linux-kernel - RE: [genirq] cbe16f35be: will-it-scale.per_thread

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Date:   Tue, 27 Apr 2021 13:37:53 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "Song Bao Hua \(Barry Song\)" <song.bao.hua@...ilicon.com>,
        kernel test robot <oliver.sang@...el.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "lkp\@lists.01.org" <lkp@...ts.01.org>,
        "lkp\@intel.com" <lkp@...el.com>,
        "ying.huang\@intel.com" <ying.huang@...el.com>,
        "feng.tang\@intel.com" <feng.tang@...el.com>,
        "zhengjun.xing\@intel.com" <zhengjun.xing@...el.com>
Subject: RE: [genirq]  cbe16f35be:  will-it-scale.per_thread_ops -5.2% regression

On Tue, Apr 27 2021 at 09:20, Song Bao Hua wrote:
>> FYI, we noticed a -5.2% regression of will-it-scale.per_thread_ops due to
>> commit:
>> 
>> 
>> commit: cbe16f35bee6880becca6f20d2ebf6b457148552 ("genirq: Add IRQF_NO_AUTOEN
>> for request_irq/nmi()")
>> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
>> 
>
> Might be relevant. Can't figure out the relation between getppid and
> request_irq().

Me neither ...