[PATCH] [test-suite, LNT] Make the use of perf optional

[Chris Matthews]

LGTM.

> On Sep 18, 2014, at 9:01 AM, Yi Kong <kongy.dev at gmail.com> wrote:
> 
> Committed r218054 and 218056 since no objection was raised and
> execution time wasn't measured by Perf before anyway.
> 
> Cheers,
> Yi
> 
> On 16 September 2014 14:42, Yi Kong <kongy.dev at gmail.com> wrote:
>> Hi all,
>> 
>> This patchset removes perf detection in timeit.sh and replace it with
>> an option in LNT, so that user can have more control about which tool
>> to use. Also this fixes my previous error which caused execution time
>> not actually being measured using perf.
>> 
>> Tobias, Renato: You will need to switch on "--use-perf" option in your
>> zorg config to enable perf on your performance builders.
>> 
>> Ok to commit?
>> 
>> Cheers,
>> Yi