1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (C) 2023 Chuyi Zhou <zhouchuyi@bytedance.com> */ 3 4 #include "vmlinux.h" 5 #include <bpf/bpf_helpers.h> 6 #include <bpf/bpf_tracing.h> 7 #include "bpf_misc.h" 8 #include "bpf_experimental.h" 9 10 char _license[] SEC("license") = "GPL"; 11 12 pid_t target_pid; 13 int procs_cnt, threads_cnt, proc_threads_cnt; 14 15 void bpf_rcu_read_lock(void) __ksym; 16 void bpf_rcu_read_unlock(void) __ksym; 17 18 SEC("fentry.s/" SYS_PREFIX "sys_getpgid") 19 int iter_task_for_each_sleep(void *ctx) 20 { 21 struct task_struct *cur_task = bpf_get_current_task_btf(); 22 struct task_struct *pos; 23 24 if (cur_task->pid != target_pid) 25 return 0; 26 procs_cnt = threads_cnt = proc_threads_cnt = 0; 27 28 bpf_rcu_read_lock(); 29 bpf_for_each(task, pos, NULL, BPF_TASK_ITER_ALL_PROCS) 30 if (pos->pid == target_pid) 31 procs_cnt++; 32 33 bpf_for_each(task, pos, cur_task, BPF_TASK_ITER_PROC_THREADS) 34 proc_threads_cnt++; 35 36 bpf_for_each(task, pos, NULL, BPF_TASK_ITER_ALL_THREADS) 37 if (pos->tgid == target_pid) 38 threads_cnt++; 39 bpf_rcu_read_unlock(); 40 return 0; 41 } 42