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SubjectRe: 2.4.23 + tmpfs: where's my mem?!
Good morning, Alexandre,

On Thu, 11 Dec 2003, Willy Tarreau wrote:

> On Thu, Dec 11, 2003 at 10:54:28AM -0200, dual_bereta_r0x wrote:
> > root@hquest:/tmp# cat /etc/slackware-version
> > Slackware 9.1.0
> > root@hquest:/tmp# uname -a
> > Linux hquest 2.4.23 #6 Sat Nov 29 22:47:03 PST 2003 i686 unknown unknown
> > GNU/Linux
> > root@hquest:/tmp# df /tmp
> > Filesystem 1K-blocks Used Available Use% Mounted on
> > tmpfs 124024 112388 11636 91% /tmp
> > root@hquest:/tmp# du -s .
> > 32 .
> > root@hquest:/tmp# _
>
> maybe you have a process which creates a temporary file in /tmp, and deletes
> the entry while keeping the fd open. vmware 1.2 did that, and probably more
> recent ones still do. It's a very clever way to automatically remove temp
> files when the process terminates.

Agreed - very likely. User-Mode Linux does the same for its UML
memory images.
To see what process is doing this, try looking at:

ls -Al /proc/[0-9]*/fd/* | grep ' /tmp/'

Which will show you all open files in /tmp, deleted or not.

lr-x------ 1 wstearns wstearns 64 Dec 11 10:23 /proc/10370/fd/6 -> /tmp/sfs8eEBBc (deleted)

The pid following /proc/ (10370 in this case) is the process
holding this file open.
Cheers,
- Bill

---------------------------------------------------------------------------
"Any sufficiently advanced technology is indistinguishable from
magic."
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William Stearns (wstearns@pobox.com). Mason, Buildkernel, freedups, p0f,
rsync-backup, ssh-keyinstall, dns-check, more at: http://www.stearns.org
Linux articles at: http://www.opensourcedigest.com
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