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Message-ID: <alpine.DEB.1.10.0902090940100.8084@alien.or.mcafeemobile.com>
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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