__do_softirq execution context

Hello netdev,

Please put your thoughts on the following:

__do_softirq could be executed from interrupt, ksoftirqd or event userspace process context. There is a mechanism of limiting userspace employment in that task and waking up the ksoftirqd.

In the case of real-time userspace process, such behavior may yield severe outcomes.
May be it will better not to employ such process at all.  Just check has_rt_policy() and immediately wakeup ksoftirqd?


By now, how network driver poll() could differentiate in which context it runs? Both cases (ksoftirqd and userspace) answer positively on in_interrupt()?

Regards,
- Kostya

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