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Date: Wed, 30 May 2012 17:37:57 +0400 From: Glauber Costa <glommer@...allels.com> To: Frederic Weisbecker <fweisbec@...il.com> CC: <linux-kernel@...r.kernel.org>, <cgroups@...r.kernel.org>, <linux-mm@...ck.org>, <kamezawa.hiroyu@...fujitsu.com>, Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>, Greg Thelen <gthelen@...gle.com>, Suleiman Souhlal <suleiman@...gle.com>, Michal Hocko <mhocko@...e.cz>, Johannes Weiner <hannes@...xchg.org>, <devel@...nvz.org>, David Rientjes <rientjes@...gle.com>, Christoph Lameter <cl@...ux.com>, Pekka Enberg <penberg@...helsinki.fi> Subject: Re: [PATCH v3 16/28] memcg: kmem controller charge/uncharge infrastructure On 05/30/2012 05:37 PM, Frederic Weisbecker wrote: > Right. __mem_cgroup_get_kmem_cache() fetches the memcg of the owner > and calls memcg_create_cache_enqueue() which does css_tryget(&memcg->css). > After this tryget I think you're fine. And in-between you're safe against > css_set removal due to rcu_read_lock(). > > I'm less clear with __mem_cgroup_new_kmem_page() though... That one does not get memcg->css but it does call mem_cgroup_get(), that does prevent against the memcg structure being freed, which I believe to be good enough. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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