linux-kernel - Re: [RFC patch 04/15] get_cycles() : powerpc64 HAVE_GET

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Message-Id: <20081016.193310.47274971.davem@davemloft.net>
Date:	Thu, 16 Oct 2008 19:33:11 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mathieu.desnoyers@...ymtl.ca
Cc:	paulus@...ba.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, mingo@...e.hu,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	rostedt@...dmis.org, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	benh@...nel.crashing.org, mingo@...hat.com
Subject: Re: [RFC patch 04/15] get_cycles() : powerpc64 HAVE_GET_CYCLES
 (update)

From: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Date: Thu, 16 Oct 2008 22:08:13 -0400

> * David Miller (davem@...emloft.net) wrote:
> > Date: Thu, 16 Oct 2008 20:43:28 -0400
> > 
> > You'll need to make a similar fix on sparc64.
> 
> I guess you are talking about using sparc64_get_clock_tick rather than
> CLOCK_TICK_RATE ? I assume sparc64_get_clock_tick() done on any CPU will
> return the same rate ?

You'll need to use tb_ticks_per_usec or similar.

The ->get_tick() thing you are using uses a TICK source which is
synchronized across the entire system and advances at a non-changing
rate.

sparc64_get_clock_tick() returns something different.
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