linux-kernel - Re: [PATCH 3/6] perf record: add time-of-day option

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Date:	Tue, 01 Mar 2011 17:00:50 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	David Ahern <daahern@...co.com>
Cc:	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	acme@...stprotocols.net, mingo@...e.hu, fweisbec@...il.com,
	paulus@...ba.org, tglx@...utronix.de
Subject: Re: [PATCH 3/6] perf record: add time-of-day option

On Tue, 2011-03-01 at 08:41 -0700, David Ahern wrote:

> realtime-clock counter is created with a period N. How do you correlate
> perf_clock to time-of-day until now + N? 

You scan fwd? Since its at most N time ahead you're scanning fwd its
still constant time.

Thing is, I'm really not convinced this is a very useful ioctl() in
generic, and ioctl()s really need a good justification to add.

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