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Date: Fri, 19 Feb 2016 09:43:54 -0600 (CST)
From: Christoph Lameter <cl@linux.com>
Subject: Re: [PATCH v1 8/8] mm: kasan: Initial memory quarantine
 implementation
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To: Dmitry Vyukov <dvyukov@google.com>
Cc: Joonsoo Kim <js1304@gmail.com>, Alexander Potapenko <glider@google.com>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Andrey Konovalov <adech.fo@gmail.com>, Andrew Morton <akpm@linux-foundation.org>, Andrey Ryabinin <ryabinin.a.a@gmail.com>, Steven Rostedt <rostedt@goodmis.org>, kasan-dev <kasan-dev@googlegroups.com>, LKML <linux-kernel@vger.kernel.org>, Linux Memory Management List <linux-mm@kvack.org>

On Fri, 19 Feb 2016, Dmitry Vyukov wrote:

> No, this does not work. We've tried.
> The problem is fragmentation. When all memory is occupied by slab,
> it's already too late to reclaim memory. Free objects are randomly
> scattered over memory, so if you have just 1% of live objects, the
> chances are that you won't be able to reclaim any single page.

Yes that is why slab objects *need* to be *movable*!!!

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