linux-kernel - Re: [RFC patch 7/7] timekeeping: Hack to use fine grained timestamps during boot

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Message-ID: <20171128144500.190aa85c@gandalf.local.home>
Date:   Tue, 28 Nov 2017 14:45:00 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Mark Salyzyn <salyzyn@...roid.com>
Cc:     Prarit Bhargava <prarit@...hat.com>,
        Petr Mladek <pmladek@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...uxfoundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Joe Perches <joe@...ches.com>
Subject: Re: [RFC patch 7/7] timekeeping: Hack to use fine grained
 timestamps during boot

On Tue, 28 Nov 2017 11:10:02 -0800
Mark Salyzyn <salyzyn@...roid.com> wrote:

> There is no guarantee of sequential order of delivery for kernel prints.

But isn't the timestamp taken with the logbuf_lock, and then delivered
to the printk buffer? That would guarantee that all events will be in
order, and the timestamps be sequential. They are serialized by the
logbuf_lock.

-- Steve