linux-kernel - Re: [patch 0/8] mm: memcg naturalization -rc2

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Date:	Mon, 13 Jun 2011 12:35:05 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Ying Han <yinghan@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Greg Thelen <gthelen@...gle.com>,
	Michel Lespinasse <walken@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 0/8] mm: memcg naturalization -rc2

On Mon, Jun 13, 2011 at 11:47:04AM +0200, Michal Hocko wrote:
> On Wed 01-06-11 08:25:11, Johannes Weiner wrote:
> > Hi,
> > 
> > this is the second version of the memcg naturalization series.  The
> > notable changes since the first submission are:
> > 
> >     o the hierarchy walk is now intermittent and will abort and
> >       remember the last scanned child after sc->nr_to_reclaim pages
> >       have been reclaimed during the walk in one zone (Rik)
> > 
> >     o the global lru lists are never scanned when memcg is enabled
> >       after #2 'memcg-aware global reclaim', which makes this patch
> >       self-sufficient and complete without requiring the per-memcg lru
> >       lists to be exclusive (Michal)
> > 
> >     o renamed sc->memcg and sc->current_memcg to sc->target_mem_cgroup
> >       and sc->mem_cgroup and fixed their documentation, I hope this is
> >       better understandable now (Rik)
> > 
> >     o the reclaim statistic counters have been renamed.  there is no
> >       more distinction between 'pgfree' and 'pgsteal', it is now
> >       'pgreclaim' in both cases; 'kswapd' has been replaced by
> >       'background'
> > 
> >     o fixed a nasty crash in the hierarchical soft limit check that
> >       happened during global reclaim in memcgs that are hierarchical
> >       but have no hierarchical parents themselves
> > 
> >     o properly implemented the memcg-aware unevictable page rescue
> >       scanner, there were several blatant bugs in there
> > 
> >     o documentation on new public interfaces
> > 
> > Thanks for your input on the first version.
> 
> I have finally got through the whole series, sorry that it took so long,
> and I have to say that I like it. There is just one issue I can see that
> was already discussed by you and Ying regarding further soft reclaim
> enhancement. I think it will be much better if that one comes as a
> separate patch though.

People have been arguing in both directions.  I share the sentiment
that that the soft limit rework is a separate thing, though, and will
make this series purely about the exclusive per-memcg lru lists.

Once this is done, the soft limit stuff should follow immediately.

> So thank you for this work and I am looking forward for a new version.
> I will try to give it some testing as well.

Thanks for your input and testing!
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