When to use threaded interrupts?

[Rami Rosen]

Kosta,

Just a wild assumption: maybe the cost of incurring context switches ?
(comparing to tasklets)

Best Regards,
Rami Rosen
http://ramirose.wix.com/ramirosen



On 10 September 2015 at 20:49, Kosta Zertsekel <zertsekel at gmail.com> wrote:
> Hi guys,
>
> I hope I'm on right mailing list. :-)
> I think I get the pro of using threaded interrupts - to decrease the maximum
> interrupt latency on RT workloads and/or RT machines (servers, embedded,
> etc.).
>
> Also, I see that in 4.2 there are only ~76 drivers that use threaded
> interrupt:
> ```
> $ git grep -l IRQ_WAKE_THREAD | sort | grep -v "\.h" | wc -l
> 76
> ```
>
> So, I'd like to ask:
>    - Why not **all** of the drivers use the threaded interrupts?
>    - What are the cons of the threaded interrupts?
>
> Thanks,
> --- KostaZ
>
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