bpf fentry/fexit programs - which added in 5.11 I think this is a pretty reasonable trade off if you read theman pageofbpf_perf_event_read_value If youreallywant 5.4 then we can discuss that as it's not trivial.
BPF_PROG_TYPE_PERF_EVENT: BPF_FUNC_perf_event_output() BPF_FUNC_get_stackid() BPF_FUNC_get_stack() BPF_FUNC_perf_prog_read_value() Tracing functions 6. cgroup套接字程序 该程序允许cgroup在其包含的进程中控制网络流量。在传入cgroup控制之前,通过cgroup套接字程序,可以决定如何处理这些数据包。ci...
static void check_on_cpu(int cpu, struct perf_event_attr *attr) { struct bpf_perf_event_value value2; int pmu_fd, error = 0; cpu_set_t set; __u64 value; Expand All @@ -46,8 +47,18 @@ static void check_on_cpu(int cpu, struct perf_event_attr *attr) fprintf(stderr, "Va...
event="kfree_skb"指定了kprobe挂载的内核函数为kfree_skb; fn_name="trace_kfree_skb"指定了当检测到内核函数kfree_skb时,执行程序中的trace_kfree_skb函数; BPF程序的第一个参数总为ctx,该参数称为上下文,提供了访问内核正在处理的信息,依赖于正在运行的BPF程序的类型。CPU将内核正在执行任务的不同信息保存...
BPF_MAP_TYPE_PERF_EVENT_AYYAY:Perf事件数组映射,该映射将perf_events数据存储在环形缓存区,用于BPF程序和用户空间程序进行实时通信。其可以将内核跟踪工具发出的事件转发给用户空间程序,使很多可观测工具的基础。 BPF_MAP_TYPE_PERCUP_HASH:哈希表映射的改进版本,我们可以将此哈希表分配给单个独立的CPU(每个CPU都有...
bpf_probe_read_str, bpf_perf_event_read_value, bpf_override_return, bpf_get_stack, bpf_get_current_cgroup_id, bpf_map_push_elem, bpf_map_pop_elem, bpf_map_peek_elem, bpf_send_signal, bpf_probe_read_user, bpf_probe_read_kernel, bpf_probe_read_user_str, bpf_probe_read_ker...
(LIBBPF_STRICT_ALL);libbpf_set_print(libbpf_print_fn);obj=solisten_bpf__open();obj->rodata->target_pid=target_pid;err=solisten_bpf__load(obj);err=solisten_bpf__attach(obj);pb=perf_buffer__new(bpf_map__fd(obj->maps.events),PERF_BUFFER_PAGES,handle_event,handle_lost_events,NULL,...
BPF_MAP_TYPE_PERF_EVENT_ARRAY, BPF_MAP_TYPE_PERCPU_HASH, BPF_MAP_TYPE_PERCPU_ARRAY, BPF_MAP_TYPE_STACK_TRACE, BPF_MAP_TYPE_CGROUP_ARRAY, BPF_MAP_TYPE_LRU_HASH, BPF_MAP_TYPE_LRU_PERCPU_HASH, }; key_size指定了key的数据大小,用于在后续验证bpf程序时使用,防止越界访问。例如当 一个map创...
(key,u32);__type(value,struct args_t);}startSEC(".maps");struct{__uint(type,BPF_MAP_TYPE_PERF_EVENT_ARRAY);__uint(key_size,sizeof(u32));__uint(value_size,sizeof(u32));}eventsSEC(".maps");static__always_inline boolvalid_uid(uid_t uid){returnuid!=INVALID_UID;}static__...
(data.comm)); events.perf_submit(ctx, &data, sizeof(data)); } """ # initialize BPF b = BPF(text=bpf_text) b.attach_kprobe(event=function, fn_name="trace_stack") TASK_COMM_LEN = 16 # linux/sched.h matched = b.num_open_kprobes() # 判断输入的 function 是否合法 if matched =...