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#include <uapi/linux/ptrace.h> #include <linux/sched.h> struct key_t { u32 prev_pid; u32 curr_pid; }; BPF_HASH(stats, struct key_t, u64, 1024); int count_sched(struct pt_regs *ctx, struct task_struct *prev) { struct key_t key = {}; u64 zero = 0, *val; key.curr_pid = bpf_get_current_pid_tgid(); key.prev_pid = prev->pid; // could also use `stats.increment(key);` val = stats.lookup_or_try_init(&key, &zero); if (val) { (*val)++; } return 0; }