r |= (v >> 1);
|
||||
return r;
|
||||
}
|
||||
|
||||
static unsigned int log2l(unsigned long v)
|
||||
{
|
||||
unsigned int hi = v >> 32;
|
||||
if (hi)
|
||||
return log2(hi) + 32;
|
||||
else
|
||||
return log2(v);
|
||||
}
|
||||
|
||||
struct hist_key {
|
||||
char comm[16];
|
||||
u64 pid_tgid;
|
||||
u64 uid_gid;
|
||||
u64 index;
|
||||
};
|
||||
|
||||
struct {
|
||||
__uint(type, BPF_MAP_TYPE_PERCPU_HASH);
|
||||
__uint(key_size, sizeof(struct hist_key));
|
||||
__uint(value_size, sizeof(long));
|
||||
__uint(max_entries, 1024);
|
||||
} my_hist_map SEC(".maps");
|
||||
|
||||
SEC("ksyscall/write")
|
||||
int BPF_KSYSCALL(bpf_prog3, unsigned int fd, const char *buf, size_t count)
|
||||
{
|
||||
long init_val = 1;
|
||||
long *value;
|
||||
struct hist_key key;
|
||||
|
||||
key.index = log2l(count);
|
||||
key.pid_tgid = bpf_get_current_pid_tgid();
|
||||
key.uid_gid = bpf_get_current_uid_gid();
|
||||
bpf_get_current_comm(&key.comm, sizeof(key.comm));
|
||||
|
||||
value = bpf_map_lookup_elem(&my_hist_map, &key);
|
||||
if (value)
|
||||
__sync_fetch_and_add(value, 1);
|
||||
else
|
||||
bpf_map_update_elem(&my_hist_map, &key, &init_val, BPF_ANY);
|
||||
return 0;
|
||||
}
|
||||
char _license[] SEC("license") = "GPL";
|
||||
u32 _version SEC("version") = LINUX_VERSION_CODE;
|
||||
|
|
@ -1,187 +0,0 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
#include <stdio.h>
|
||||
#include <unistd.h>
|
||||
#include <stdlib.h>
|
||||
#include <signal.h>
|
||||
#include <string.h>
|
||||
|
||||
#include <bpf/bpf.h>
|
||||
#include <bpf/libbpf.h>
|
||||
#include "bpf_util.h"
|
||||
|
||||
#define MAX_INDEX 64
|
||||
#define MAX_STARS 38
|
||||
|
||||
/* my_map, my_hist_map */
|
||||
static int map_fd[2];
|
||||
|
||||
static void stars(char *str, long val, long max, int width)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < (width * val / max) - 1 && i < width - 1; i++)
|
||||
str[i] = '*';
|
||||
if (val > max)
|
||||
str[i - 1] = '+';
|
||||
str[i] = '\0';
|
||||
}
|
||||
|
||||
struct task {
|
||||
char comm[16];
|
||||
__u64 pid_tgid;
|
||||
__u64 uid_gid;
|
||||
};
|
||||
|
||||
struct hist_key {
|
||||
struct task t;
|
||||
__u32 index;
|
||||
};
|
||||
|
||||
#define SIZE sizeof(struct task)
|
||||
|
||||
static void print_hist_for_pid(int fd, void *task)
|
||||
{
|
||||
unsigned int nr_cpus = bpf_num_possible_cpus();
|
||||
struct hist_key key = {}, next_key;
|
||||
long values[nr_cpus];
|
||||
char starstr[MAX_STARS];
|
||||
long value;
|
||||
long data[MAX_INDEX] = {};
|
||||
int max_ind = -1;
|
||||
long max_value = 0;
|
||||
int i, ind;
|
||||
|
||||
while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
|
||||
if (memcmp(&next_key, task, SIZE)) {
|
||||
key = next_key;
|
||||
continue;
|
||||
}
|
||||
bpf_map_lookup_elem(fd, &next_key, values);
|
||||
value = 0;
|
||||
for (i = 0; i < nr_cpus; i++)
|
||||
value += values[i];
|
||||
ind = next_key.index;
|
||||
data[ind] = value;
|
||||
if (value && ind > max_ind)
|
||||
max_ind = ind;
|
||||
if (value > max_value)
|
||||
max_value = value;
|
||||
key = next_key;
|
||||
}
|
||||
|
||||
printf(" syscall write() stats\n");
|
||||
printf(" byte_size : count distribution\n");
|
||||
for (i = 1; i <= max_ind + 1; i++) {
|
||||
stars(starstr, data[i - 1], max_value, MAX_STARS);
|
||||
printf("%8ld -> %-8ld : %-8ld |%-*s|\n",
|
||||
(1l << i) >> 1, (1l << i) - 1, data[i - 1],
|
||||
MAX_STARS, starstr);
|
||||
}
|
||||
}
|
||||
|
||||
static void print_hist(int fd)
|
||||
{
|
||||
struct hist_key key = {}, next_key;
|
||||
static struct task tasks[1024];
|
||||
int task_cnt = 0;
|
||||
int i;
|
||||
|
||||
while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
|
||||
int found = 0;
|
||||
|
||||
for (i = 0; i < task_cnt; i++)
|
||||
if (memcmp(&tasks[i], &next_key, SIZE) == 0)
|
||||
found = 1;
|
||||
if (!found)
|
||||
memcpy(&tasks[task_cnt++], &next_key, SIZE);
|
||||
key = next_key;
|
||||
}
|
||||
|
||||
for (i = 0; i < task_cnt; i++) {
|
||||
printf("\npid %d cmd %s uid %d\n",
|
||||
(__u32) tasks[i].pid_tgid,
|
||||
tasks[i].comm,
|
||||
(__u32) tasks[i].uid_gid);
|
||||
print_hist_for_pid(fd, &tasks[i]);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
static void int_exit(int sig)
|
||||
{
|
||||
print_hist(map_fd[1]);
|
||||
exit(0);
|
||||
}
|
||||
|
||||
int main(int ac, char **argv)
|
||||
{
|
||||
long key, next_key, value;
|
||||
struct bpf_link *links[2];
|
||||
struct bpf_program *prog;
|
||||
struct bpf_object *obj;
|
||||
char filename[256];
|
||||
int i, j = 0;
|
||||
FILE *f;
|
||||
|
||||
snprintf(filename, sizeof(filename), "%s.bpf.o", argv[0]);
|
||||
obj = bpf_object__open_file(filename, NULL);
|
||||
if (libbpf_get_error(obj)) {
|
||||
fprintf(stderr, "ERROR: opening BPF object file failed\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* load BPF program */
|
||||
if (bpf_object__load(obj)) {
|
||||
fprintf(stderr, "ERROR: loading BPF object file failed\n");
|
||||
goto cleanup;
|
||||
}
|
||||
|
||||
map_fd[0] = bpf_object__find_map_fd_by_name(obj, "my_map");
|
||||
map_fd[1] = bpf_object__find_map_fd_by_name(obj, "my_hist_map");
|
||||
if (map_fd[0] < 0 || map_fd[1] < 0) {
|
||||
fprintf(stderr, "ERROR: finding a map in obj file failed\n");
|
||||
goto cleanup;
|
||||
}
|
||||
|
||||
signal(SIGINT, int_exit);
|
||||
signal(SIGTERM, int_exit);
|
||||
|
||||
/* start 'ping' in the background to have some kfree_skb_reason
|
||||
* events */
|
||||
f = popen("ping -4 -c5 localhost", "r");
|
||||
(void) f;
|
||||
|
||||
/* start 'dd' in the background to have plenty of 'write' syscalls */
|
||||
f = popen("dd if=/dev/zero of=/dev/null count=5000000", "r");
|
||||
(void) f;
|
||||
|
||||
bpf_object__for_each_program(prog, obj) {
|
||||
links[j] = bpf_program__attach(prog);
|
||||
if (libbpf_get_error(links[j])) {
|
||||
fprintf(stderr, "ERROR: bpf_program__attach failed\n");
|
||||
links[j] = NULL;
|
||||
goto cleanup;
|
||||
}
|
||||
j++;
|
||||
}
|
||||
|
||||
for (i = 0; i < 5; i++) {
|
||||
key = 0;
|
||||
while (bpf_map_get_next_key(map_fd[0], &key, &next_key) == 0) {
|
||||
bpf_map_lookup_elem(map_fd[0], &next_key, &value);
|
||||
printf("location 0x%lx count %ld\n", next_key, value);
|
||||
key = next_key;
|
||||
}
|
||||
if (key)
|
||||
printf("\n");
|
||||
sleep(1);
|
||||
}
|
||||
print_hist(map_fd[1]);
|
||||
|
||||
cleanup:
|
||||
for (j--; j >= 0; j--)
|
||||
bpf_link__destroy(links[j]);
|
||||
|
||||
bpf_object__close(obj);
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in a new issue