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Date: Tue, 3 Mar 2015 10:42:07 -0600 (CST)
From: Christoph Lameter <cl@linux.com>
Subject: Re: [RFC] slub memory quarantine
In-Reply-To: <54F5D5CC.6070901@samsung.com>
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References: <54F57716.80809@samsung.com> <CACT4Y+YQ3cuUvRrT_19RbxFVWHGnzviSFi0-ud88jq9g9jUZog@mail.gmail.com> <54F5D5CC.6070901@samsung.com>
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To: Andrey Ryabinin <a.ryabinin@samsung.com>
Cc: Dmitry Vyukov <dvyukov@google.com>, Andrew Morton <akpm@linux-foundation.org>, David Rientjes <rientjes@google.com>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Pekka Enberg <penberg@kernel.org>, Linux Memory Management List <linux-mm@kvack.org>, Sasha Levin <sasha.levin@oracle.com>, Dmitry Chernenkov <dmitryc@google.com>, Konstantin Khlebnikov <koct9i@gmail.com>, LKML <linux-kernel@vger.kernel.org>

On Tue, 3 Mar 2015, Andrey Ryabinin wrote:

> On 03/03/2015 12:10 PM, Dmitry Vyukov wrote:
> > Please hold on with this.
> > Dmitry Chernenkov is working on a quarantine that works with both slub
> > and slab, does not cause spurious OOMs and does not depend on
> > slub-debug which has unacceptable performance (acquires global lock).
>
> I think that it's a separate issue. KASan already depend on slub_debug - it required for redzones/user tracking.
> I think that some parts slub debugging (like user tracking and this quarantine)
> could be moved (for CONFIG_KASAN=y) to the fast path without any locking.

In general these features need to be ifdeffed out since they add
significant overhead for the data structures and execution paths.

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