linux-kernel - Re: [PATCH 7/9] slab: introduce __kmemcg_cache

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Message-ID: <20170114134211.GF2668@esperanza>
Date:   Sat, 14 Jan 2017 16:42:11 +0300
From:   Vladimir Davydov <vdavydov@...antool.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     cl@...ux.com, penberg@...nel.org, rientjes@...gle.com,
        iamjoonsoo.kim@....com, akpm@...ux-foundation.org, jsvana@...com,
        hannes@...xchg.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, cgroups@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH 7/9] slab: introduce __kmemcg_cache_deactivate()

On Sat, Jan 14, 2017 at 12:54:47AM -0500, Tejun Heo wrote:
> __kmem_cache_shrink() is called with %true @deactivate only for memcg
> caches.  Remove @deactivate from __kmem_cache_shrink() and introduce
> __kmemcg_cache_deactivate() instead.  Each memcg-supporting allocator
> should implement it and it should deactivate and drain the cache.
> 
> This is to allow memcg cache deactivation behavior to further deviate
> from simple shrinking without messing up __kmem_cache_shrink().
> 
> This is pure reorganization and doesn't introduce any observable
> behavior changes.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Vladimir Davydov <vdavydov.dev@...il.com>
> Cc: Christoph Lameter <cl@...ux.com>
> Cc: Pekka Enberg <penberg@...nel.org>
> Cc: David Rientjes <rientjes@...gle.com>
> Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>

Acked-by: Vladimir Davydov <vdavydov.dev@...il.com>

...
> diff --git a/mm/slab.h b/mm/slab.h
> index 8f47a44..73ed6b5 100644
> --- a/mm/slab.h
> +++ b/mm/slab.h
> @@ -164,7 +164,10 @@ static inline unsigned long kmem_cache_flags(unsigned long object_size,
>  
>  int __kmem_cache_shutdown(struct kmem_cache *);
>  void __kmem_cache_release(struct kmem_cache *);
> -int __kmem_cache_shrink(struct kmem_cache *, bool);
> +int __kmem_cache_shrink(struct kmem_cache *);
> +#if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
> +void __kmemcg_cache_deactivate(struct kmem_cache *s);
> +#endif

nit: ifdef is not necessary