linux-kernel - Re: [PATCH v2 1/3] tracing,x86: add a TSC trace

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Message-ID: <CAJL_ekvw2qsNOj1AuHQB5AOrQ+Lanv0pkr4p97-a_h-uDnXdrg@mail.gmail.com>
Date:	Tue, 18 Sep 2012 14:46:43 -0700
From:	David Sharp <dhsharp@...gle.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: [PATCH v2 1/3] tracing,x86: add a TSC trace_clock

On Wed, Sep 12, 2012 at 6:23 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> This change will require an ack from one of the x86 maintainers.
>
> For reference to this patch, please see this thread:
>
>  https://lkml.org/lkml/2012/9/11/572
>
> On Wed, 2012-09-12 at 16:31 -0700, David Sharp wrote:
>> In order to promote interoperability between userspace tracers and ftrace,
>> add a trace_clock that reports raw TSC values which will then be recorded
>> in the ring buffer. Userspace tracers that also record TSCs are then on
>> exactly the same time base as the kernel and events can be unambiguously
>> interlaced.
>>
>> Tested: Enabled a tracepoint and the "tsc" trace_clock and saw very large
>> timestamp values.
>>
>> v2:
>> Move arch-specific bits out of generic code.
>
> As Masami pointed out, please add a SOB to your patches.

Sorry about that. I guess that's what happens when I rush before going
on vacation. Apparently I did `git format-patch --signoff` the first
time instead of in the commit.
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