Trace function graph after a page fault

JOURNAL.md

@@ -1113,3 +1113,4 @@ and then begins filling it, printing the progress in the output.
     written=53248K, addr=0x3f9ec00020 OK
     written=57344K, addr=0x3f9f000020 OK
 
+Let's see if we can trace the page fault.

lagarto-ox.nix

@@ -88,6 +88,14 @@
 
         export PATH=${config.system.build.extraUtils}/bin
 
+        mkdir -p /sys/kernel/debug/
+        mount -t debugfs none /sys/kernel/debug/
+        td=/sys/kernel/debug/tracing
+        echo nop > $td/current_tracer
+        echo 100 > $td/max_graph_depth
+        echo do_page_fault > $td/set_graph_function
+        echo function_graph > $td/current_tracer
+
         #memtool chain $((512 * 1024))
         memtool fill $((512 * 1024 * 1024))