On Sun, Apr 08, 2001 at 11:35:36PM +0200, Manfred Spraul wrote:
> I've attached a new patch:
>
> * cpu_is_idle() moved to <linux/pm.h>
> * function uninlined due to header dependencies
> * cpu_is_idle() doesn't call do_softirq directly, instead the caller
> returns to schedule()
> * cpu_is_idle() exported for modules.
> * docu updated.
>
> I'd prefer to inline cpu_is_idle(), but optimizing the idle code path is
> probably not that important ;-)
your cpu_is_idle will return 0 in the need_resched != 0 check even if the cpu
is idle (because of the -1 trick for avoiding the SMP-IPI to notify the cpu).
The issue you are addressing is quite londstanding and it is not only related
to the loop with an idle cpu.
This is the way I prefer to fix it:
ftp://ftp.us.kernel.org/pub/linux/kernel/people/andrea/patches/v2.4/2.4.4pre1/ksoftirqd-1
Andrea
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This archive was generated by hypermail 2b29 : Sun Apr 15 2001 - 21:00:11 EST