linux-kernel - Re: [patch 2/2] timerfd extend clockid support

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Date:	Mon, 9 Feb 2009 09:42:41 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	mtk.manpages@...il.com
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch 2/2] timerfd extend clockid support

On Mon, 9 Feb 2009, Michael Kerrisk wrote:

> On Mon, Feb 9, 2009 at 12:23 PM, Davide Libenzi <davidel@...ilserver.org> wrote:
> > The following patch extends timerfd clockid support to cover the ones
> > supported by timer_create().
> > It exports the invalid_clockid() function outside posix-timers.c to allow
> > timerfd to properly check input parameters.
> > Andrew, this is (eventually) .30 material, and do not take the patch
> > until you have Thomas sign off.
> > Thomas, timerfd uses core hrtimer functions for its tasks. By extending
> > the clockid support, I assume that the clockids other than CLOCK_MONOTONIC
> > and CLOCK_REALTIME, behaves the same from a hrtimer caller POV. Right?
> 
> Hi Davide,
> 
> Have you done any testing of this patch?  My attempts at testing with
> clocks other than REALTIME and MONOTONIC all don't work so far.  In
> some cases, my test programs causes the system to hang.  Try
> experimenting with the (not yet well tested) test program below, to
> check the behavior with other clocks.

Michael, no I did not test it and I did not have even the time to peek 
into the core timer code to see if the usage of other timer types in 
eventfd would create problems. That's why I asked Thomas if they'd behave 
differently from an hrtimer caller POV.
I'll try to take a look by myself today or tomorrow.


- Davide


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