2006-03-14 22:34:29

by Stone, Joshua I

[permalink] [raw]
Subject: RE: [PATCH] provide hrtimer exports for module use [Was: Exportsfor hrtimer APIs]

Thomas Gleixner wrote:
> What means "more for defining intervals" ? Which intervals (period in
> ms)? What are the timers used for ?

The user can write a block of code that they would like to be executed
repeatedly in fixed intervals. A trivial example might look like this:
probe timer.ms(10) { flush_data(); }

This would flush the data every 10ms.

A example of polling might be:
probe timer.ms(1) { log(scheduler_queue_length()); }

I hope this answers your questions...


Josh


2006-03-14 22:48:41

by Thomas Gleixner

[permalink] [raw]
Subject: RE: [PATCH] provide hrtimer exports for module use [Was: Exportsfor hrtimer APIs]

On Tue, 2006-03-14 at 14:34 -0800, Stone, Joshua I wrote:
> Thomas Gleixner wrote:
> > What means "more for defining intervals" ? Which intervals (period in
> > ms)? What are the timers used for ?
>
> The user can write a block of code that they would like to be executed
> repeatedly in fixed intervals. A trivial example might look like this:
> probe timer.ms(10) { flush_data(); }
>
> This would flush the data every 10ms.
>
> A example of polling might be:
> probe timer.ms(1) { log(scheduler_queue_length()); }
>
> I hope this answers your questions...

Not all all.

I have no clue where the block of code written by the user is executed
and why it needs exports. When a user writes code he can use the
existing userpsace interfaces, so why does the module need that
exports ?

tglx