linux-kernel - Re: [RFC] perf: need to expose sched_clock to correlate user samples with kernel samples

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Message-ID: <20130409050250.GA2499@netboy>
Date:	Tue, 9 Apr 2013 07:02:50 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	Pawel Moll <pawel.moll@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	David Ahern <dsahern@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Anton Blanchard <anton@...ba.org>,
	Will Deacon <Will.Deacon@....com>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	Pekka Enberg <penberg@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Robert Richter <robert.richter@....com>
Subject: Re: [RFC] perf: need to expose sched_clock to correlate user
 samples with kernel samples

On Mon, Apr 08, 2013 at 12:05:52PM -0700, John Stultz wrote:
> 
> So thinking this through further, I'm worried we may _not_ be able
> to eventually enable this to be a vdso as I had earlier hoped.
> Mostly because I'm not sure how the fd -> file -> clock lookup could
> be done in userland (any ideas?).

How about a new clock operation, clock_install_vdso(), that lets the
process arrange for one dynamic clock to be reflected in its vdso
page?

Thanks,
Richard
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