On Thu, 19 Mar 2009, Roland McGrath wrote:
> I'm no scheduler expert and I don't know whether the exact placement in
> your change is the optimal one. But it's certainly fine from a ptrace
> perspective.
I'm no scheduler expert either.
Maybe a more generic solution in the scheduler (something like this
totally untested patch) would be better? What say you, scheduler
experts?
Thanks,
Miklos
Index: linux.git/kernel/sched.c
===================================================================
--- linux.git.orig/kernel/sched.c 2009-03-18 12:53:47.000000000 +0100
+++ linux.git/kernel/sched.c 2009-03-20 08:58:13.000000000 +0100
@@ -4629,7 +4629,8 @@ asmlinkage void __sched preempt_schedule
* If there is a non-zero preempt_count or interrupts are disabled,
* we do not want to preempt the current task. Just return..
*/
- if (likely(ti->preempt_count || irqs_disabled()))
+ if (likely(ti->preempt_count || irqs_disabled() ||
+ current->state != TASK_RUNNING))
return;
do {
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