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

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Date:	Fri, 27 Feb 2015 11:53:04 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Huang Ying <ying.huang@...ux.intel.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: Re: [LKP] [mm] 3484b2de949: -46.2% aim7.jobs-per-min

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.

-- 
Mel Gorman
SUSE Labs
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