Bug#390184: [Pkg-sysvinit-devel] Bug#390184: initscripts: please limit the size of /lib/init/rw

[Petter Reinholdtsen]

[Mario Holbe]
> I personally think that something around 100k should suffice, but if
> you like to have it somehow dynamic, I attached a small sample patch
> which limits the size to one tenth of available memory.

Thank you for the patch.  If we want dosemu and user-mode-linux to
stop using /dev/shm/ to store their mmaped files, and instead use
/lib/init/rw/ or similar, the size will have to be a lot higher than
100k.

One idea I am considering is to make /dev/shm/ a symlink or bind-mount
to a subdirectory /lib/init/rw/shm/, and thus only have one tmpfs file
system by default.  I also consider modifying the RANLOCK and RANRUN
code to behave similarly, either symlink or bind-mount to
/lib/init/rw/.

> I moved the section which mounts /lib/init/rw down a bit to access
> /proc/meminfo.

I decided to mount it before /proc/, because we plan to modify mount
to use a file in /lib/init/rw/ instead of /etc/mtab to get rid of a
lot of complexity handling /etc/mtab.  I'm not sure if we want to move
it after /proc/ because of this.

Friendly,
-- 
Petter Reinholdtsen