linux-kernel - Re: [RFC 0/2] ABI for clock_gettime

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Message-ID: <20111213032406.GA9604@netboy.at.omicron.at>
Date:	Tue, 13 Dec 2011 04:24:07 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	linux-kernel@...r.kernel.org, Kumar Sundararajan <kumar@...com>,
	john stultz <johnstul@...ibm.com>,
	Arun Sharma <asharma@...com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC 0/2] ABI for clock_gettime_ns

On Mon, Dec 12, 2011 at 05:26:36PM -0800, Andy Lutomirski wrote:
> On x86-64, clock_gettime is so fast that the overhead converting to and
> from nanoseconds is non-negligible.  clock_gettime_ns is a different
> interface that is potentially faster.  If people like the ABI, I'll
> implement an optimized version.

I am not so interested in performance optimizations, but do I think
offering time in nanoseconds is attractive from an application point
of view. The timespec is impractical for everyone.

While you are at it with new syscalls, why not make a clean break from
POSIX and fix the uglies?

- New name, to distance ourselves from POSIX (clock_ns_get?)
- Family of calls, with set/get
- Sub nanosecond field
- TAI time base (or according to parameter?)

Thanks,
Richard
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