Re: [question] why not get rid of handle_softirq from schedule()?

From: Manfred Spraul (manfred@colorfullife.com)
Date: Mon Jun 26 2000 - 13:21:19 EST

kuznet@ms2.inr.ac.ru wrote:
>
> Hello!
>
> > If this is correct, then why do we need to call do_softirq() in
> > schedule() at all - isn't it enough to just call it on every
> > interrupt/syscall return?
>
> OK, let's go further. Why to call it on return from syscall?
>

We would have to check for pending softirq's in local_bh_enable().

* user space
        syscall
* within kernel space:
        spin_lock_bh();
* interrupt arrives
* within interrupt: mark_bh
* interrupt returns, but can't handle softirq now
        ...
        spin_unlock_bh();
        ...
        iretd 

--
	Manfred

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