linux-kernel - Re: [PATCH v1 8/8] mm: kasan: Initial memory quarantine implementation

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Message-ID: <alpine.DEB.2.20.1602190940320.8084@east.gentwo.org>
Date:	Fri, 19 Feb 2016 09:43:54 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Dmitry Vyukov <dvyukov@...gle.com>
cc:	Joonsoo Kim <js1304@...il.com>,
	Alexander Potapenko <glider@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	kasan-dev <kasan-dev@...glegroups.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [PATCH v1 8/8] mm: kasan: Initial memory quarantine
 implementation

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*!!!