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Date: Sat, 28 Apr 2001 15:55:24 +0200
From: Andi Kleen <ak@suse.de>
To: Ville Herva <vherva@mail.niksula.cs.hut.fi>
Cc: Ingo Molnar <mingo@elte.hu>, Fabio Riccardi <fabio@chromium.com>,
        linux-kernel@vger.kernel.org
Subject: Re: X15 alpha release: as fast as TUX but in user space
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In-Reply-To: <20010428163030.D3682@niksula.cs.hut.fi>; from vherva@niksula.hut.fi on Sat, Apr 28, 2001 at 04:30:30PM +0300
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On Sat, Apr 28, 2001 at 04:30:30PM +0300, Ville Herva wrote:
> Yes, that's vaguely resembles what I had in mind. Of course I had no idea
> about the data structures Tux or X15 use internally, so I couldn't think it
> too thoroughly.

You can also just use the cycle counter directly in most modern CPUs. It can
be read with a single instruction.
In fact modern glibc will do it for you when you use 
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, ...) 

-Andi
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