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

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Message-ID: <cfd18e0f0804140521x4a2b97d9h393463b821b380dc@mail.gmail.com>
Date:	Mon, 14 Apr 2008 14:21:27 +0200
From:	"Michael Kerrisk" <mtk.manpages@...glemail.com>
To:	"Erik Bosman" <ejbosman@...vu.nl>
Cc:	"Michael Kerrisk" <mtk.manpages@...il.com>,
	"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, Apr 14, 2008 at 1:59 PM, Erik Bosman <ejbosman@...vu.nl> wrote:
>
>
>
> 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.

Thanks Erik.  Looks good as a first cut -- I may come back to you with
questions.

It sounds like this might go into mainline in 2.6.26, is that right?

Cheers,

Michael
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