assigning write permission to /proc/sys/vm

assigning write permission to /proc/sys/vm

I asked my sysadmin if he can do the following:
echo 0 > /proc/sys/vm/zone_reclaim_mode
He came back to me saying that he doesn't have the necessary permissions
(as root) to create a file in that directory and that directory doesn't
have write permissions (only has xr) and also that he cannot change the
permissions.
How can we add write permissions to that directory and create the required
file?
Thank you in advance.