linux-hardening - Re: [RFC v2 0/2] dmapool: Mitigate device-controllable mem. corruption

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Message-ID: <Zz4vzSRcdjvWNIgK@kbusch-mbp>
Date: Wed, 20 Nov 2024 11:51:57 -0700
From: Keith Busch <kbusch@...nel.org>
To: Christoph Hellwig <hch@...radead.org>
Cc: Brian Johannesmeyer <bjohannesmeyer@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
	Raphael Isemann <teemperor@...il.com>,
	Cristiano Giuffrida <giuffrida@...vu.nl>,
	Herbert Bos <h.j.bos@...nl>, Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [RFC v2 0/2] dmapool: Mitigate device-controllable mem.
 corruption

On Wed, Nov 20, 2024 at 01:29:19AM -0800, Christoph Hellwig wrote:
> On Tue, Nov 19, 2024 at 09:55:27PM +0100, Brian Johannesmeyer wrote:
> > **Performance**. I evaluated the patch set's performance by running the
> > `DMAPOOL_TEST` test with `DMAPOOL_DEBUG` enabled and with/without the
> > patches applied. Here is its output *without* the patches applied:

Could you rerun your tests without DMAPOOL_DEBUG enabled? That's the
more interesting kernel setup for performance comparisions.