linux-kernel - Re: [vfs] 662aa027bda: -7.2% will-it-scale.scalability

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Date:	Tue, 27 May 2014 18:25:39 +0200
From:	Miklos Szeredi <mszeredi@...e.cz>
To:	Jet Chen <jet.chen@...el.com>
Cc:	Fengguang Wu <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: Re: [vfs] 662aa027bda: -7.2% will-it-scale.scalability

On Tue, 2014-05-27 at 23:58 +0800, Jet Chen wrote:
> Hi Miklos,
> 
> FYI, we noticed the below changes on
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git overlayfs.v22
> commit 662aa027bdaa082aa3dd21886830c97a1dd4c184 ("vfs: add RENAME_WHITEOUT")
> 
> test case: lkp-wsx01/will-it-scale/lseek2

The only thing I see in that commit that could affect performance is the
slightly larger icache footprint of ext4_rename().

Is the regression reproducible across different -rc versions?

Thanks,
Miklos

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