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name : task_switch.c

 #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;
}

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