linux-kernel - Re: [PATCH v6 00/11] Kernel address sanitizer

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Date:	Fri, 21 Nov 2014 14:06:57 +0300
From:	Andrey Ryabinin <a.ryabinin@...sung.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Konstantin Serebryany <kcc@...gle.com>,
	Dmitry Chernenkov <dmitryc@...gle.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Yuri Gribov <tetra2005@...il.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Michal Marek <mmarek@...e.cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Dave Hansen <dave.hansen@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	Vegard Nossum <vegard.nossum@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Dave Jones <davej@...hat.com>,
	Jonathan Corbet <corbet@....net>,
	Joe Perches <joe@...ches.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v6 00/11] Kernel address sanitizer - runtime memory
 debugger.

On 11/21/2014 02:00 AM, Andrew Morton wrote:
> On Thu, 20 Nov 2014 20:32:30 +0400 Dmitry Vyukov <dvyukov@...gle.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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