RE: RFC: better timer interface

From	David Laight <David.Laight@ACULAB.COM>
Newsgroups	linux.kernel
Subject	RE: RFC: better timer interface
Date	2017-05-23 15:00 +0200
Message-ID	<tKhzP-3jV-7@gated-at.bofh.it> (permalink)
References	(3 earlier) <tHRgu-1Pj-13@gated-at.bofh.it> <tJCGl-2fH-1@gated-at.bofh.it> <tJDCp-2Pf-13@gated-at.bofh.it> <tKgkp-2A2-3@gated-at.bofh.it> <tKgDM-2HB-9@gated-at.bofh.it>
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From: Thomas Gleixner
> Sent: 23 May 2017 12:59
> On Tue, 23 May 2017, David Laight wrote:
> 
> > From: Thomas Gleixner
> > > Sent: 21 May 2017 19:15
> > ...
> > > > timer_start(timer, ms, abs)
> > >
> > > I'm not even sure, whether we need absolute timer wheel timers at
> > > all, because most use cases are relative to now.
> >
> > Posix requires absolute timers for some userspace calls
> > (annoying because the code often wants relative).
> 
> Posix is completely irrelevant here. These timers are purely kernel
> internal.

Somehow pthread_cond_timedwait() has to be implemented.
Doing so without kernel timers that use absolute 'wall clock' time is tricky.

	David

Thread

RFC: better timer interface Christoph Hellwig <hch@lst.de> - 2017-05-16 13:50 +0200
  [PATCH 3/9] kthread: remove unused macros Christoph Hellwig <hch@lst.de> - 2017-05-16 13:50 +0200
    Re: [PATCH 3/9] kthread: remove unused macros Petr Mladek <pmladek@suse.com> - 2017-05-17 14:20 +0200
      Re: [PATCH 3/9] kthread: remove unused macros Christoph Hellwig <hch@lst.de> - 2017-05-18 10:30 +0200
  [PATCH 8/9] tlclk: switch switchover_timer to a modern timer Christoph Hellwig <hch@lst.de> - 2017-05-16 13:50 +0200
  [PATCH 6/9] s390: switch topology_timer to a modern timer Christoph Hellwig <hch@lst.de> - 2017-05-16 13:50 +0200
  [PATCH 4/9] workqueue: switch to modern timers Christoph Hellwig <hch@lst.de> - 2017-05-16 13:50 +0200
  [PATCH 7/9] s390: switch lgr timer to a modern timer Christoph Hellwig <hch@lst.de> - 2017-05-16 13:50 +0200
  [PATCH 9/9] timers: remove old timer initialization macros Christoph Hellwig <hch@lst.de> - 2017-05-16 13:50 +0200
    Re: [PATCH 9/9] timers: remove old timer initialization macros Arnd Bergmann <arnd@arndb.de> - 2017-05-16 21:50 +0200
      Re: [PATCH 9/9] timers: remove old timer initialization macros Christoph Hellwig <hch@lst.de> - 2017-05-18 10:30 +0200
  [PATCH 2/9] timers: provide a "modern" variant of timers Christoph Hellwig <hch@lst.de> - 2017-05-16 14:00 +0200
    Re: [PATCH 2/9] timers: provide a "modern" variant of timers Randy Dunlap <rdunlap@infradead.org> - 2017-05-16 21:30 +0200
    Re: [PATCH 2/9] timers: provide a "modern" variant of timers Arnd Bergmann <arnd@arndb.de> - 2017-05-16 22:10 +0200
      Re: [PATCH 2/9] timers: provide a "modern" variant of timers Christoph Hellwig <hch@lst.de> - 2017-05-18 10:30 +0200
        Re: [PATCH 2/9] timers: provide a "modern" variant of timers Christoph Hellwig <hch@lst.de> - 2017-05-18 10:50 +0200
          Re: [PATCH 2/9] timers: provide a "modern" variant of timers Arnd Bergmann <arnd@arndb.de> - 2017-05-18 11:00 +0200
            Re: [PATCH 2/9] timers: provide a "modern" variant of timers Christoph Hellwig <hch@lst.de> - 2017-05-21 09:10 +0200
              Re: [PATCH 2/9] timers: provide a "modern" variant of timers Arnd Bergmann <arnd@arndb.de> - 2017-05-21 14:30 +0200
          Re: [PATCH 2/9] timers: provide a "modern" variant of timers Thomas Gleixner <tglx@linutronix.de> - 2017-05-21 20:00 +0200
            Re: [PATCH 2/9] timers: provide a "modern" variant of timers Al Viro <viro@ZenIV.linux.org.uk> - 2017-05-21 20:30 +0200
    RE: [PATCH 2/9] timers: provide a "modern" variant of timers David Laight <David.Laight@ACULAB.COM> - 2017-05-19 12:50 +0200
      Re: [PATCH 2/9] timers: provide a "modern" variant of timers 'Christoph Hellwig' <hch@lst.de> - 2017-05-21 09:00 +0200
  [PATCH 5/9] powerpc/numa: switch topology_timer to modern timer Christoph Hellwig <hch@lst.de> - 2017-05-16 14:00 +0200
  Re: RFC: better timer interface Arnd Bergmann <arnd@arndb.de> - 2017-05-16 17:50 +0200
    Re: RFC: better timer interface Christoph Hellwig <hch@lst.de> - 2017-05-16 18:00 +0200
      Re: RFC: better timer interface Arnd Bergmann <arnd@arndb.de> - 2017-05-16 22:30 +0200
        Re: RFC: better timer interface Christoph Hellwig <hch@lst.de> - 2017-05-18 10:30 +0200
        Re: RFC: better timer interface Thomas Gleixner <tglx@linutronix.de> - 2017-05-21 19:20 +0200
          Re: RFC: better timer interface Thomas Gleixner <tglx@linutronix.de> - 2017-05-21 20:20 +0200
            Re: RFC: better timer interface Arnd Bergmann <arnd@arndb.de> - 2017-05-22 13:30 +0200
              Re: RFC: better timer interface Thomas Gleixner <tglx@linutronix.de> - 2017-05-22 21:30 +0200
            RE: RFC: better timer interface David Laight <David.Laight@ACULAB.COM> - 2017-05-23 13:40 +0200
              RE: RFC: better timer interface Thomas Gleixner <tglx@linutronix.de> - 2017-05-23 14:00 +0200
                RE: RFC: better timer interface David Laight <David.Laight@ACULAB.COM> - 2017-05-23 15:00 +0200
                RE: RFC: better timer interface Thomas Gleixner <tglx@linutronix.de> - 2017-05-23 15:10 +0200
          Re: RFC: better timer interface Arnd Bergmann <arnd@arndb.de> - 2017-05-22 15:40 +0200
            Re: RFC: better timer interface Thomas Gleixner <tglx@linutronix.de> - 2017-05-22 21:20 +0200

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