From: Con Kolivas <kernel@kolivas.org>
To: Diego Calleja =?iso-8859-15?q?Garc=EDa?= <diegocg@teleline.es>
Subject: Re: [PATCH] O10int for interactivity
Date: Wed, 30 Jul 2003 11:36:06 +1000
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On Wed, 30 Jul 2003 11:16, Diego Calleja Garc?a wrote:
> El Wed, 30 Jul 2003 00:35:01 +1000 Con Kolivas <kernel@kolivas.org> 
escribi?:
> > That's not as silly as it sounds. In fact it should be dead easy to
> > increase/decrease the amount of anticipatory time based on the bonus from
> > looking at the code. I dunno how the higher filesystem gods feel about
> > this though.
>
> I've done a small patch (one line) which tries to implement that.
> At as-iosched.c:as_add_request() there's:

The logic is in the difference between the dynamic and the static priority to 
determine if a task is interactive. 
current->static_prio - current->prio
will give you a number of -5 to +5, with +5 being a good bonus and vice versa.
however you need to ensure that the value you are fiddling with in the i/o 
scheduler is actually due to the current process[1]

On top of that, the p->prio itself will give you a number of 0-140 depending 
with higher being a lower priority task; numbers 100-140 are for user tasks 
and <100 for real time tasks. 

These all change if you fiddle with the magic in bonus ratios and max rt prio 
etc.

Con

[1] This is why I didn't bother posting my attempts ;)

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