linux-kernel - Re: [PATCH v1 01/25] net: core: device_rename: Use rwsem instead of a seqcount

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Message-ID: <87lfln5w61.fsf@nanos.tec.linutronix.de>
Date:   Wed, 20 May 2020 01:42:30 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     "Ahmed S. Darwish" <a.darwish@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        "Sebastian A. Siewior" <bigeasy@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Subject: Re: [PATCH v1 01/25] net: core: device_rename: Use rwsem instead of a seqcount

Stephen Hemminger <stephen@...workplumber.org> writes:
> On Wed, 20 May 2020 00:23:48 +0200
> Thomas Gleixner <tglx@...utronix.de> wrote:
>> No. We did not. -ENOTESTCASE
>
> Please try, it isn't that hard..
>
> # time for ((i=0;i<1000;i++)); do ip li add dev dummy$i type dummy; done
>
> real	0m17.002s
> user	0m1.064s
> sys	0m0.375s

And that solves the incorrectness of the current code in which way?