Message-ID: <4FEAD351.2030203@parallels.com>
Date: Wed, 27 Jun 2012 13:33:05 +0400
From: Glauber Costa <glommer@parallels.com>
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To: David Rientjes <rientjes@google.com>
CC: <cgroups@vger.kernel.org>, <linux-mm@kvack.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        <linux-kernel@vger.kernel.org>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Pekka Enberg <penberg@kernel.org>, Michal Hocko <mhocko@suse.cz>,
        Johannes Weiner <hannes@cmpxchg.org>, Christoph Lameter <cl@linux.com>,
        <devel@openvz.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
        Tejun Heo <tj@kernel.org>, Pekka Enberg <penberg@cs.helsinki.fi>
Subject: Re: [PATCH 06/11] memcg: kmem controller infrastructure
References: <1340633728-12785-1-git-send-email-glommer@parallels.com> <1340633728-12785-7-git-send-email-glommer@parallels.com> <alpine.DEB.2.00.1206260210200.16020@chino.kir.corp.google.com> <4FE97E31.3010201@parallels.com> <alpine.DEB.2.00.1206262100320.24245@chino.kir.corp.google.com>
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>>
>> Nothing, but I also don't see how to prevent that.
>
> You can test for current->flags & PF_KTHREAD following the check for
> in_interrupt() and return true, it's what you were trying to do with the
> check for !current->mm.
>

am I right to believe that if not in interrupt context - already ruled 
out - and !(current->flags & PF_KTHREAD), I am guaranteed to have a mm 
context, and thus, don't need to test against it ?

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