linux-kernel - Re: [PATCH RFC 3/3] slub: reparent memcg caches' slabs on memcg offline

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Message-ID: <alpine.DEB.2.10.1405270937270.14154@gentwo.org>
Date:	Tue, 27 May 2014 09:38:28 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Vladimir Davydov <vdavydov@...allels.com>
cc:	hannes@...xchg.org, mhocko@...e.cz, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH RFC 3/3] slub: reparent memcg caches' slabs on memcg
 offline

On Fri, 23 May 2014, Vladimir Davydov wrote:

> > If you look at the end of unfreeze_partials() you see that we release
> > locks and therefore enable preempt before calling into the page allocator.
>
> Yes, we release the node's list_lock before calling discard_slab(), but
> we don't enable irqs, which are disabled in put_cpu_partial(), just
> before calling it, so we call the page allocator with irqs off and
> therefore preemption disabled.

Ok that is something that could be fixed.
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