linux-kernel - Re: [PATCH 6/6] memcg: HARDWALL hierarchy

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Date:	Tue, 24 Jun 2008 12:37:15 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"menage@...gle.com" <menage@...gle.com>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"xemul@...nvz.org" <xemul@...nvz.org>,
	"yamamoto@...inux.co.jp" <yamamoto@...inux.co.jp>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>
Subject: Re: [PATCH 6/6] memcg: HARDWALL hierarchy



On Mon, 23 Jun 2008 15:29:41 -0700
Randy Dunlap <randy.dunlap@...cle.com> wrote:

> On Fri, 13 Jun 2008 18:37:41 +0900 KAMEZAWA Hiroyuki wrote:
> 
> > Support hardwall hierarchy (and no-hierarchy) in memcg.
> > 
> > Change log: v3->v4
> >  - cut out from memcg hierarchy patch set v4.
> >  - no major changes, but some amount of functions are moved to res_counter.
> >    and be more gneric.
> > 
> > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> > 
> > ---
> >  Documentation/controllers/memory.txt |   57 +++++++++++++++++++++++++++++-
> >  mm/memcontrol.c                      |   65 +++++++++++++++++++++++++++++++++--
> >  2 files changed, 118 insertions(+), 4 deletions(-)
> > 
> > Index: linux-2.6.26-rc5-mm3/Documentation/controllers/memory.txt
> > ===================================================================
> > --- linux-2.6.26-rc5-mm3.orig/Documentation/controllers/memory.txt
> > +++ linux-2.6.26-rc5-mm3/Documentation/controllers/memory.txt
> > @@ -154,7 +154,7 @@ The memory controller uses the following
> >  
> >  0. Configuration
> 
> I apologize if you have already corrected these.  I'm a bit behind
> on doc reviews.
> 
Thank you for all your help. I'll check my set again especially
's' and 'a/an'.


> 
> > -a. Enable CONFIG_CGROUPS
> > +a. Enable CONFESS_CGROUPS
> 
> Really?  Looks odd and backwards.
> 
my mistake..

Thanks,
-Kame

> >  b. Enable CONFIG_RESOURCE_COUNTERS
> >  c. Enable CONFIG_CGROUP_MEM_RES_CTLR
> >  
> > @@ -237,7 +237,58 @@ cgroup might have some charge associated
> >  tasks have migrated away from it. Such charges are automatically dropped at
> >  rmdir() if there are no tasks.
> >  
> > -5. TODO
> > +5. Supported Hierarchy Model
> > +
> > +Currently, memory controller supports following models of hierarchy in the
> > +kernel. (see also resource_counter.txt)
> > +
> > +2 files are related to hierarchy.
> > + - memory.hierarchy_model
> > + - memory.for_children
> > +
> > +Basic Rule.
> > +  - Hierarchy can be set per cgroup.
> > +  - A child inherits parent's hierarchy model at creation.
> > +  - A child can change its hierarchy only when the parent's hierarchy is
> > +    NO_HIERARCY and it has no children.
> 
>        NO_HIERARCHY
> 
sure

> > +
> > +
> > +5.1. NO_HIERARCHY
> > +  - Each cgroup is independent from other ones.
> > +  - When memory.hierarchy_model is 0, NO_HIERARCHY is used.
> > +    Under this model, there is no controls based on tree of cgroups.
> 
> 	                 there are no controls
> 
Oh, thanks.

> > +    This is the default model of root cgroup.
> > +
> > +5.2 HARDWALL_HIERARCHY
> > +  - A child is a isolated portion of the parent.
> 
>                is an
> 
> > +  - When memory.hierarchy_model is 1, HARDWALL_HIERARCHY is used.
> > +    In this model a child's limit is charged as parent's usage.
> > +
> > +  Hard-Wall Hierarchy Example)
> 
> Drop ')'.
> 
> > +  1) Assume a cgroup with 1GB limits. (and no tasks belongs to this, now)
> > +     - group_A limit=1G,usage=0M.
> 
> 	                  , usage=0M.
> 
> > +
> > +  2) create group B, C under A.
> > +     - group A limit=1G, usage=0M, for_childre=0M
> 
> 	                              for_children=0M
> 
> > +          - group B limit=0M, usage=0M.
> > +          - group C limit=0M, usage=0M.
> > +
> > +  3) increase group B's limit to 300M.
> > +     - group A limit=1G, usage=300M, for_children=300M
> > +          - group B limit=300M, usage=0M.
> > +          - group C limit=0M, usage=0M.
> > +
> > +  4) increase group C's limit to 500M
> > +     - group A limit=1G, usage=800M, for_children=800M
> > +          - group B limit=300M, usage=0M.
> > +          - group C limit=500M, usage=0M.
> > +
> > +  5) reduce group B's limit to 100M
> > +     - group A limit=1G, usage=600M, for_children=600M.
> > +          - group B limit=100M, usage=0M.
> > +          - group C limit=500M, usage=0M.
> 
> 
> ---
> ~Randy
> Linux Plumbers Conference, 17-19 September 2008, Portland, Oregon USA
> http://linuxplumbersconf.org/
> 

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