Re: [RFC PATCH 0/6] Convert all tasklets to workqueues

[david@lang.hm]

On Fri, 22 Jun 2007, Daniel Walker wrote:

> On Fri, 2007-06-22 at 22:40 +0200, Ingo Molnar wrote:
>
> >  - tasklets have certain fairness limitations. (they are executed in
> >    softirq context and thus preempt everything, even if there is some
> >    potentially more important, high-priority task waiting to be
> >    executed.)
>
> Since -rt has been executing tasklets in process context for a long
> time, I'm not sure this change would cause to many regressions. However,
> it seems like implicit dependencies on "tasklets preempt everything"
> might crop up. The other issue is if they don't "preempt
> everything" (most of the time), what default priority do we give them
> (all of the time)? It seems like Christoph's suggestion of converting
> all the tasklets individually might be a better option, to deal with
> specific pitfalls.

that would be the safe way to do it, but it will take a lot of time and a 
lot of testing.

it's probably better to try the big-bang change and only if you see 
problames go back and break things down.

remember, these changes have been in use in -rt for a while. there's 
reason to believe that they aren't going to cause drastic problems.

David Lang
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