linux-kernel - Re: itimer again (Re: [PATCH] RTC: Add mmap method to rtc character driver)

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Message-ID: <20060730013936.GA23571@gnuppy.monkey.org>
Date:	Sat, 29 Jul 2006 18:39:36 -0700
From:	Bill Huey (hui) <billh@...ppy.monkey.org>
To:	Nicholas Miell <nmiell@...cast.net>
Cc:	Edgar Toernig <froese@....de>, Neil Horman <nhorman@...driver.com>,
	Jim Gettys <jg@...top.org>, "H. Peter Anvin" <hpa@...or.com>,
	Dave Airlie <airlied@...il.com>,
	Segher Boessenkool <segher@...nel.crashing.org>,
	linux-kernel@...r.kernel.org, a.zummo@...ertech.it,
	jg@...edesktop.org, Keith Packard <keithp@...thp.com>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	"Bill Huey (hui)" <billh@...ppy.monkey.org>
Subject: Re: itimer again (Re: [PATCH] RTC: Add mmap method to rtc character driver)

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

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