linux-kernel - Re: [PATCH] x86-64: Add time to vDSO

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Message-ID: <20110519135336.GI12317@one.firstfloor.org>
Date:	Thu, 19 May 2011 15:53:36 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Andy Lutomirski <luto@....EDU>
Cc:	x86@...nel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] x86-64: Add time to vDSO

On Thu, May 19, 2011 at 09:24:48AM -0400, Andy Lutomirski wrote:
> The only fast implementation of time(2) we expose is through the
> vsyscall page and we want to get userspace to stop using the
> vsyscall page.  So make it available through the vDSO as well.

User space can just use vgettimeofday() and only take the seconds.
Adding time() too was a mistake back then.

And BTW just for seconds alone you wouldn't need the seqlock.

-Andi
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