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

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Date:	Mon, 23 Jun 2014 11:30:52 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
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 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

-- 
Michal Hocko
SUSE Labs
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