Re: [RFC] slub memory quarantine

From: Christoph Lameter
Date: Tue Mar 03 2015 - 11:42:15 EST

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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