[dm-devel] Re: [Q] don't allow tmpfs to page out

Arjan van de Ven arjanv at redhat.com
Thu Jul 15 08:00:17 UTC 2004

On Thu, Jul 15, 2004 at 09:58:37AM +0200, christophe.varoqui at free.fr wrote:
> > 
> > just do 
> > mount -t ramfs none /mnt/point
> > 
> Would that be a suitable solution to store callout binaries for daemons like
> multipathd that need to work in case of system-disk outage (/bin & swap on SAN
> for example) ?

somewhat, as long as ALL requirements are there, including all libraries ;)

> If so, is it possible and/or correct for the daemon to do a private ramfs mount
> for this purpose ?

sure; namespaces can do a LOT
> And while I'm at throwing all the questions I have on my mind :
> * how can I disable on-demand loading for the daemon ?
> * does mlockall() provides all the necessary garanties ?

mlockall does not guarantee that syscalls you do don't cause memory
allocations, nor does the ramfs approach.
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