linux-kernel - Re: [LKP] [xen] 054954eb051f: -49.7% kernel-size.bss

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Date:	Thu, 8 Jan 2015 14:43:13 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Huang Ying <ying.huang@...ux.intel.com>,
	Juergen Gross <jgross@...e.com>
CC:	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: Re: [LKP] [xen] 054954eb051f: -49.7% kernel-size.bss

On 08/01/15 02:58, Huang Ying wrote:
> FYI, we noticed the below changes on
> 
> commit 054954eb051f35e74b75a566a96fe756015352c8 ("xen: switch to linear virtual mapped sparse p2m list")
> 
> testbox/testcase/testparams: vm-kbuild-yocto-ia32/boot/1
> 
> 0aad5689837c882d  054954eb051f35e74b75a566a9  
> ----------------  --------------------------  
>          %stddev     %change         %stddev
>              \          |                \  
>    4161536 ±  0%     -49.7%    2093056 ±  0%  kernel-size.bss

This is a good thing, right?

>                                     kernel-size.bss
> 
>   4.5e+06 *+-*--*--*-*--*--*--*--*--*--*--*-*--*--*--*----------------------+
>           |                                             *..*..              |
>           |                                                   *..*.*..*..*..*
>     4e+06 ++                                                                |
>           |                                                                 |
>           |                                                                 |
>   3.5e+06 ++                                                                |
>           |                                                                 |
>     3e+06 ++                                                                |
>           |                                                                 |
>           |                                                                 |
>   2.5e+06 ++                                                                |
>           |                                                                 |
>           O  O  O  O O  O  O  O  O  O  O  O O  O  O  O  O  O  O  O O        |
>     2e+06 ++----------------------------------------------------------------+

I have no idea what this graph is supposed to be showing.

David
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