linux-kernel - Re: [lkp-robot] [fs] 3deb642f0d: will-it-scale.per_process

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Message-ID: <20180627070745.GA9765@lst.de>
Date:   Wed, 27 Jun 2018 09:07:45 +0200
From:   Christoph Hellwig <hch@....de>
To:     Ye Xiaolong <xiaolong.ye@...el.com>
Cc:     Christoph Hellwig <hch@....de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>, lkp@...org,
        viro@...iv.linux.org.uk
Subject: Re: [lkp-robot] [fs]  3deb642f0d:  will-it-scale.per_process_ops
        -8.8% regression

On Tue, Jun 26, 2018 at 02:03:38PM +0800, Ye Xiaolong wrote:
> Hi,
> 
> On 06/22, Christoph Hellwig wrote:
> >Hi Xiaolong,
> >
> >can you retest this workload on the following branch:
> >
> >    git://git.infradead.org/users/hch/vfs.git remove-get-poll-head
> >
> >Gitweb:
> >
> >    http://git.infradead.org/users/hch/vfs.git/shortlog/refs/heads/remove-get-poll-head
> 
> Here is the comparison for commit 3deb642f0d and commit 8fbedc1 ("fs: replace f_ops->get_poll_head with a static ->f_poll_head pointer") in remove-get-poll-head branch.

Especially the boot time ones and others look like they have additional
changes.

Can you compare the baseline of my tree, which is
894b8c00 ("Merge tag 'for_v4.18-rc2' of
git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs") against 8fbedc1
(("fs: replace f_ops->get_poll_head with a static ->f_poll_head pointer") ?