linux-kernel - Re: [x86/signal] 3aac3ebea0: will-it-scale.per_thread

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Message-ID: <81783AEA-1313-4353-837D-8217DEF3B9A2@intel.com>
Date:   Tue, 7 Dec 2021 18:49:59 +0000
From:   "Bae, Chang Seok" <chang.seok.bae@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
CC:     "Sang, Oliver" <oliver.sang@...el.com>,
        Borislav Petkov <bp@...e.de>,
        LKML <linux-kernel@...r.kernel.org>,
        "lkp@...ts.01.org" <lkp@...ts.01.org>, lkp <lkp@...el.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        "Tang, Feng" <feng.tang@...el.com>,
        "zhengjun.xing@...ux.intel.com" <zhengjun.xing@...ux.intel.com>,
        "Yin, Fengwei" <fengwei.yin@...el.com>
Subject: Re: [x86/signal]  3aac3ebea0:  will-it-scale.per_thread_ops -11.9%
 regression

On Dec 7, 2021, at 05:38, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Tue, Dec 07 2021 at 09:21, kernel test robot wrote:
>> (please be noted we made some further analysis before reporting out,
>> and thought it's likely the regression is related with the extra spinlock
>> introducded by enalbling DYNAMIC_SIGFRAME. below is the full report.)
>> 
>> FYI, we noticed a -11.9% regression of will-it-scale.per_thread_ops due to commit:
> 
> Does that use sigaltstack() ?

FWIW, I was also wondering about this with:

$ git clone https://github.com/antonblanchard/will-it-scale.git
$ cd will-it-scale/
$ git grep sigaltstack
$

But, the test seems to use python via runtest.py. And the python code has
sigaltstack():
    https://github.com/python/cpython/blob/main/Modules/faulthandler.c#L454

Thanks,
Chang