Re: [patch] mm, memcg: do not allow tasks to be attached with zero limit

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On Thu, 8 Mar 2012 12:29:51 -0800
Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:

> On Wed, 7 Mar 2012 19:14:49 -0800 (PST)
> David Rientjes <rientjes@xxxxxxxxxx> wrote:
> 
> > This patch prevents tasks from being attached to a memcg if there is a
> > hard limit of zero.
> 
> We're talking about the memcg's limit_in_bytes here, yes?
> 
> > Additionally, the hard limit may not be changed to
> > zero if there are tasks attached.
> 
> hm, well...  why?  That would be user error, wouldn't it?  What is
> special about limit_in_bytes=0?  The memcg will also be unviable if
> limit_in_bytes=1, but we permit that.
> 
> IOW, confused.
> 
Ah, yes. limit_in_bytes < some small size can cause the same trouble.
Hmm... should we have configurable min_limit_in_bytes as sysctl or root memcg's
attaribute.. ?

-Kame

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