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SubjectRe: [RFC][PATCH] memcg soft limit (yet another new design) v1
On Sat, 28 Mar 2009 23:41:00 +0530
Balbir Singh <balbir@linux.vnet.ibm.com> wrote:

> * KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> [2009-03-27 13:59:33]:
>
> > ==brief test result==
> > On 2CPU/1.6GB bytes machine. create group A and B
> > A. soft limit=300M
> > B. no soft limit
> >
> > Run a malloc() program on B and allcoate 1G of memory. The program just
> > sleeps after allocating memory and no memory refernce after it.
> > Run make -j 6 and compile the kernel.
> >
> > When vm.swappiness = 60 => 60MB of memory are swapped out from B.
> > When vm.swappiness = 10 => 1MB of memory are swapped out from B
> >
> > If no soft limit, 350MB of swap out will happen from B.(swapiness=60)
> >
>
> I ran the same tests, booted the machine with mem=1700M and maxcpus=2
>
with your patch ?

> Here is what I see with
>
> A has a swapout of 344M and B has not swapout at all, since B is
> always under its soft limit. vm.swappiness is set to 60
>
> I think the above is more along the lines of the expected functional behaviour.
>

yes. but it's depend on workload (and fortune?) of A in this implementation.
Follwing is what I think now. We need some changes to vmscanc, later.

explain)
This patch rotate memcg's page to the top of LRU. But, LRU is divided into
INACTIVE/ACTIVE. So, sometimes, memcg's INACTIVE LRU can be empty and
pages from other group can be reclaimed.
In my test, group A's RSS usage can be 1-2M sometimes.

Thanks,
-Kame









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