Re: Idle picture for those interested.

David Brownell
2008-04-04T20:56:42Z

On Friday 04 April 2008, Woodruff, Richard wrote:
> For any interested I'm posting a small snippet of what an ARM-OMAP idle
> looks like.  Having a nice tool can go a long ways.  I'm not sure if the
> picture will make it, but it's worth a try.  Knowing what is out there
> for tools is useful.

Presumably this is from the CPU trace port, OMAP3 with NO_HZ.

Do I read this right: 18 usec tick processing overhead after
receiving an IRQ, before even getting to the generic OMAP GPIO
irq logic (which then has to dispatch to the real IRQ handler)?
Over 5 usec just for updating jiffies64 ...

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