Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [PATCH 1/4] Blackfin: arch patch for 2.6.18 | Date | Tue, 26 Sep 2006 11:43:59 +0200 |
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On Tuesday 26 September 2006 05:42, Aubrey wrote: > So, in the kernel space, there is always one bit in the IPEND register > is set. And if there comes a timer interrupt event, in the timer > interrupt handler, there should be two bits set in the IPEND register. > Therefore, schedule happens in the return_from_int. > > So, I still say there is no latency here. >
Well, if that's true, you should change your idle function not to explicitly call schedule().
I haven't really understood how you preempt the idle task, but I guess you can simplify the standard
| while (1) { | while (!need_resched()) | asm("idle"); | schedule(); | }
to
| while (1) | asm("idle");
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