linux-kernel - Re: [PATCH] printk: add KERN_NOTIME to skip the timestamp

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Message-ID: <20190213062912.GA23233@jagdpanzerIV>
Date:   Wed, 13 Feb 2019 15:29:12 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     xiang xiao <xiaoxiang781216@...il.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        linux-kernel@...r.kernel.org, Xiang Xiao <xiaoxiang@...omi.com>
Subject: Re: [PATCH] printk: add KERN_NOTIME to skip the timestamp

On (02/13/19 14:19), xiang xiao wrote:
> Here is my case:
> 1.A small MCU(Cortex M4) in SoC run RTOS
> 2.RTOS append timestamp to log for the accurate timing
> 3.RTOS send log to Linux kernel when buffer exceed the threshold
> 4.Kernel call printk to dump the received buffer
> So I want that printk skip the timestamp here.
> 
> > If anything, I would probably prefer that we export whether
> > time is being printed, and have the caller not print time if printk is
> > doing it already, than to add the complexity into printk itself.
> 
> Actually, the timestamp of our initial implementation like your
> suggestion come from printk,

cat /sys/module/printk/parameters/time ?

Y - we add time prefix
N - we don't add time prefix

	-ss