linux-kernel - Re: [workqueue] 1a0a67f5ef: phoronix-test-suite.fio.SequentialRead.IO_uring.Yes.No.1MB.DefaultTestDirectory.mb

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Date:   Wed, 13 Jul 2022 14:09:28 +0800
From:   Schspa Shi <schspa@...il.com>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     0day robot <lkp@...el.com>, LKML <linux-kernel@...r.kernel.org>,
        lkp@...ts.01.org, ying.huang@...el.com, feng.tang@...el.com,
        zhengjun.xing@...ux.intel.com, fengwei.yin@...el.com,
        guobing.chen@...el.com, ming.a.chen@...el.com, frank.du@...el.com,
        Shuhua.Fan@...el.com, wangyang.guo@...el.com,
        Wenhuan.Huang@...el.com, jessica.ji@...el.com, shan.kang@...el.com,
        guangli.li@...el.com, tiejun.li@...el.com, yu.ma@...el.com,
        dapeng1.mi@...el.com, jiebin.sun@...el.com, gengxin.xie@...el.com,
        fan.zhao@...el.com, tj@...nel.org, jiangshanlai@...il.com
Subject: Re: [workqueue]  1a0a67f5ef:
 phoronix-test-suite.fio.SequentialRead.IO_uring.Yes.No.1MB.DefaultTestDirectory.mb_s
 -17.7% regression


kernel test robot <oliver.sang@...el.com> writes:

> Greeting,
>
> FYI, we noticed a -17.7% regression of phoronix-test-suite.fio.SequentialRead.IO_uring.Yes.No.1MB.DefaultTestDirectory.mb_s due to commit:
>

This performance drop can be fixed by convert to wq_pool_attach_mutex
to a rwsem, or add another lock for this. I will upload a new PATCH
version for this.

-- 
BRs
Schspa Shi