linux-kernel - Re: [xfs] 6191cf3ad5: stress-ng.rename.ops_per

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Message-ID: <191b6d46-cb8d-4e5d-8c4c-9dae91e32a45@intel.com>
Date:   Wed, 2 Mar 2022 16:32:02 +0800
From:   Yin Fengwei <fengwei.yin@...el.com>
To:     kernel test robot <oliver.sang@...el.com>,
        Brian Foster <bfoster@...hat.com>
CC:     "Darrick J. Wong" <djwong@...nel.org>,
        Dave Chinner <dchinner@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>, <lkp@...ts.01.org>,
        <lkp@...el.com>, <ying.huang@...el.com>, <feng.tang@...el.com>,
        <zhengjun.xing@...ux.intel.com>
Subject: Re: [xfs] 6191cf3ad5: stress-ng.rename.ops_per_sec -73.5% regression

Hi,

On 2022/1/31 23:49, kernel test robot wrote:
>        0.00           +59.8       59.78        perf-profile.calltrace.cycles-pp.osq_lock.__mutex_lock.flush_workqueue.xfs_fs_statfs.statfs_by_dentry
>       23.44 ±  2%     +61.0       84.49        perf-profile.calltrace.cycles-pp.vfs_statfs.user_statfs.__do_sys_statfs.do_syscall_64.entry_SYSCALL_64_after_hwframe
>       23.40 ±  2%     +61.1       84.47        perf-profile.calltrace.cycles-pp.statfs_by_dentry.vfs_statfs.user_statfs.__do_sys_statfs.do_syscall_64

We did further check of the perf data. From above three lines,
the patch brought higher lock content (+59.8) in this extreme cases.

Regarding the patch could fix race issue, we will not tracking this
report. Let us know if you have any comments. Thanks.


Regards
Yin, Fengwei