[Devel] Re: Supporting overcommit with the memory controller

[KAMEZAWA Hiroyuki]

On Thu, 06 Mar 2008 11:55:47 +0300
Pavel Emelyanov <xemul at openvz.org> wrote:

> >>  Can Balbir's soft-limit patches help ?
> 
> [snip]
> 
> > 
> > Yes, that could be a useful part of the solution - I suspect we'd need
> > to have kswapd do the soft-limit push back as well as in
> > try_to_free_pages(), to avoid the high-priority jobs getting stuck in
> > the reclaim code. It would also be nice if we had:
> 
> BTW, one of the way OpenVZ users determine how much memory they
> need for containers is the following: they set the limits to
> maximal values and then check the "maxheld" (i.e. the maximal level
> of consumption over the time) value.
> 
> Currently, we don't have such in res_counters and I'm going to
> implement this. Objections?
> 
Basically, no objection.

BTW, which does it means ? 
- create a new cgroup to accounting max memory consumption, etc...
or
- add new member to mem_cgroup
or
- add new member to res_counter

Thanks,
-Kame

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