Re: [PATCH v6 00/11] Kernel address sanitizer - runtime memory debugger.

[Andrey Ryabinin]

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