Message-id: <546F1CD1.3060600@samsung.com>
Date: Fri, 21 Nov 2014 14:06:57 +0300
From: Andrey Ryabinin <a.ryabinin@samsung.com>
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To: Andrew Morton <akpm@linux-foundation.org>,
        Dmitry Vyukov <dvyukov@google.com>
Cc: Ingo Molnar <mingo@kernel.org>, Andrey Ryabinin <ryabinin.a.a@gmail.com>,
        Konstantin Serebryany <kcc@google.com>,
        Dmitry Chernenkov <dmitryc@google.com>,
        Andrey Konovalov <adech.fo@gmail.com>,
        Yuri Gribov <tetra2005@gmail.com>,
        Konstantin Khlebnikov <koct9i@gmail.com>,
        Sasha Levin <sasha.levin@oracle.com>, Michal Marek <mmarek@suse.cz>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        Christoph Lameter <cl@linux.com>, Pekka Enberg <penberg@kernel.org>,
        David Rientjes <rientjes@google.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Dave Hansen <dave.hansen@intel.com>, Andi Kleen <andi@firstfloor.org>,
        Vegard Nossum <vegard.nossum@gmail.com>,
        "H. Peter Anvin" <hpa@zytor.com>, "x86@kernel.org" <x86@kernel.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        Randy Dunlap <rdunlap@infradead.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Dave Jones <davej@redhat.com>, Jonathan Corbet <corbet@lwn.net>,
        Joe Perches <joe@perches.com>, LKML <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH v6 00/11] Kernel address sanitizer - runtime memory
 debugger.
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On 11/21/2014 02:00 AM, Andrew Morton wrote:
> On Thu, 20 Nov 2014 20:32:30 +0400 Dmitry Vyukov <dvyukov@google.com> wrote:
> 
>> Let me provide some background first.
> 
> Well that was useful.  Andrey, please slurp Dmitry's info into the 0/n
> changelog?
> 

Sure.

> Also, some quantitative info about the kmemleak overhead would be
> useful.
> 

Confused. Perhaps you mean kmemcheck?

I did some brief performance testing:

$ netperf -l 30

		MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to localhost (127.0.0.1) port 0 AF_INET
		Recv   Send    Send
		Socket Socket  Message  Elapsed
		Size   Size    Size     Time     Throughput
		bytes  bytes   bytes    secs.    10^6bits/sec

no debug:	87380  16384  16384    30.00    41624.72

kasan inline:	87380  16384  16384    30.00    12870.54

kasan outline:	87380  16384  16384    30.00    10586.39

kmemcheck: 	87380  16384  16384    30.03      20.23


So on this workload kasan x500-x600 times faster then kmemcheck.


> In this discussion you've mentioned a few planned kasan enhancements. 
> Please also list those and attempt to describe the amount of effort and
> complexity levels.  Partly so other can understand the plans and partly
> so we can see what we're semi-committing ourselves to if we merge this
> stuff.
> 

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