Messages in this thread |  | | | Date | Wed, 29 Dec 1999 16:53:21 +0100 (CET) | | From | Andrea Arcangeli <> | | Subject | Re: [patch] freeing spinlock when UP. |
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On Wed, 29 Dec 1999, Mathijs Mohlmann wrote:
> In both stable and development branches of the kernel, when
That bug has nothing to do with the 2.2.x kernels. It's only a bug inserted with the scheduler changes inserted in 2.3.29.
>happen when the kernels are compiled this __SMP__. Artur Skawina ><skawina@geocities.com> thinks this might delay servicing interrupts >unnecessarily. (thanks Artur for your response).
It's not a performance issue but a stability issue.
The below patch is definitely necessary.
> And here's the patch against 2.3.35-pre6: >--- linux-2.3.35-pre6/kernel/sched.c Fri Dec 10 23:57:11 1999 >+++ linux-2.3.34-post/kernel/sched.c Wed Dec 29 12:34:05 1999 >@@ -273,6 +273,7 @@ > tsk = cpu_curr(this_cpu); > if (preemption_goodness(tsk, p, this_cpu) > 0) > tsk->need_resched = 1; >+ spin_unlock_irqrestore(&runqueue_lock, flags); > #endif > } >
Andrea
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