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Date:   Fri, 8 Jan 2021 10:51:56 +0100
From:   Peter Zijlstra <>
To:     David Laight <>
Cc:     'Linus Torvalds' <>,
        Al Viro <>,
        kernel test robot <>,
        Thomas Gleixner <>,
        Ingo Molnar <>, Borislav Petkov <>,
        LKML <>,
        "" <>,
        kernel test robot <>,
        "Huang, Ying" <>,
        Feng Tang <>,
        "" <>
Subject: Re: [x86] d55564cfc2: will-it-scale.per_thread_ops -5.8% regression

On Fri, Jan 08, 2021 at 09:37:45AM +0000, David Laight wrote:
> The lack of spinlocks in userspace really kills you.

Glibc has them, but please don't complain about lock holder preemption
issues if you do actually use them ;-)

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