a.out-4609  [003]    50.323886: funcgraph_entry:                   |  tun_get_user() {
a.out-4609  [003]    50.323889: funcgraph_entry:                   |    sock_alloc_send_pskb() {
a.out-4609  [003]    50.323890: funcgraph_entry:                   |      alloc_skb_with_frags() {
a.out-4609  [003]    50.323890: funcgraph_entry:                   |        __alloc_skb() {
a.out-4609  [003]    50.323891: funcgraph_entry:                   |          kmem_cache_alloc_node() {
...
a.out-4609  [003]    50.324133: funcgraph_entry:                   |          kmalloc_reserve() {
...
a.out-4609  [003]    50.324155: funcgraph_entry:        0.730 us   |          __build_skb_around();
...
a.out-4609  [003]    50.324160: funcgraph_entry:        0.630 us   |    skb_put();
a.out-4609  [003]    50.324161: funcgraph_entry:                   |    skb_copy_datagram_from_iter() {
...
a.out-4609  [003]    50.324785: funcgraph_entry:        0.720 us   |    eth_type_trans();
a.out-4609  [003]    50.324786: funcgraph_entry:                   |    __skb_flow_dissect() {
a.out-4609  [003]    50.324787: funcgraph_entry:        0.620 us   |      __rcu_read_lock();
a.out-4609  [003]    50.324788: funcgraph_entry:        0.620 us   |      __rcu_read_unlock();
a.out-4609  [003]    50.324790: funcgraph_exit:         4.340 us   |    }
a.out-4609  [003]    50.324791: funcgraph_entry:        0.640 us   |    __local_bh_disable_ip();
a.out-4609  [003]    50.324793: funcgraph_entry:        0.660 us   |    __rcu_read_lock();
a.out-4609  [003]    50.324794: funcgraph_entry:                   |    do_xdp_generic() {
a.out-4609  [003]    50.324795: funcgraph_entry:                   |      pskb_expand_head() {
a.out-4609  [003]    50.324796: funcgraph_entry:                   |        kmalloc_reserve() {
a.out-4609  [003]    50.324796: funcgraph_entry:        0.610 us   |          kmalloc_size_roundup();
a.out-4609  [003]    50.324797: funcgraph_entry:                   |          __kmalloc_node_track_caller() {
a.out-4609  [003]    50.324798: funcgraph_entry:                   |            __kmalloc_large_node() {
a.out-4609  [003]    50.324799: funcgraph_entry:                   |              __alloc_pages() {
a.out-4609  [003]    50.324799: funcgraph_entry:        0.600 us   |                should_fail_alloc_page();
a.out-4609  [003]    50.324800: funcgraph_entry:                   |                get_page_from_freelist() {
a.out-4609  [003]    50.324801: funcgraph_entry:        0.640 us   |                  __zone_watermark_ok();
a.out-4609  [003]    50.324802: funcgraph_entry:                   |                  _raw_spin_lock_irqsave() {
a.out-4609  [003]    50.324803: funcgraph_entry:        0.600 us   |                    preempt_count_add();
a.out-4609  [003]    50.324804: funcgraph_exit:         1.810 us   |                  }
a.out-4609  [003]    50.324805: funcgraph_entry:        0.620 us   |                  __mod_zone_page_state();
a.out-4609  [003]    50.324806: funcgraph_entry:                   |                  _raw_spin_unlock_irqrestore() {
a.out-4609  [003]    50.324807: funcgraph_entry:        0.610 us   |                    preempt_count_sub();
a.out-4609  [003]    50.324808: funcgraph_exit:         1.800 us   |                  }
a.out-4609  [003]    50.324809: funcgraph_entry:                   |                  prep_new_page() {
a.out-4609  [003]    50.324811: funcgraph_entry:        1.040 us   |                    prep_compound_page();
a.out-4609  [003]    50.324812: funcgraph_exit:         3.560 us   |                  }
a.out-4609  [003]    50.324813: funcgraph_exit:       + 12.300 us  |                }
a.out-4609  [003]    50.324813: funcgraph_exit:       + 14.700 us  |              }
a.out-4609  [003]    50.324814: funcgraph_entry:        0.640 us   |              mod_node_page_state();
a.out-4609  [003]    50.324815: funcgraph_exit:       + 17.120 us  |            }
a.out-4609  [003]    50.324816: funcgraph_exit:       + 18.310 us  |          }
a.out-4609  [003]    50.324816: funcgraph_exit:       + 20.700 us  |        }
...
a.out-4609  [003]    50.324857: funcgraph_entry:                   |      bpf_prog_run_generic_xdp() {
a.out-4609  [003]    50.324858: funcgraph_entry:                   |        __bpf_prog_run32() {
a.out-4609  [003]    50.324858: funcgraph_entry:                   |          ___bpf_prog_run() {
a.out-4609  [003]    50.324859: funcgraph_entry:                   |            bpf_xdp_adjust_tail() {
a.out-4609  [003]    50.324860: funcgraph_entry:                   |              __warn_printk() {
a.out-4609  [003]    50.324861: funcgraph_entry:                   |                _printk() {