linux-kernel - RE: RFC: better timer interface

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6DCFFFD977@AcuExch.aculab.com>
Date:   Tue, 23 May 2017 12:51:30 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Thomas Gleixner' <tglx@...utronix.de>
CC:     Arnd Bergmann <arnd@...db.de>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Mark Gross <mark.gross@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Tejun Heo <tj@...nel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Christoph Hellwig <hch@....de>
Subject: RE: RFC: better timer interface

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