netdev - Re: [PATCH] mm: memcontrol: MEMCG no longer works with SLOB

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Message-ID: <1555665.xW941mUeCs@wuerfel>
Date:	Wed, 09 Dec 2015 22:03:06 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	netdev@...r.kernel.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Vladimir Davydov <vdavydov@...tuozzo.com>
Subject: Re: [PATCH] mm: memcontrol: MEMCG no longer works with SLOB

On Wednesday 09 December 2015 15:01:07 Johannes Weiner wrote:
> On Wed, Dec 09, 2015 at 05:32:39PM +0100, Arnd Bergmann wrote:
> > The change to move the kmem accounting into the normal memcg
> > code means we can no longer use memcg with slob, which lacks
> > the memcg_params member in its struct kmem_cache:
> > 
> > ../mm/slab.h: In function 'is_root_cache':
> > ../mm/slab.h:187:10: error: 'struct kmem_cache' has no member named 'memcg_params'
> > 
> > This enforces the new dependency in Kconfig. Alternatively,
> > we could change the slob code to allow using MEMCG.
> 
> I'm curious, was this a random config or do you actually use
> CONFIG_SLOB && CONFIG_MEMCG?

Just a randconfig build, I do a lot of those to check for ARM specific
regressions.
> index 5adec08..0b3ec4b 100644
> --- a/mm/slab.h
> +++ b/mm/slab.h
> @@ -25,6 +25,9 @@ struct kmem_cache {
>         int refcount;           /* Use counter */
>         void (*ctor)(void *);   /* Called on object slot creation */
>         struct list_head list;  /* List of all slab caches on the system */
> +#ifdef CONFIG_MEMCG
> +       struct memcg_cache_params memcg_params;
> +#endif
>  };
>  
>  #endif /* CONFIG_SLOB */

This was my first approach to the problem, and it solves the build issues,
I just wasn't sure if it works as expected.

	Arnd
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