Re: [RFC/PATCH] posix-timers: make them configurable

From	Thomas Gleixner <tglx@linutronix.de>
Newsgroups	linux.kernel
Subject	Re: [RFC/PATCH] posix-timers: make them configurable
Date	2016-09-09 15:50 +0200
Message-ID	<sfulP-3ra-13@gated-at.bofh.it> (permalink)
References	<sfeTM-2z8-25@gated-at.bofh.it> <sfeTM-2z8-23@gated-at.bofh.it> <sfoJs-8tz-13@gated-at.bofh.it>
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On Fri, 9 Sep 2016, Richard Cochran wrote:

> On Thu, Sep 08, 2016 at 02:19:24PM -0700, John Stultz wrote:
> > Also given many other syscalls take clockids and the backing logic
> > isn't really getting removed (probably could cut the dynamic posix
> > clocks core with the same conditional), I wonder if you could get a
> > similar size win by taking a slightly more narrow cutting of the
> > subsystem. That way you could preserve the more useful clock_gettime()
> > functionality, but maybe stub out some of the less often used
> > functionality.
> 
> I want to support tinification, but I also doubt the utility of
> removing clock_gettime() and clock_nanosleep().  I can't imagine ever
> building a user space without those.  In fact, thinking about IoT,
> having good time is critical, and so these are the *last* functions I
> would remove when downsizing.

gettimeofday() gives you microsecond resolution which is good enough for
99.9% of all problems.

The only real downside is removing clock_nanosleep() because nanosleep()
does not give you the ability to schedule timers on absolute time.

Thanks,

	tglx

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Re: [RFC/PATCH] posix-timers: make them configurable John Stultz <john.stultz@linaro.org> - 2016-09-08 23:20 +0200
  Re: [RFC/PATCH] posix-timers: make them configurable Josh Triplett <josh@joshtriplett.org> - 2016-09-08 23:50 +0200
  Re: [RFC/PATCH] posix-timers: make them configurable Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-09-09 02:00 +0200
    Re: [RFC/PATCH] posix-timers: make them configurable Josh Triplett <josh@joshtriplett.org> - 2016-09-09 02:40 +0200
  Re: [RFC/PATCH] posix-timers: make them configurable Richard Cochran <richardcochran@gmail.com> - 2016-09-09 09:50 +0200
    Re: [RFC/PATCH] posix-timers: make them configurable Josh Triplett <josh@joshtriplett.org> - 2016-09-09 10:10 +0200
      Re: [RFC/PATCH] posix-timers: make them configurable Thomas Gleixner <tglx@linutronix.de> - 2016-09-09 16:00 +0200
    Re: [RFC/PATCH] posix-timers: make them configurable Thomas Gleixner <tglx@linutronix.de> - 2016-09-09 15:50 +0200

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