Re: [PATCH 0/5] Memory controller soft limit patches (v7)

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

On Mon, 23 Mar 2009 10:52:47 +0530
Balbir Singh <balbir@linux.vnet.ibm.com> wrote:

> > please add text to explain the behaior, what happens in the following situation.
> > 
> > 
> >    /group_A .....softlimit=100M usage=ANON=1G,FILE=1M
> >    /group_B .....softlimit=200M usage=ANON=1G,FILE=1M
> >    /group_C .....softlimit=300M
> >    on swap-available/swap-less/swap-full system.
> > 
> >   And Run run "dd" or "cp" of big files under group_C.
> 
> That depends on the memory on the system, on my system with 4G, things
> run just fine.
> 
fine ?

> I tried the following
> 
>         /group_A soft_limit=100M, needed memory=3200M (allocate and touch)
>         /group_B soft_limit=200M, needed memory=3200M
>         /group_C soft_limit=300M, needed memory=1024M (dd in a while loop)
> 
> group_B and group_A had a difference of 200M in their allocations on
> average. group_C touched 800M as maximum usage in bytes and around
> 500M on the average.
> 
> With swap turned off
> 
> group_C was hit the most with a lot of reclaim taking place on it.
> group_A was OOM killed and immediately after group_B got all the
> memory it needed and completed successfully.

Hmm ? OOM-Kill seems to happen without "dd" in group C...

Thanks,
-Kame

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