[Patch][LNT] Make submission configurable per metric

[Chris Matthews]

LGTM.

> On May 18, 2015, at 10:48 AM, Kristof Beyls <kristof.beyls at arm.com> wrote:
> 
> Hi,
>  
> The attached patch makes it possible to not submit specific metrics/stats to the server when doing an lnt benchmark-run.
> The use on the command line looks as follows: lnt runtest nt --submit … --exclude-stat-from-submission=compile …
>  
> The motivation for being able to disable submitting certain stats is that the compile time metric on
> http://llvm.org/perf/db_default/v4/nts/machine/39 <http://llvm.org/perf/db_default/v4/nts/machine/39> should not be submitted, as it is highly noisy and not suitable for analysis.
> The reason for that is that this is a big.LITTLE board, with 2 Cortex-A57s and 4 Cortex-A53s, and during different builds, the
> same program will be compiled on a different set of A57s or A53s. I also don’t want to pin the compile on a single core, as that
> would slow down the bot, and it’s main purpose is to measure the speed of generated AArch64 code.
>  
> Please review,
>  
> Kristof
>  
>  
> <disable_submission_of_certain_stats.diff>

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