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

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Message-ID: <4813BED5.7070000@zytor.com>
Date:	Sat, 26 Apr 2008 16:46:29 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	dean gaudet <dean@...tic.org>
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

dean gaudet wrote:
> 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.
> 

PR_SET/PR_GET are the common prefixes, though.

	-hpa
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