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From: Andrew Morton <akpm@linux-foundation.org>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Alexander Potapenko <glider@google.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Christoph Lameter <cl@linux.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Marc Zyngier <marc.zyngier@arm.com>,
	Dave Martin <dave.martin@arm.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	"Eric W . Biederman" <ebiederm@xmission.com>,
	Ingo Molnar <mingo@kernel.org>,
	Paul Lawrence <paullawrence@google.com>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Arnd Bergmann <arnd@arndb.de>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Kate Stewart <kstewart@linuxfoundation.org>,
	Mike Rapoport <rppt@linux.vnet.ibm.com>,
	kasan-dev <kasan-dev@googlegroups.com>,
	linux-doc@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	linux-sparse@vger.kernel.org,
	Linux Memory Management List <linux-mm@kvack.org>,
	Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
	Kostya Serebryany <kcc@google.com>,
	Evgeniy Stepanov <eugenis@google.com>,
	Lee Smith <Lee.Smith@arm.com>,
	Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>,
	Jacob Bramley <Jacob.Bramley@arm.com>,
	Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>,
	Jann Horn <jannh@google.com>, Mark Brand <markbrand@google.com>,
	Chintan Pandya <cpandya@codeaurora.org>
Subject: Re: [PATCH v4 00/17] khwasan: kernel hardware assisted address sanitizer
Date: Fri, 29 Jun 2018 19:41:17 -0700	[thread overview]
Message-ID: <20180629194117.01b2d31e805808eee5c97b4d@linux-foundation.org> (raw)
In-Reply-To: <CAAeHK+xsBOKghUp9XhpfXGqU=gjSYuy3G2GH14zWNEmaLPy8_w@mail.gmail.com>

On Fri, 29 Jun 2018 14:45:08 +0200 Andrey Konovalov <andreyknvl@google.com> wrote:

> >> What kind of memory consumption testing would you like to see?
> >
> > Well, 100kb or so is a teeny amount on virtually any machine.  I'm
> > assuming the savings are (much) more significant once the machine gets
> > loaded up and doing work?
> 
> So with clean kernel after boot we get 40 kb memory usage. With KASAN
> it is ~120 kb, which is 200% overhead. With KHWASAN it's 50 kb, which
> is 25% overhead. This should approximately scale to any amounts of
> used slab memory. For example with 100 mb memory usage we would get
> +200 mb for KASAN and +25 mb with KHWASAN. (And KASAN also requires
> quarantine for better use-after-free detection). I can explicitly
> mention the overhead in %s in the changelog.
> 
> If you think it makes sense, I can also make separate measurements
> with some workload. What kind of workload should I use?

Whatever workload people were running when they encountered problems
with KASAN memory consumption ;)

I dunno, something simple.  `find / > /dev/null'?


  parent reply	other threads:[~2018-06-30  2:41 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-26 13:15 [PATCH v4 00/17] khwasan: kernel hardware assisted address sanitizer Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 01/17] khwasan, mm: change kasan hooks signatures Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 02/17] khwasan: move common kasan and khwasan code to common.c Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 03/17] khwasan: add CONFIG_KASAN_GENERIC and CONFIG_KASAN_HW Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 04/17] khwasan, arm64: adjust shadow size for CONFIG_KASAN_HW Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 05/17] khwasan: initialize shadow to 0xff Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 06/17] khwasan, arm64: untag virt address in __kimg_to_phys and _virt_addr_is_linear Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 07/17] khwasan: add tag related helper functions Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 08/17] khwasan, arm64: fix up fault handling logic Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 09/17] khwasan, arm64: enable top byte ignore for the kernel Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 10/17] khwasan, mm: perform untagged pointers comparison in krealloc Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 11/17] khwasan: split out kasan_report.c from report.c Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 12/17] khwasan: add bug reporting routines Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 13/17] khwasan: add hooks implementation Andrey Konovalov
2018-07-25 13:44   ` Vincenzo Frascino@Foss
2018-07-31 13:05     ` Andrey Konovalov
2018-07-31 14:50       ` Andrey Ryabinin
2018-07-31 15:03         ` Dmitry Vyukov
2018-07-31 15:38           ` Christopher Lameter
2018-07-31 16:03             ` Dmitry Vyukov
2018-07-31 16:04           ` Andrey Ryabinin
2018-07-31 16:08             ` Dmitry Vyukov
2018-07-31 16:18               ` Andrey Ryabinin
2018-07-31 15:21         ` Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 14/17] khwasan, arm64: add brk handler for inline instrumentation Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 15/17] khwasan, mm, arm64: tag non slab memory allocated via pagealloc Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 16/17] khwasan: update kasan documentation Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 17/17] kasan: add SPDX-License-Identifier mark to source files Andrey Konovalov
2018-06-27 23:08 ` [PATCH v4 00/17] khwasan: kernel hardware assisted address sanitizer Andrew Morton
2018-06-28  0:04   ` Kostya Serebryany
     [not found]     ` <CAEZpscCcP6=O_OCqSwW8Y6u9Ee99SzWN+hRcgpP2tK=OEBFnNw@mail.gmail.com>
2018-06-28  1:11       ` Andrew Morton
2018-06-28 18:26         ` Andrey Konovalov
2018-06-28  7:01     ` Geert Uytterhoeven
2018-07-02 20:33     ` Matthew Wilcox
2018-07-02 23:39       ` Evgenii Stepanov
2018-06-28 18:29   ` Andrey Konovalov
2018-06-28 19:40     ` Andrew Morton
2018-06-29 12:45       ` Andrey Konovalov
2018-06-29 13:01         ` Mark Rutland
2018-06-29 14:40           ` Andrey Konovalov
2018-06-30  2:41         ` Andrew Morton [this message]
2018-07-02 19:16           ` Evgenii Stepanov
2018-07-02 19:21             ` Andrew Morton
2018-07-02 20:22               ` Evgenii Stepanov
2018-07-02 20:30                 ` Andrew Morton
2018-06-28 10:51 ` Dave Martin
2018-06-28 18:56   ` Andrey Konovalov
2018-06-29 10:14     ` Mark Rutland
2018-06-29 11:04     ` Dave Martin
2018-06-29 11:26       ` Luc Van Oostenryck
2018-06-29 13:18         ` Andrey Konovalov
2018-06-29 13:42         ` Dan Carpenter
2018-06-29 11:07     ` Catalin Marinas
2018-06-29 11:07     ` Will Deacon
2018-06-29 16:36       ` Andrey Konovalov
2018-07-03 17:36         ` Will Deacon
2018-07-18 17:16           ` Andrey Konovalov
2018-07-31 13:22             ` Andrey Konovalov
2018-08-01 16:35               ` Will Deacon
2018-08-01 16:52                 ` Dmitry Vyukov
2018-08-02 11:10                   ` Catalin Marinas
2018-08-02 11:36                     ` Dmitry Vyukov
2018-08-02 13:52                       ` Catalin Marinas
2018-08-02 14:11                         ` Andrey Ryabinin
2018-08-03  9:23                   ` Will Deacon
2018-08-03  9:42                     ` Dmitry Vyukov
2018-08-08 16:27                       ` Will Deacon
2018-08-08 16:53                         ` Dmitry Vyukov

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