From: Prarit Bhargava <prarit@redhat.com>
To: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Mark Salyzyn <salyzyn@android.com>,
Petr Mladek <pmladek@suse.com>
Cc: linux-kernel@vger.kernel.org, Jonathan Corbet <corbet@lwn.net>,
Steven Rostedt <rostedt@goodmis.org>,
John Stultz <john.stultz@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>,
Stephen Boyd <sboyd@codeaurora.org>,
Andrew Morton <akpm@linux-foundation.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Christoffer Dall <cdall@linaro.org>,
Deepa Dinamani <deepa.kernel@gmail.com>,
Ingo Molnar <mingo@kernel.org>,
Joel Fernandes <joelaf@google.com>,
Kees Cook <keescook@chromium.org>,
Peter Zijlstra <peterz@infradead.org>,
Geert Uytterhoeven <geert+renesas@glider.be>,
"Luis R. Rodriguez" <mcgrof@kernel.org>,
Nicholas Piggin <npiggin@gmail.com>,
"Jason A. Donenfeld" <Jason@zx2c4.com>,
Olof Johansson <olof@lixom.net>,
Josh Poimboeuf <jpoimboe@redhat.com>,
linux-doc@vger.kernel.org
Subject: Re: [PATCH 3/3 v11] printk: Add monotonic, boottime, and realtime timestamps
Date: Tue, 19 Sep 2017 07:52:33 -0400 [thread overview]
Message-ID: <5cd0541d-148c-b131-076a-910f8a900770@redhat.com> (raw)
In-Reply-To: <20170917104634.GA442@tigerII.localdomain>
On 09/17/2017 06:46 AM, Sergey Senozhatsky wrote:
> I'm a bit uncomfortable with the "breaks user space" part. since this
> is a strictly debugging option, would it be sufficient to store those
> extended timestamps as prefixes of every message?
> see (sorry for "self-quoting"):
> lkml.kernel.org/r/20170917062608.GA512@tigerII.localdomain
>
Sergey, I haven't forgotten about the above. It's something
I'm going to look at after this initial patchset is done.
P.
> each message, thus, will be in the following format
>
> [current header: loglevel, timestamp, etc] [extended printk data] message text
>
> extended printk data can contain your monotonic/etc timestamps, and
> anything else.
>
> and then it's up to you how do you grep the messages and process the
> extended data. but the point is - user space tools (journald, dmesg,
> etc.) stays intact. which is kinda nice.
>
> so we can avoid that chicken and egg problem: we break user space
> by merging the patchset but user space people don't want to talk
> about any fixes until we break those tools.
>
> -ss
>
next prev parent reply other threads:[~2017-09-19 11:52 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-05 12:06 [PATCH 0/3 v11] printk: Add new timestamps Prarit Bhargava
2017-09-05 12:06 ` [PATCH 1/3 v11] time: Make fast functions return 0 before timekeeping is initialized Prarit Bhargava
2017-09-05 12:15 ` Thomas Gleixner
2017-09-15 13:42 ` Prarit Bhargava
2017-09-05 12:06 ` [PATCH 2/3 v11] timekeeping: Provide NMI safe access to clock realtime Prarit Bhargava
2017-09-05 12:06 ` [PATCH 3/3 v11] printk: Add monotonic, boottime, and realtime timestamps Prarit Bhargava
2017-09-13 18:30 ` Mark Salyzyn
2017-09-15 13:28 ` Petr Mladek
2017-09-15 14:29 ` Mark Salyzyn
2017-09-17 10:46 ` Sergey Senozhatsky
2017-09-19 11:52 ` Prarit Bhargava [this message]
2017-09-15 14:40 ` Prarit Bhargava
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