Re: [PATCH] remove interactive credit

[Nick Piggin <nickpiggin@yahoo.com.au>]

Con Kolivas wrote:
> remove interactive credit
> 
> 
> 
> ------------------------------------------------------------------------
> 
> Special casing tasks by interactive credit was helpful for preventing fully
> cpu bound tasks from easily rising to interactive status. 
> 
> However it did not select out tasks that had periods of being fully cpu bound
> and then sleeping while waiting on pipes, signals etc. This led to a more
> disproportionate share of cpu time.
> 
> Backing this out will no longer special case only fully cpu bound tasks, and
> prevents the variable behaviour that occurs at startup before tasks declare
> themseleves interactive or not, and speeds up application startup slightly
> under certain circumstances. It does cost in interactivity slightly as load
> rises but it is worth it for the fairness gains.
> 
> Signed-off-by: Con Kolivas <kernel@kolivas.org>
> 

I'm scared :(

I'm in favour of any attempts to simplify things... but will it be two
months or three before this spontaneously explodes for half our userbase?

Andrew's boss so he gets to decide >:)