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SubjectRe: [RFC][PATCH 3/3] memcg documenation soft limit (Yet Another One)
On Fri, 06 Mar 2009 08:47:31 -0800
Randy Dunlap <randy.dunlap@oracle.com> wrote:

> KAMEZAWA Hiroyuki wrote:
> > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

Thank you. (and sorry
-Kame

> >
> > Documentation for softlimit (3/3)
> >
> > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> > ---
> > Documentation/cgroups/memory.txt | 19 +++++++++++++++++++
> > 1 file changed, 19 insertions(+)
> >
> > Index: mmotm-2.6.29-Mar3/Documentation/cgroups/memory.txt
> > ===================================================================
> > --- mmotm-2.6.29-Mar3.orig/Documentation/cgroups/memory.txt
> > +++ mmotm-2.6.29-Mar3/Documentation/cgroups/memory.txt
> > @@ -322,6 +322,25 @@ will be charged as a new owner of it.
> > - a cgroup which uses hierarchy and it has child cgroup.
> > - a cgroup which uses hierarchy and not the root of hierarchy.
> >
> > +5.4 softlimit
> > + Memory cgroup supports softlimit and has 2 params for control.
>
> parameters
>
> > + - memory.softlimit_in_bytes
> > + - softlimit to this cgroup.
> softlimit for this cgroup
> (i.e., no beginning '-' and no ending '.')
>
>
> > + - memory.softlimit_priority.
> > + - priority of this cgroup at softlimit reclaim.
> priority of this cgroup at softlimit reclaim
>
> > + Allowed priority level is 3-0 and 3 is the lowest.
>
> Not very user friendly...
>
> > + If 0, this cgroup will not be target of softlimit.
> > +
> > + At memory shortage of the system (or local node/zone), softlimit helps
> > + kswapd(), a global memory recalim kernel thread, and inform victim cgroup
>
> reclaim informs
>
> > + to be shrinked to kswapd.
> > +
> > + Victim selection logic:
> > + The kernel searches from the lowest priroty(3) up to the highest(1).
>
> priority 0 ?? (from above)
>
> > + If it find a cgroup witch has memory larger than softlimit, steal memory
>
> finds which
>
> > + from it.
> > + If multiple cgroups are on the same priority, each cgroup wil be a
>
> will
>
> > + victim in turn.
> >
> > 6. Hierarchy support
>
>
> --
> ~Randy
>



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