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SubjectRe: scheduler ignores need_resched flag in 2.2.x and 2.3.x?
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lk@tantalophile.demon.co.uk (Jamie Lokier) writes:

> Jun Sun wrote:
> > First of all, I think this is must-fix bug. (Any arguments here?)
>
> There are a few other scenarious where need_resched is missed, including
> the last few instructions after ret_from_syscall. And it really does
> happen there. I think it's a must-fix too, but the fact that neither my
> nor Ingo's patch made it in suggests Linus thinks otherwise.

Looks like the easiest way to fix such races would be to move need_resched
back to a global variable (possible in an array indexed per CPU). Earlier
Linux kernels (<2.0) had it this way, I'm not sure why it was changed.


-Andi

--
This is like TV. I don't like TV.

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