linux-kernel - Re: [GIT pull] printk updates for 4.15

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Date:   Tue, 14 Nov 2017 15:00:04 -0800
From:   Joe Perches <joe@...ches.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Mark Salyzyn <salyzyn@...roid.com>, Petr Mladek <pmladek@...e.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Prarit Bhargava <prarit@...hat.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [GIT pull] printk updates for 4.15

On Tue, 2017-11-14 at 23:50 +0100, Thomas Gleixner wrote:
> Something like the untested patch below should do the storage and converts
> the primary timestamp from local_clock() to clock monotonic.

trivia:

> --- a/kernel/printk/printk.c
> +++ b/kernel/printk/printk.c
> @@ -352,7 +352,11 @@ enum log_flags {
>  };
>  
>  struct printk_log {
> -	u64 ts_nsec;		/* timestamp in nanoseconds */
> +	/* Timestamps in nanoseconds */
> +	union {
> +		u64			ts_nsec;
> +		struct timestamps	ts;

struct timestamps could probably use a better name

> --- a/include/linux/timekeeping.h
> +++ b/include/linux/timekeeping.h
> @@ -146,7 +146,19 @@ extern void timekeeping_inject_sleeptime
>   * PPS accessor
>   */
>  extern void ktime_get_raw_and_real_ts64(struct timespec64 *ts_raw,
> -				        struct timespec64 *ts_real);
> +					struct timespec64 *ts_real);
> +
> +/*
> + * struct timestanps - Simultaneous mono/boot/real timestamps

typo timestamps

> + * @mono:	Monotonic timestamp
> + * @boot:	Boottime timestamp
> + * @real:	Realtime timestamp
> + */
> +struct timestamps {
> +	u64		mono;
> +	u64		boot;
> +	u64		real;
> +};

Maybe something like struct system_event_timestamps ?