linux-kernel - Re: [RFC][PATCH] memcg soft limit (yet another new design) v1

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20090331085451.ce6a5147.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 31 Mar 2009 08:54:51 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>
Subject: Re: [RFC][PATCH] memcg soft limit (yet another new design) v1

On Sat, 28 Mar 2009 23:41:00 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> * KAMEZAWA Hiroyuki <kamezawa.hiroyu@...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
    






--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/