From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1753813AbcCHLD2 (ORCPT <rfc822;w@1wt.eu>);
	Tue, 8 Mar 2016 06:03:28 -0500
Received: from mx1.redhat.com ([209.132.183.28]:60564 "EHLO mx1.redhat.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1750791AbcCHLD1 (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Tue, 8 Mar 2016 06:03:27 -0500
Message-ID: <56DEB17C.9000201@redhat.com>
Date: Tue, 08 Mar 2016 06:03:24 -0500
From: Prarit Bhargava <prarit@redhat.com>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0
MIME-Version: 1.0
To: Thomas Gleixner <tglx@linutronix.de>
CC: linux-kernel@vger.kernel.org, Petr Mladek <pmladek@suse.com>,
        John Stultz <john.stultz@linaro.org>,
        Xunlei Pang <pang.xunlei@linaro.org>,
        Baolin Wang <baolin.wang@linaro.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Petr Mladek <pmladek@suse.cz>, Tejun Heo <tj@kernel.org>,
        Peter Hurley <peter@hurleysoftware.com>,
        Vasily Averin <vvs@virtuozzo.com>, Joe Perches <joe@perches.com>
Subject: Re: [PATCH 0/2 v6] printk, Add monotonic and real printk timestamps
References: <1456250040-22351-1-git-send-email-prarit@redhat.com> <alpine.DEB.2.11.1603080858570.3859@nanos>
In-Reply-To: <alpine.DEB.2.11.1603080858570.3859@nanos>
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 7bit
X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Tue, 08 Mar 2016 11:03:26 +0000 (UTC)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org



On 03/08/2016 02:59 AM, Thomas Gleixner wrote:
> On Tue, 23 Feb 2016, Prarit Bhargava wrote:
> 
>> This patchset adds monotonic and real printk timestamps.  The first patch
>> changes CONFIG_PRINT_TIME from a bool to an int to allow for the additional
>> timestamps that are added in patch 2.
>>
>> Changes from v6: Petr Mladek pointed out that the current patch
>> fails to indicate to userspace programs which timestamp is being used.
> 
> How is that solved?

Hi Thomas,

Userspace programs can now look at /sys/modules/printk/parameters/time which
will contain [0-3] for the timestamp clock.

The file is globally readable so it shouldn't cause any problems for userspace
programs:

[root@intel-wildcatpass-06 dummy-module]# ls -l /sys/module/printk/parameters/time
-rw-r--r--. 1 root root 4096 Mar  8 06:01 /sys/module/printk/parameters/time

P.

> 
> Thanks,
> 
> 	tglx
>