linux-kernel - Re: [patch 12/13] mm: memcontrol: rewrite charge API

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Message-ID: <20140623094203.GG14781@pengutronix.de>
Date:	Mon, 23 Jun 2014 11:42:03 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, Tejun Heo <tj@...nel.org>,
	Vladimir Davydov <vdavydov@...allels.com>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel@...gutronix.de
Subject: Re: [patch 12/13] mm: memcontrol: rewrite charge API

On Mon, Jun 23, 2014 at 11:30:52AM +0200, Michal Hocko wrote:
> On Mon 23-06-14 08:15:26, Uwe Kleine-König wrote:
> > Hello,
> > 
> > On Wed, Jun 18, 2014 at 04:40:44PM -0400, Johannes Weiner wrote:
> > > The memcg charge API charges pages before they are rmapped - i.e. have
> > > an actual "type" - and so every callsite needs its own set of charge
> > > and uncharge functions to know what type is being operated on.  Worse,
> > > uncharge has to happen from a context that is still type-specific,
> > > rather than at the end of the page's lifetime with exclusive access,
> > > and so requires a lot of synchronization.
> > > ...
> > 
> > this patch made it into next-20140623 as 5e49555277df (mm: memcontrol: rewrite
> > charge API) and it makes efm32_defconfig (ARCH=arm) fail with:
> > 
> >   CC      mm/swap.o
> > mm/swap.c: In function 'lru_cache_add_active_or_unevictable':
> > mm/swap.c:719:2: error: implicit declaration of function 'TestSetPageMlocked' [-Werror=implicit-function-declaration]
> >   if (!TestSetPageMlocked(page)) {
> >   ^
> > cc1: some warnings being treated as errors
> > scripts/Makefile.build:257: recipe for target 'mm/swap.o' failed
> > make[3]: *** [mm/swap.o] Error 1
> > Makefile:1471: recipe for target 'mm/swap.o' failed
> > 
> > imx_v4_v5_defconfig works, so probably the thing that makes
> > efm32_defconfig fail is CONFIG_MMU=n.
> 
> Fix is here:
> http://marc.info/?l=linux-mm&m=140330132521104
Thanks for the link.

I have another problem that makes my machine fail to boot but at least
this patch makes next compilable again for me.

Thanks
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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