linux-kernel - Re: [ACPI / hotplug / PCI] 1b360f44d00: -80.9% vm-scalability.stddev

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Date:	Wed, 05 Mar 2014 13:58:54 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: Re: [ACPI / hotplug / PCI] 1b360f44d00: -80.9% vm-scalability.stddev

On Wednesday, March 05, 2014 04:23:36 PM Fengguang Wu wrote:
> Hi Rafael,

Hi,

> I don't know why but we are glad to find the below changes on commit

Do I understand correcty that you mean you're seeing improvement?

Either way, if the test below doesn't involve hotplug or device removal via
sysfs, I have no explanation ...

> 1b360f44d009059e446532f29c1a889951e72667 ("ACPI / hotplug / PCI: Fix bridge removal race in handle_hotplug_event()")
> 
> test case: brickland2/micro/vm-scalability/300s-anon-r-rand-mt
> 
> d42f5da23400833  1b360f44d009059e446532f29  
> ---------------  -------------------------  
>       3.54 ~164%     -80.9%       0.68 ~37% TOTAL vm-scalability.stddev
>      14177 ~ 7%     -22.1%      11040 ~ 7%  TOTAL numa-meminfo.node0.SReclaimable
>       3543 ~ 7%     -22.1%       2759 ~ 7%  TOTAL numa-vmstat.node0.nr_slab_reclaimable
>     776196 ~ 6%     -10.0%     698893 ~ 5%  TOTAL numa-numastat.node2.local_node
>     776196 ~ 6%     -10.0%     698894 ~ 5%  TOTAL numa-numastat.node2.numa_hit
> 
> The ~XX% numbers are stddev percent.
> The [+-]XX% is change percent.
> 
> The below graph shows all samples collected during the bisect
> 
> [*] bisect-good
> [O] bisect-bad ("bad" in the sense of bisect)
> 
> In which you can see the stableness of the change and bisect.
> 
>                                vm-scalability.stddev
> 
>    16 ++--------------------------------------------------------------------+
>       |                                                                 *   |
>    14 ++                                                                :   |
>    12 ++                                                                :   |
>       |                                                                 ::  |
>    10 ++                                                                ::  |
>       |                                                                 ::  |
>     8 ++                                                                ::  |
>       |                                                                : :  |
>     6 ++                                                    *          : :  |
>     4 ++           *      *                                 ::         :  : |
>       |           +:     : +                       *       : :         :  : |
>     2 ++*.   *. .*  :    :  *          .*.        + :      :  :   .*   :  : |
>       |+  * +  *    *. .* O  *.*.*. .**   O.**.O.* O: *.O.* O OO.*  +  :  *.|
>     0 O+O-OO-O-O-O-OO-O-O---OO-O-O-O-OO-O---OO-*-O---OO-*-O------O-O-*-*----*
> 
> 
> Thanks,
> Fengguang
> --
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-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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