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Date: Sat, 29 Jul 2006 18:39:36 -0700
To: Nicholas Miell <nmiell@comcast.net>
Cc: Edgar Toernig <froese@gmx.de>, Neil Horman <nhorman@tuxdriver.com>,
       Jim Gettys <jg@laptop.org>, "H. Peter Anvin" <hpa@zytor.com>,
       Dave Airlie <airlied@gmail.com>,
       Segher Boessenkool <segher@kernel.crashing.org>,
       linux-kernel@vger.kernel.org, a.zummo@towertech.it, jg@freedesktop.org,
       Keith Packard <keithp@keithp.com>, Ingo Molnar <mingo@elte.hu>,
       Steven Rostedt <rostedt@goodmis.org>,
       "Bill Huey (hui)" <billh@gnuppy.monkey.org>
Subject: Re: itimer again (Re: [PATCH] RTC: Add mmap method to rtc character driver)
Message-ID: <20060730013936.GA23571@gnuppy.monkey.org>
References: <44C68AA8.6080702@zytor.com> <1153863542.1230.41.camel@localhost.localdomain> <20060729042820.GA16133@gnuppy.monkey.org> <20060729125427.GA6669@localhost.localdomain> <20060729204107.GA20890@gnuppy.monkey.org> <20060729234948.0768dbf4.froese@gmx.de> <20060729225138.GA22390@gnuppy.monkey.org> <1154216151.2467.5.camel@entropy> <20060730010020.GA23288@gnuppy.monkey.org> <1154222579.2467.12.camel@entropy>
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From: Bill Huey (hui) <billh@gnuppy.monkey.org>
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On Sat, Jul 29, 2006 at 06:22:59PM -0700, Nicholas Miell wrote:
> On Sat, 2006-07-29 at 18:00 -0700, Bill Huey wrote:
> > Think edge triggered verse level triggered. Event interfaces in the Linux
> > kernel are sort of just that, edge triggered events. What RT folks generally
> > want is control over scheduling policies over a particular time period in
> > relation to a scheduling policy. A general kernel event interface isn't
>                 ^ Did you mean to say timer here?

No, I really ment scheduling.

> > going to cut it for those purpose and wasn't design to deal with those cases
> > in the first place.
> 
> So you're asking for an automatic (perhaps temporary) change in
> scheduling policy when a particular timer expires (or perhaps on
> occurrence of other types of events)?

> I think Windows automatically boosts the priority of a thread when it
> delivers an I/O completion notification, and I'm pretty sure that
> Microsoft has a patent related to that.

Na, different problem altogether. It's better that'd shut up.

bill