linux-kernel - Re: [PATCH v5 1/3] tracing,x86: Add a TSC trace

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Message-ID: <CAJL_ekuSbPDDLbJy3b5k3iMEejZv=_CJUYM2anrUEOhQEqNsjQ@mail.gmail.com>
Date:	Thu, 11 Oct 2012 16:30:07 -0700
From:	David Sharp <dhsharp@...gle.com>
To:	Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com>
Cc:	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.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 v5 1/3] tracing,x86: Add a TSC trace_clock

On Mon, Oct 8, 2012 at 7:08 PM, Yoshihiro YUNOMAE
<yoshihiro.yunomae.ez@...achi.com> wrote:
> Hi David,
>
> This is a nice patch set.
>
> I just have found something should be fixed, which related to
> your work. I'll send it following this mail.
>
> Would you mind adding these patches as your patch series?

Thanks for noticing the stats issue. Added them to my series.

>
> Thanks,
>
> Yoshihiro YUNOMAE
>
> (2012/10/02 12:31), 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.
>>
>
> --
> Yoshihiro YUNOMAE
> Software Platform Research Dept. Linux Technology Center
> Hitachi, Ltd., Yokohama Research Laboratory
> E-mail: yoshihiro.yunomae.ez@...achi.com
>
>
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