From: Andi Kleen <andi@firstfloor.org>
To: Andy Lutomirski <luto@MIT.EDU>
Cc: x86@kernel.org, Ingo Molnar <mingo@elte.hu>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org, Andi Kleen <andi@firstfloor.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [PATCH] x86-64: Add time to vDSO
Date: Thu, 19 May 2011 15:53:36 +0200 [thread overview]
Message-ID: <20110519135336.GI12317@one.firstfloor.org> (raw)
In-Reply-To: <8f0d3bec51be8d9a2c37bac5aeb64c35cb387640.1305811184.git.luto@mit.edu>
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
next prev parent reply other threads:[~2011-05-19 13:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-19 13:24 [PATCH] x86-64: Add time to vDSO Andy Lutomirski
2011-05-19 13:53 ` Andi Kleen [this message]
2011-05-19 14:11 ` Andrew Lutomirski
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