Messages in this thread | | | From | Thomas Gleixner <> | Subject | Re: [x86/signal] 3aac3ebea0: will-it-scale.per_thread_ops -11.9% regression | Date | Tue, 07 Dec 2021 21:36:31 +0100 |
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On Tue, Dec 07 2021 at 18:49, Chang Seok Bae wrote: > On Dec 7, 2021, at 05:38, Thomas Gleixner <tglx@linutronix.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
But how does that affect the test written in C? Mysterious!
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