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Date:	Tue, 9 Apr 2013 07:02:50 +0200
From:	Richard Cochran <>
To:	John Stultz <>
Cc:	Pawel Moll <>,
	Peter Zijlstra <>,
	Stephane Eranian <>,
	David Ahern <>,
	Thomas Gleixner <>,
	LKML <>,
	"" <>, Paul Mackerras <>,
	Anton Blanchard <>,
	Will Deacon <>,
	"" <>,
	Pekka Enberg <>,
	Steven Rostedt <>,
	Robert Richter <>
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

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