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From: Richard Cochran <richardcochran@gmail.com>
To: Andy Lutomirski <luto@amacapital.net>
Cc: linux-kernel@vger.kernel.org, Kumar Sundararajan <kumar@fb.com>,
	john stultz <johnstul@us.ibm.com>, Arun Sharma <asharma@fb.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [RFC 0/2] ABI for clock_gettime_ns
Date: Tue, 13 Dec 2011 04:24:07 +0100	[thread overview]
Message-ID: <20111213032406.GA9604@netboy.at.omicron.at> (raw)
In-Reply-To: <cover.1323739287.git.luto@amacapital.net>

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

  parent reply	other threads:[~2011-12-13  3:24 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-12-13  1:26 Andy Lutomirski
2011-12-13  1:26 ` [RFC 1/2] Add clock_gettime_ns syscall Andy Lutomirski
2011-12-13  3:32   ` Richard Cochran
2011-12-13  1:26 ` [RFC 2/2] x86-64: Add __vdso_clock_gettime_ns vsyscall Andy Lutomirski
2011-12-13  3:24 ` Richard Cochran [this message]
2011-12-13  3:43   ` [RFC 0/2] ABI for clock_gettime_ns john stultz
2011-12-13  7:09     ` Andy Lutomirski
2011-12-14  7:46       ` Richard Cochran
2011-12-14 16:48         ` john stultz
2011-12-14 17:15           ` Andy Lutomirski
2011-12-14 17:31             ` john stultz
2011-12-14 18:37             ` Richard Cochran
2011-12-14 18:30           ` Richard Cochran
2011-12-14 19:07             ` john stultz
2011-12-14 19:20               ` Andy Lutomirski
2011-12-14 21:34                 ` john stultz
2011-12-15 11:35                   ` Richard Cochran
2011-12-22 12:03               ` Richard Cochran
2011-12-24  5:59                 ` Andy Lutomirski
2011-12-24  6:50                   ` Richard Cochran
2011-12-25  4:06                     ` Andy Lutomirski
2011-12-14  7:20     ` Richard Cochran
2011-12-14 16:23       ` john stultz
2011-12-14 18:21         ` Richard Cochran
2011-12-14 18:57           ` john stultz
2012-01-07 19:51             ` Richard Cochran
2011-12-21  0:50 ` Arun Sharma
2011-12-21  1:07   ` Andy Lutomirski

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