linux-kernel - Re: [LKP] [mm] 3484b2de949: -46.2% aim7.jobs-per-min

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Date:	Sat, 28 Feb 2015 09:24:59 +0800
From:	Huang Ying <ying.huang@...ux.intel.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: Re: [LKP] [mm] 3484b2de949: -46.2% aim7.jobs-per-min

On Fri, 2015-02-27 at 11:53 +0000, Mel Gorman wrote:
> On Fri, Feb 27, 2015 at 03:21:36PM +0800, Huang Ying wrote:
> > FYI, we noticed the below changes on
> > 
> > git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > commit 3484b2de9499df23c4604a513b36f96326ae81ad ("mm: rearrange zone fields into read-only, page alloc, statistics and page reclaim lines")
> > 
> > The perf cpu-cycles for spinlock (zone->lock) increased a lot.  I suspect there are some cache ping-pong or false sharing.
> > 
> 
> Annoying because this is pretty much the opposite of what I found during
> testing. What is the kernel config? Similar to the kernel config, can you
> post "pahole -C zone vmlinux" for the kernel you built? I should get the same
> result if I use the same kernel config but no harm in being sure. Thanks.

The kconfig is attached with the email.  I will send out pahole result
later.

Best Regards,
Huang, Ying


View attachment "config-3.16.0-06558-g3484b2d" of type "text/x-mpsub" (126967 bytes)