[Lxc-users] total RAM limit

[Gary Ballantyne]

On Fri, 1 Feb 2013 10:24:13 -0600
Serge Hallyn <serge.hallyn at canonical.com> wrote:

> 
> Did you actually test with a memory hog program? I just noticed there
> appears to be a bug in that if I
> 
> 	d=/sys/fs/cgroup/memory/a
> 	mkdir $d
> 	echo 1 > $d/memory.use_hierarchy
> 	echo 5000 > $d/memory.limit_in_bytes
> 	mkdir $d/b
> 
> then $d/b/memory.limit_in_bytes does not report the reduced limit.  However
> whenI run a program which does char *c = malloc(10000) after doing
> 	echo $$ > $d/b/tasks
> 
> then I get killed by OOM.
> 
> -serge

I tested with a large array in ipython. Though, from your example, it seems I'm missing memory.use_hierarchy.

In principle, it seems like I need something like:

echo 1 > /sys/fs/cgroup/memory/lxc/memory.use_hierarchy

But, I can't do that before the container is started (no lxc directory) or after it is started (device busy).