linux-kernel - Re: [PATCH 4/9] select: Micro-optimise __estimate

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Date:   Mon, 9 Sep 2019 15:14:36 +0300
From:   Cyrill Gorcunov <gorcunov@...il.com>
To:     Dmitry Safonov <0x7f454c46@...il.com>
Cc:     Dmitry Safonov <dima@...sta.com>,
        open list <linux-kernel@...r.kernel.org>,
        Adrian Reber <adrian@...as.de>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrei Vagin <avagin@...nvz.org>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux Containers <containers@...ts.linux-foundation.org>,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 4/9] select: Micro-optimise __estimate_accuracy()

On Mon, Sep 09, 2019 at 12:50:27PM +0100, Dmitry Safonov wrote:
> Hi Cyrill,
> 
> On Mon, 9 Sep 2019 at 12:18, Cyrill Gorcunov <gorcunov@...il.com> wrote:
> > Compiler precompute constants so it doesn't do division here.
> > But I didn't read the series yet so I might be missing
> > something obvious.
> 
> Heh, like a division is in ktime_divns()?

Ah, you meant the ktime_divns you've dropped out. I thought
you were talking about the constant value we've had here before
your patch. Seems I didn't got the changelog right. Anyway
need to take more precise look on the series. Hopefully soon.