1 // SPDX-License-Identifier: GPL-2.0 2 #include <vmlinux.h> 3 #include <bpf/bpf_tracing.h> 4 #include <bpf/bpf_helpers.h> 5 6 struct task_ls_map { 7 __uint(type, BPF_MAP_TYPE_TASK_STORAGE); 8 __uint(map_flags, BPF_F_NO_PREALLOC); 9 __type(key, int); 10 __type(value, int); 11 } task_ls_map SEC(".maps"); 12 13 long gp_seq; 14 15 SEC("syscall") 16 int do_call_rcu_tasks_trace(void *ctx) 17 { 18 struct task_struct *current; 19 int *v; 20 21 current = bpf_get_current_task_btf(); 22 v = bpf_task_storage_get(&task_ls_map, current, NULL, BPF_LOCAL_STORAGE_GET_F_CREATE); 23 if (!v) 24 return 1; 25 /* Invoke call_rcu_tasks_trace */ 26 return bpf_task_storage_delete(&task_ls_map, current); 27 } 28 29 SEC("kprobe/rcu_tasks_trace_postgp") 30 int rcu_tasks_trace_postgp(void *ctx) 31 { 32 __sync_add_and_fetch(&gp_seq, 1); 33 return 0; 34 } 35 36 char _license[] SEC("license") = "GPL"; 37