linux-kernel - Re: [PATCH 4/4] memcg: Document memory.low_limit_in

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Message-ID: <20140502094622.GE3446@dhcp22.suse.cz>
Date:	Fri, 2 May 2014 11:46:22 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Greg Thelen <gthelen@...gle.com>,
	Michel Lespinasse <walken@...gle.com>,
	Tejun Heo <tj@...nel.org>, Hugh Dickins <hughd@...gle.com>,
	Roman Gushchin <klamm@...dex-team.ru>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH 4/4] memcg: Document memory.low_limit_in_bytes

On Wed 30-04-14 18:57:48, Johannes Weiner wrote:
> On Mon, Apr 28, 2014 at 02:26:45PM +0200, Michal Hocko wrote:
> > Describe low_limit_in_bytes and its effect.
> > 
> > Signed-off-by: Michal Hocko <mhocko@...e.cz>
> > ---
> >  Documentation/cgroups/memory.txt | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> > 
> > diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
> > index add1be001416..a52913fe96fb 100644
> > --- a/Documentation/cgroups/memory.txt
> > +++ b/Documentation/cgroups/memory.txt
> > @@ -57,6 +57,7 @@ Brief summary of control files.
> >   memory.memsw.usage_in_bytes	 # show current res_counter usage for memory+Swap
> >  				 (See 5.5 for details)
> >   memory.limit_in_bytes		 # set/show limit of memory usage
> > + memory.low_limit_in_bytes	 # set/show low limit for memory reclaim
> >   memory.memsw.limit_in_bytes	 # set/show limit of memory+Swap usage
> >   memory.failcnt			 # show the number of memory usage hits limits
> >   memory.memsw.failcnt		 # show the number of memory+Swap hits limits
> > @@ -249,6 +250,14 @@ is the objective of the reclaim. The global reclaim aims at balancing
> >  zones' watermarks while the limit reclaim frees some memory to allow new
> >  charges.
> >  
> > +Groups might be also protected from both global and limit reclaim by
> > +low_limit_in_bytes knob. If the limit is non-zero the reclaim logic
> > +doesn't include groups (and their subgroups - see 6. Hierarchy support)
> > +which are bellow the low limit if there is other eligible cgroup in the
> 
> 'below' :-) Although I really like that spello.

ups
-- 
Michal Hocko
SUSE Labs
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