selftests/bpf: Call bpf_get_numa_node_id() in trigger_count()

The bench test "trig-kernel-count" can be used as a baseline comparison
for fentry and other benchmarks, and the calling to bpf_get_numa_node_id()
should be considered as composition of the baseline. So, let's call it in
trigger_count(). Meanwhile, rename trigger_count() to
trigger_kernel_count() to make it easier understand.

Signed-off-by: Menglong Dong <[e-mail]>
Signed-off-by: Andrii Nakryiko <[e-mail]>
Link: https://lore.kernel.org/bpf/[e-mail]

tools/testing/selftests/bpf/benchs/bench_trigger.c

···
 {
 	setup_ctx();
 	bpf_program__set_autoload(ctx.skel->progs.trigger_driver, false);
-	bpf_program__set_autoload(ctx.skel->progs.trigger_count, true);
+	bpf_program__set_autoload(ctx.skel->progs.trigger_kernel_count, true);
 	load_ctx();
 	/* override driver program */
-	ctx.driver_prog_fd = bpf_program__fd(ctx.skel->progs.trigger_count);
+	ctx.driver_prog_fd = bpf_program__fd(ctx.skel->progs.trigger_kernel_count);
 }
 
 static void trigger_kprobe_setup(void)

tools/testing/selftests/bpf/progs/trigger_bench.c

···
 const volatile int batch_iters = 0;
 
 SEC("?raw_tp")
-int trigger_count(void *ctx)
+int trigger_kernel_count(void *ctx)
 {
 	int i;
 
-	for (i = 0; i < batch_iters; i++)
+	for (i = 0; i < batch_iters; i++) {
 		inc_counter();
+		bpf_get_numa_node_id();
+	}
 
 	return 0;
 }