linux-kernel - Re: [PATCH] kernel: use ktime_get_real_ts64() to calculate acct.ac

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Message-ID: <20191107124918.GH4131@hirez.programming.kicks-ass.net>
Date:   Thu, 7 Nov 2019 13:49:18 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Jan Stancek <jstancek@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>, ltp@...ts.linux.it,
        Al Viro <viro@...iv.linux.org.uk>,
        Greg KH <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH] kernel: use ktime_get_real_ts64() to calculate
 acct.ac_btime

On Thu, Nov 07, 2019 at 09:56:12AM +0100, Thomas Gleixner wrote:
> But it would be way simpler just to store the CLOCK_REALTIME start time
> along with BOOT and MONOTONIC and just get rid of all these horrible
> calculations which are bound to be wrong.
> 
> Peter?

So I'd really hate to do that, as that gives the impression REALTIME is
a sane clock to use. As I argued in that other email, REALTIME is
horrible crap.