linux-kernel - Re: Using sched_clock for mmio-trace

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Message-ID: <20070217145655.GA15662@one.firstfloor.org>
Date:	Sat, 17 Feb 2007 15:56:55 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	"Frank Ch. Eigler" <fche@...hat.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Jeff Muizelaar <jeff@...idigm.net>,
	linux-kernel@...r.kernel.org
Subject: Re: Using sched_clock for mmio-trace

> This is one of the reasons why we don't just use good old
> do_gettimeofday(), since it takes locks and can lead to lock recursion
> if parts of itself are probed.

do_gettimeofday doesn't take locks.

Only restriction is that you can't single step it with long 
pauses between instructions.

-Andi
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