linux-kernel - Re: [PATCH v3 11/16] memcg: destroy memcg caches

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Message-ID: <20120921202220.GO7264@google.com>
Date:	Fri, 21 Sep 2012 13:22:20 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Glauber Costa <glommer@...allels.com>
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	kamezawa.hiroyu@...fujitsu.com, devel@...nvz.org,
	linux-mm@...ck.org, Suleiman Souhlal <suleiman@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH v3 11/16] memcg: destroy memcg caches

Hello, Glauber.

On Tue, Sep 18, 2012 at 06:12:05PM +0400, Glauber Costa wrote:
> +static LIST_HEAD(destroyed_caches);
> +
> +static void kmem_cache_destroy_work_func(struct work_struct *w)
> +{
> +	struct kmem_cache *cachep;
> +	struct mem_cgroup_cache_params *p, *tmp;
> +	unsigned long flags;
> +	LIST_HEAD(del_unlocked);
> +
> +	spin_lock_irqsave(&cache_queue_lock, flags);
> +	list_for_each_entry_safe(p, tmp, &destroyed_caches, destroyed_list) {
> +		cachep = container_of(p, struct kmem_cache, memcg_params);
> +		list_move(&cachep->memcg_params.destroyed_list, &del_unlocked);
> +	}
> +	spin_unlock_irqrestore(&cache_queue_lock, flags);
> +
> +	list_for_each_entry_safe(p, tmp, &del_unlocked, destroyed_list) {
> +		cachep = container_of(p, struct kmem_cache, memcg_params);
> +		list_del(&cachep->memcg_params.destroyed_list);
> +		if (!atomic_read(&cachep->memcg_params.nr_pages)) {
> +			mem_cgroup_put(cachep->memcg_params.memcg);
> +			kmem_cache_destroy(cachep);
> +		}
> +	}
> +}
> +static DECLARE_WORK(kmem_cache_destroy_work, kmem_cache_destroy_work_func);

Again, please don't build your own worklist.  Just embed a work item
into mem_cgroup_cache_params and manipulate them.  No need to
duplicate what workqueue already implements.

Thanks.

-- 
tejun
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