linux-kernel - Re: [PATCH 2/3] x86: Implement prctl PR_GET_TSC and PR_SET

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Message-ID: <alpine.DEB.1.10.0804261612430.6108@twinlark.arctic.org>
Date:	Sat, 26 Apr 2008 16:14:22 -0700 (PDT)
From:	dean gaudet <dean@...tic.org>
To:	"H. Peter Anvin" <hpa@...or.com>
cc:	Erik Bosman <ejbosman@...vu.nl>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Andrea Arcangeli <andrea@...share.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH 2/3] x86: Implement prctl PR_GET_TSC and PR_SET_TSC

On Sat, 26 Apr 2008, H. Peter Anvin wrote:

> dean gaudet wrote:
> > 
> > i might be too late... but shouldn't these #defines be PR_SET_RDTSC and
> > PR_GET_RDTSC or something like that?
> > 
> > to me calling them PR_SET_TSC/PR_GET_TSC just seem like alternative ways to
> > change/get the TSC (and could even reduce to portable TSC implementations...
> > since such registers do exist on other architectures).
> > 
> 
> I would argue no, the flag is "is the TSC available".  RDTSC is an
> x86-specific name and would map poorly onto other architectures.

yeah but "SET TSC" to me reads as "set the TSC".... i read nothing about 
making some instruction available or not.

although clock_gettime/clock_settime could more natural APIs for such 
things.

-dean
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