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

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Date:	Mon, 14 Apr 2008 13:59:40 +0200 (CEST)
From:	Erik Bosman <ejbosman@...vu.nl>
To:	Michael Kerrisk <mtk.manpages@...il.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.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 Mon, 14 Apr 2008, Michael Kerrisk wrote:

> Erik,
>
> Could you CC me please on kernel-userland API changes.
>
> Also it would be helpful if you could provide a short paragraph
> (plaintext is fine) that describes the new commands and would be
> suitable for inclusion in the prctl.2 (
> http://www.kernel.org/doc/man-pages/online/pages/man2/prctl.2.html )
> man page -- would that be possible?
>
> Cheers,
>
> Michael
>

.TP
.B PR_SET_TSC
(Since Linux 2.6.??, only on x86)
Set the state of the flag determining whether the timestamp counter
can be read by the process. Pass
\fBPR_TSC_ENABLE\fP to \fIarg2\fP to allow it to be read, or
\fBPR_TSC_SIGSEGV\fP to generate a \fBSIGSEGV\fP when the process tries
to read the timestamp counter.
.TP
.B PR_GET_TSC
(Since Linux 2.6.??, only on x86)
Get the state of the flag determining whether the timestamp counter
can be read from \fIarg2\fP.

This is what I would say. I hope it's clear.

Erik
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