Re: ramdisk/tmpfs/ramfs/memfs ?

[Christoph Rohland <cr@sap.com>]

Hi Padraig,

On Thu, 26 Apr 2001, Padraig Brady wrote:
> 2. Is tmpfs is basically swap and /tmp together in a ramdisk?
>    The advantage being you need to reserve less RAM for both
>    together than seperately?

tmpfs is ramfs+swap+limits. It is not using ramdisks and is not
related to them.

> 3. If I've no backing store (harddisk?) is there any advantage 
>    of using tmpfs instead of ramfs? Also does tmpfs need a 
>    backing store?

Probably yes, since you spare a little bit kernel memory. most of
tmpfs is unconditionally in the kernel for shared mappings. So the
actual CONFIG_TMPFS only adds some small functions to the kernel to
export this to usre space.

Greetings
		Christoph