Disable proactive compation

I see a lot of kcompactd0 entries in sched_switch log, so disable it for
now.

lagarto-ox.nix

@@ -89,6 +89,11 @@
         sh -c 'hb=0; while [ 1 ]; do let hb=$hb+1; devmem 0x1bfff0000 32 $hb; done' &
       ''
       +
+      # Disable proactive compaction. May be better to disable CONFIG_COMPACTION.
+      ''
+        echo 0 > /proc/sys/vm/compaction_proactiveness
+      ''
+      +
       # Exclude the second pid, which is the kthread that will dump the trace to
       # the console, otherwise we live lock the kernel. Then enable the
       # sched_switch events.